Sterling Trucks Acterra MX User's Manual

ACTERRA MAINTENANCE MANUAL
Models: MX
STI-403-1 (10/07P)
Published by
Freightliner LLC
4747 N. Channel Ave.
Portland, OR 97217
Printed in U.S.A.
Foreword
When performed on a regular basis, lubricating the parts of your vehicle is the least costly way
of obtaining safe and reliable vehicle operation. Added benefits and savings occur when you
check that the engine, undercarriage, and noise emission control parts are in good working order
during lubrication.
This maintenance manual explains when you should lubricate parts and what to look for when
checking for wear or damage. For daily and weekly checks, refer to the vehicle driver’s manual.
IMPORTANT: Descriptions and specifications in this manual were in effect at the time of
printing. Sterling Truck Corporation reserves the right to discontinue models and to
change specifications or design at any time without notice and without incurring
obligation. Descriptions and specifications contained in this publication provide no
warranty, expressed or implied, and are subject to revision and editions without notice.
For additional information, please contact Freightliner LLC, Service Systems and Documentation, P.O. Box 3849, Portland, OR 97208-3849, U.S.A. or refer to www.Freightliner.com and
www.SterlingTrucks.com.
Environmental Concerns and Recommendations
Whenever you see instructions in this manual to discard materials, you should attempt to reclaim
and recycle them. To preserve our environment, follow appropriate environmental rules and
regulations when disposing of materials.
NOTICE: Parts Replacement Considerations
Do not replace suspension, axle, or steering parts (such as springs, wheels, hubs, and steering
gears) with used parts. Used parts may have been subjected to collisions or improper use and
have undetected structural damage.
© 2000-2007 Freightliner LLC
All rights reserved. No part of this publication, in whole or in part, may be translated, reproduced,
stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical,
photocopying, recording, or otherwise, without the prior written permission of Freightliner LLC.
Freightliner LLC
Service Systems and Documentation (POC-SSD)
P.O. Box 3849
Portland, OR 97208–3849
Introduction
Descriptions of Service Publications
Freightliner LLC distributes the following major service publications.
Workshop Manual
Workshop manuals contain service and repair information for all vehicle systems and components, except for major components such as engines, transmissions, and rear axles. Each workshop manual section is divided into subjects
that can include general information, principles of operation, removal, disassembly, assembly, installation, specifications, and troubleshooting.
Maintenance Manual
Maintenance manuals contain routine maintenance procedures and intervals for
vehicle components and systems. They have information such as lubrication
procedures and tables, fluid replacement procedures, fluid capacities, specifications, procedures for adjustments and for checking the tightness of fasteners.
Maintenance manuals do not contain detailed repair or service information.
Driver’s Manual
Driver’s manuals contain information needed to enhance the driver’s understanding of how to operate and care for the vehicle and its components. Each
manual contains a chapter that covers pretrip inspection and daily maintenance
of vehicle components. Driver’s manuals do not contain detailed repair or service information.
Parts Technical Manual
Freightliner LLC publishes this manual to aid in the identification of serviceable
replacement vehicle parts. This manual is used in conjunction with the parts
book and the service parts catalog microfiche.
Service Bulletins
Service bulletins provide the latest service tips, field repairs, product improvements, and related information. Some service bulletins are updates to information in the workshop manual. These bulletins take precedence over workshop
manual information, until the latter is updated; at that time, the bulletin is usually
canceled. The service bulletins manual is available only to dealers. When doing
service work on a vehicle system or part, check for a valid service bulletin for
the latest information on the subject.
IMPORTANT: Before using a particular service bulletin, check the current
service bulletin validity list to be sure the bulletin is valid.
Recall Bulletins
These bulletins pertain to special situations that involve service work or replacement of parts in connection with a recall notice. Recall bulletins pertain to matters of vehicle safety. All bulletins are distributed to dealers; customers receive
notices that apply to their vehicles.
Field Service
Modifications
This publication is concerned with non-safety-related service work or replacement of parts. All field service modifications are distributed to dealers; customers receive notices that apply to their vehicles.
Acterra Maintenance Manual, January 2003
I–1
Introduction
Page Description
For a page example of the printed manual, see Fig. 1.
A
B
C
31
Frame and Fifth Wheel
31−01 Frame Fastener Torque
Checking
CAUTION:
31−02 Fifth Wheel Inspecting and
Lubricating
HOLLAND
FONTANE
Acterra Trucks Maintenance Manual, April 2000
D
31/1
E
f020103
02/11/2002
A.
B.
C.
D.
E.
Maintenance Operation Number consists of the Group Number followed by the Sequence Number
Group Title
Group Number
Release Date
Group Number/Page Number
Fig. 1, Page Example of the Printed Manual
I–2
Acterra Maintenance Manual, January 2003
Introduction
Maintenance Manual Contents
Group No.
Group Title
00 . . . . . . . . . . . . . . . . . . . . . . General Information
01 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine
09 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air Intake
13 . . . . . . . . . . . . . . . . . . . . . . . . . Air Compressor
15 . . . . . . . . . . . . . . . . . . . Alternators and Starters
20 . . . . . . . . . . . . . . . . . . . Engine Cooling/Radiator
25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clutch
26 . . . . . . . . . . . . . . . . . . . . . . . . . . . Transmission
31 . . . . . . . . . . . . . Frame and Frame Components
32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . Suspension
33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Axle
35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rear Axle
40 . . . . . . . . . . . . . . . . . . . . . . . . Wheels and Tires
41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Driveline
42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Brakes
46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steering
47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel
49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Exhaust
54 . . . . . . . . . . Electrical, Instruments, and Controls
72 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Doors
83 . . . . . . . . . . . . . . . . . Heater and Air Conditioner
Acterra Maintenance Manual, January 2003
I–3
General Information
00
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Initial Maintenance (IM) Operations Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–09
Lubrication and Fluid Level Check (M1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–15
Lubrication and Fluid Level Check (M2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–16
M1 Maintenance Interval Operations Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–10
M2 Maintenance Interval Operations Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–11
M3 Maintenance Interval Operations Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–12
M4 Maintenance Interval Operations Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–13
M5 Maintenance Interval Operations Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–14
Maintenance Interval Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–07
Maintenance Operation Sets Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–08
Maintenance Schedule Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–06
Metric/U.S. Customary Conversion Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–04
Noise Emission Control Systems Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–01
Scheduled Maintenance Intervals, Description and Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–05
Torque Specifications Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–03
Verification of Inspections Log. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00–02
Acterra Maintenance Manual, January 2007
00
General Information
Noise Emission Control Systems Maintenance: 00–01
General Information
Federal Law, Part 205:
Transportation Equipment Noise
Emission Controls
Part 205, Transportation Equipment Noise Emission
Controls, requires the vehicle manufacturer to furnish, with each new vehicle, such written instructions
for the proper maintenance, use, and repair of the
vehicle by the ultimate purchaser to provide reasonable assurance of the elimination or minimization of
noise emission degradation throughout the life of the
vehicle. In compliance with the law, the Noise Emission Control Systems maintenance located in each
applicable group within this manual, in conjunction
with the vehicle workshop manual, provides these
instructions to owners.
Normal Vehicle Use
The maintenance instructions contained in this
manual are based on average vehicle use and normal operating conditions. Unusual vehicle operating
conditions may require service at more frequent intervals.
Recommendations for
Replacement Parts
Replacement parts used for maintenance or for the
repair of noise emission control systems should be
genuine Sterling parts. If other than genuine Sterling
parts are used for replacements or for the repair of
components affecting noise emission control, the
owner should be sure that such parts are warranted
by their manufacturer to be equivalent to genuine
Sterling parts in performance and durability.
Sterling Noise Emissions
Warranty
Tampering With the Noise
Control System Is Prohibited
Federal law prohibits the following acts or the causing thereof: (1) the removal or rendering inoperative
by any person other than for purposes of maintenance, repair, or replacement, of any device or element of design incorporated into any new vehicle for
the purpose of noise control prior to its sale or delivery to the ultimate purchaser or while it is in use, or
(2) the use of the vehicle after such device or element of design has been removed or rendered inoperative by any person. Among those acts presumed
to constitute tampering are the acts listed below:
A. Removal of engine noise-deadening panels.
B. Removal of or rendering the engine speed governor inoperative so as to allow engine speed to
exceed manufacturer’s specifications.
C. Removal of or rendering inoperative the fan
clutch, including by-passing the control on any
thermostatic fan drive to cause it to operate continuously.
D. Removal of the fan shroud.
E. Removal of or rendering inoperative exhaust system components, including exhaust pipe clamping.
F.
Removal of air intake system components.
G. Removal of hood liners (noise-deadening panels).
Maintenance Instructions
Scheduled intervals are in the maintenance tables in
Group 00 of this manual. A "Verification of Inspections Log" is contained in the following table, and
should be filled in each time the noise emission controls on the vehicle are maintained or repaired.
See the vehicle owner’s warranty information book
for warranty information concerning noise emission
control systems.
Acterra Maintenance Manual, January 2007
00/1
00
General Information
Verification of Inspections Log: 00–02
Verification of Inspections Log
Verification of Inspections Log — Group 20
Verification of Inspections Log — Group 20 — Engine Cooling/Radiator
Date
Mileage
Repair Description
Cost
Repair Facility
Verification of Inspections Log — Group 49
Verification of Inspections Log — Group 49 — Exhaust
Date
00/2
Mileage
Repair Description
Cost
Repair Facility
Acterra Maintenance Manual, January 2007
00
General Information
Torque Specifications Tables: 00–03
Torque Values for U.S. Customary Thread Fasteners With Lubricated* or Plated Threads†
Regular Hex
Thread
Diameter–
Pitch
Grade 5
Bolt
Grade 5 or
B Nut
Torque: lbf·ft (N·m)
f230003
f230002
Flanged
Grade 8 or
8.2 Bolt
Grade 8 or
C Nut
Torque: lbf·ft (N·m)
f230004
f230005
Grade 5
Bolt
Grade B
Nut
Torque: lbf·ft (N·m)
f230006
f230007
Grade 8 or
8.2 Bolt
Grade G
Nut
Torque: lbf·ft (N·m)
f230009
f230008
1/4–20
7 (9)
8 (11)
6 (8)
10 (14)
1/4–28
8 (11)
9 (12)
7 (9)
12 (16)
5/16–18
15 (20)
16 (22)
13 (18)
21 (28)
5/16–24
16 (22)
17 (23)
14 (19)
23 (31)
3/8–16
26 (35)
28 (38)
23 (31)
37 (50)
3/8–24
30 (41)
32 (43)
25 (34)
42 (57)
7/16–14
42 (57)
45 (61)
35 (47)
60 (81)
7/16–20
47 (64)
50 (68)
40 (54)
66 (89)
1/2–13
64 (87)
68 (92)
55 (75)
91 (123)
1/2–20
72 (98)
77 (104)
65 (88)
102 (138)
9/16–12
92 (125)
98 (133)
80 (108)
130 (176)
9/16–18
103 (140)
110 (149)
90 (122)
146 (198)
5/8–11
128 (173)
136 (184)
110 (149)
180 (244)
5/8–18
145 (197)
154 (209)
130 (176)
204 (277)
3/4–10
226 (306)
241 (327)
200 (271)
320 (434)
3/4–16
253 (343)
269 (365)
220 (298)
357 (484)
7/8–9
365 (495)
388 (526)
320 (434)
515 (698)
7/8–14
402 (545)
427 (579)
350 (475)
568 (770)
1–8
—
582 (789)
—
—
1–12
—
637 (863)
—
—
1–14
—
652 (884)
—
—
* Sterling recommends that all plated and unplated fasteners be coated with oil before installation.
† Use these torque values if either the bolt or nut is lubricated or plated (zinc-phosphate conversion-coated, cadmium-plated, or waxed).
Table 1, Torque Values for U.S. Customary Thread Fasteners With Lubricated or Plated Threads
Acterra Maintenance Manual, January 2007
00/3
00
General Information
Torque Specifications Tables: 00–03
Torque Values for U.S. Customary Thread Fasteners With Dry (Unlubricated)* Plain (Unplated) Threads†
Regular Hex
Thread
Diameter–Pitch
Grade 5 Bolt
Grade 5 or B
Nut
Torque: lbf·ft (N·m)
Grade 8 or C
Nut
Torque: lbf·ft (N·m)
f230003
f230002
Flanged
Grade 8 or 8.2
Bolt
f230004
Grade 8 or 8.2
Bolt
Grade G Nut
Torque: lbf·ft (N·m)
f230005
f230009
f230008
1/4–20
8 (11)
10 (14)
—
1/4–28
9 (12)
12 (16)
—
5/16–18
15 (20)
22 (30)
22 (30)
5/16–24
17 (23)
25 (34)
—
3/8–16
28 (38)
40 (54)
40 (54)
3/8–24
31 (42)
45 (61)
—
7/16–14
45 (61)
65 (88)
65 (88)
7/16–20
50 (68)
70 (95)
—
1/2–13
70 (95)
95 (129)
95 (129)
1/2–20
75 (102)
110 (149)
—
9/16–12
100 (136)
140 (190)
140 (190)
9/16–18
110 (149)
155 (210)
—
5/8–11
135 (183)
190 (258)
190 (258)
5/8–18
155 (210)
215 (292)
—
3/4–10
240 (325)
340 (461)
340 (461)
3/4–16
270 (366)
380 (515)
—
7/8–9
385 (522)
540 (732)
—
7/8–14
425 (576)
600 (813)
—
1–8
580 (786)
820 (1112)
—
1–12
635 (861)
900 (1220)
—
1–14
650 (881)
915 (1241)
—
* Threads may have residual oil, but will be dry to the touch.
† Male and female threads (bolt and nut) must both be unlubricated and unplated; if either is plated or lubricated, use Table 1. Sterling recommends that all
plated and unplated fasteners be coated with oil before installation.
Table 2, Torque Values for U.S. Customary Thread Fasteners With Dry (Unlubricated) Plain (Unplated) Threads
00/4
Acterra Maintenance Manual, January 2007
00
General Information
Torque Specifications Tables: 00–03
Torque Values for Metric Thread Fasteners With Lubricated* or Plated Threads†
Class 8.8 Bolt
Class 8 Nut
Thread
Diameter–Pitch
Torque: lbf·ft (N·m)
8.8
Class 10 Nut
Torque: lbf·ft (N·m)
10.9
8
f230010
Class 10.9 Bolt
f230011
10
f230012
f230013
M6
5 (7)
7 (9)
M8
12 (16)
17 (23)
M8 x 1
13 (18)
18 (24)
M10
24 (33)
34 (46)
M10 x 1.25
27 (37)
38 (52)
M12
42 (57)
60 (81)
M12 x 1.5
43 (58)
62 (84)
M14
66 (89)
95 (129)
M14 x 1.5
72 (98)
103 (140)
M16
103 (140)
148 (201)
M16 x 1.5
110 (149)
157 (213)
M18
147 (199)
203 (275)
M18 x 1.5
165 (224)
229 (310)
M20
208 (282)
288 (390)
M20 x 1.5
213 (313)
320 (434)
M22
283 (384)
392 (531)
M22 x 1.5
315 (427)
431 (584)
M24
360 (488)
498 (675)
M24 x 2
392 (531)
542 (735)
M27
527 (715)
729 (988)
M27 x 2
569 (771)
788 (1068)
M30
715 (969)
990 (1342)
M30 x 2
792 (1074)
1096 (1486)
* Sterling recommends that all plated and unplated fasteners be coated with oil before installation.
† Use these torque values if either the bolt or nut is lubricated or plated (zinc-phosphate conversion-coated,
cadmium-plated, or waxed).
Table 3, Torque Values for Metric Thread Fasteners With Lubricated or Plated
Threads
Acterra Maintenance Manual, January 2007
00/5
00
General Information
Metric/U.S. Customary Conversion Tables: 00–04
When You Know U.S.
Customary
Multiply
By
To Get Metric
When You
Know Metric
Multiply
By
To Get U.S. Customary
Length
inches (in)
25.4
millimeters (mm)
0.03937
inches (in)
inches (in)
2.54
centimeters (cm)
0.3937
inches (in)
feet (ft)
0.3048
meters (m)
3.281
feet (ft)
yards (yd)
0.9144
meters (m)
1.094
yards (yd)
miles (mi)
1.609
kilometers (km)
0.6215
miles (mi)
square inches (in2)
645.16
square millimeters (mm2)
0.00155
square inches (in2)
square inches (in2)
6.452
square centimeters (cm2)
0.155
square inches (in2)
square feet (ft2)
0.0929
square meters (m2)
10.764
cubic inches (in3)
16387.0
cubic millimeter (mm3)
0.000061
cubic inches (in3)
cubic inches (in3)
16.387
cubic centimeters (cm3)
0.06102
cubic inches (in3)
cubic inches (in3)
0.01639
liters (L)
61.024
cubic inches (in3)
fluid ounces (fl oz)
29.54
milliliters (mL)
0.03381
pints (pt)
0.47318
liters (L)
2.1134
pints (pt)
quarts (qt)
0.94635
liters (L)
1.0567
quarts (qt)
Area
square feet (ft2)
Volume
fluid ounces (fl oz)
gallons (gal)
3.7854
liters (L)
0.2642
cubic feet (ft3)
28.317
liters (L)
0.03531
cubic feet (ft3)
gallons (gal)
cubic feet (ft3)
0.02832
cubic meters (m3)
35.315
cubic feet (ft3)
Weight/Force
ounces (av) (oz)
28.35
grams (g)
0.03527
ounces (av) (oz)
pounds (av) (lb)
0.454
kilograms (kg)
2.205
pounds (av) (lb)
U.S. tons (t)
907.18
kilograms (kg)
0.001102
U.S. tons (t)
U.S. tons (t)
0.90718
metric tons (t)
1.1023
U.S. tons (t)
Torque/Work Force
inch–pounds (lbf·in)
11.298
Newton–centimeters (N·cm)
0.08851
inch–pounds (lbf·in)
foot–pounds (lbf·ft)
1.3558
Newton–meters (N·m)
0.7376
foot–pounds (lbf·ft)
3.37685
kilo Pascals (kPa)
0.29613
inches of mercury (inHg)
kilo Pascals (kPa)
0.14503
pounds per square inch (psi)
Pressure/Vacuum
inches of mercury (inHg)
pounds per square inch (psi) 6.895
Table 4, Metric/U.S. Customary Conversion
When You Know
Subtract
Then
Divide By
degrees Fahrenheit (°F)
32
1.8
To Get
When You
Know
degrees Celsius (°C)
Multiply
By
Then
Add
To Get
1.8
32
degrees Fahrenheit (°F)
Table 5, Temperature Conversion
00/6
Acterra Maintenance Manual, January 2007
00
General Information
Scheduled Maintenance Intervals, Description and
Use: 00–05
Description
Use
Schedule I (severe service) applies to vehicles that
annually travel up to 6000 miles (10 000 kilometers)
or that operate under severe conditions. Examples of
Schedule I usage include: operation on extremely
poor roads or where there is heavy dust accumulation; constant exposure to extreme hot, cold, salt-air,
or other extreme climates; frequent short-distance
travel; construction-site operation; city operation (fire
truck, garbage truck); or farm operation.
Before placing your new vehicle in service, determine
the correct maintenance intervals that apply to your
intended use of the vehicle. Refer to the Maintenance Schedule Table to determine the distance (or
hour) interval at which each Maintenance Operation
Set must be performed to comply with your vehicle’s
schedule. For Schedule I vehicles equipped with an
hourmeter, use hours to determine maintenance intervals, rather than distance traveled.
Schedule II (short-haul transport) applies to vehicles
that annually travel up to 60,000 miles (100 000 kilometers) and operate under normal conditions. Examples of Schedule II usage are: operation primarily
in cities and densely populated areas; local transport
with infrequent freeway travel; or high percentage of
stop-and-go travel.
When the vehicle reaches the actual distance (or
hours) given for an interval, refer to the Maintenance
Interval Tables to find the Maintenance Operation Set
that applies to that interval. Then perform the maintenance operations listed in the applicable Maintenance Interval Operation Table. Use the maintenance
operation reference numbers to find instructions in
the manualfor completion of each operation.
Schedule III (long-haul transport) is for vehicles that
annually travel more than 60,000 miles (100 000 kilometers), with minimal city or stop-and-go operation.
Examples of Schedule III usage are: regional delivery
that is mostly freeway miles; interstate transport; or
any road operation with high annual mileage.
The table under Maintenance Schedule Table
shows three different schedules of vehicle usage. For
each schedule the appropriate distance interval is
given for performing Initial Maintenance and for repeating each maintenance operation set (M1 through
M5). For Schedule I, the appropriate time interval is
also given.
The tables under Maintenance Interval Tables show
which maintenance operation set must be performed
at the actual distances (miles and kilometers) for
each maintenance schedule (or the actual hours of
operation for Schedule I). The schedule of actual distances (and hours) is based on the intervals given in
the Maintenance Schedule Table.
The tables under Maintenance Operation Sets
Tables list, in numerical order, the text reference
numbers and descriptions of all maintenance operations, and indicates all maintenance operation sets at
which each operation must be performed.
Complete each Maintenance Operation Set at the
required interval. Then, when you have completed
Maintenance Operation Set M5 under the 32nd Maintenance Number listed in the Maintenance Interval
Table, repeat the pattern. The 33rd Maintenance
Number will begin at Maintenance Operation Set M1,
under the 1st Maintenance Number listed in the
Maintenance Interval Table.
NOTE: When performing operations for the 33rd
Maintenance Number, complete the M1 operations only, not the Initial Maintenance operations.
To determine the distance/hours for the 33rd Maintenance Number, add your schedule’s distance/hours
for the 1st Maintenance Number to the
distance/hours for the 32nd Maintenance Number,
then perform the operations listed in the applicable
table in the Maintenance Operations Tables. For the
34th Maintenance Number, add the distance/hours
for the 2nd to the distance/hours for the 32nd; continue this pattern for each successive Maintenance
Number.
Each Maintenance Interval Operations Table (IM
through M5) lists the appropriate text reference
numbers and descriptions of only those maintenance
operations that must be performed at that maintenance operation set. Each maintenance operation set
is listed in a separate Maintenance Operations Table.
Acterra Maintenance Manual, January 2007
00/7
00
General Information
Maintenance Schedule Table: 00–06
Maintenance Intervals
Maintenance Schedule
Models
Maintenance Interval
Operation
Frequency
Miles
Km
Hours
Schedule I
(Severe Service)
vehicles that annually travel up
to 6000 miles (10 000 km)
All
Initial Maintenance (IM)
first
1000
1600
100
Maintenance 1 (M1)
every
1000
1600
100
Maintenance 2 (M2)
every
4000
6400
400
Maintenance 3 (M3)
every
8000
12 800
800
Maintenance 4 (M4)
every
16,000
25 600
1600
Maintenance 5 (M5)
every
32,000
51 200
3200
Schedule II
(Short-Haul Transport)
vehicles that annually travel up
to 60,000 miles (100 000 km)
Schedule III
(Long-Haul Transport)
vehicles that annually travel
over 60,000 miles (100 000
km)
All
All
Initial Maintenance (IM)
first
8000
12 000
Maintenance 1 (M1)
every
8000
12 000
Maintenance 2 (M2)
every
16,000
24 000
Maintenance 3 (M3)
every
32,000
48 000
Maintenance 4 (M4)
every
64,000
96 000
Maintenance 5 (M5)
every
128,000
192 000
Initial Maintenance (IM)
first
10,000
16 000
Maintenance 1 (M1)
every
10,000
16 000
Maintenance 2 (M2)
every
20,000
32 000
Maintenance 3 (M3)
every
40,000
64 000
Maintenance 4 (M4)
every
80,000
128 000
Maintenance 5 (M5)
every
160,000
256 000
—
—
Table 6, Maintenance Schedule Table
00/8
Acterra Maintenance Manual, January 2007
00
General Information
Maintenance Interval Tables: 00–07
Maintenance Intervals for Schedule I
Maint. No.
Maintenance Interval
Miles
km
Hours
1
IM and M1
1000
1600
100
2
M1
2000
3200
200
3
M1
3000
4800
300
4
M1and M2
4000
6400
400
5
M1
5000
8000
500
6
M1
6000
9600
600
7
M1
7000
11 200
700
8
M1, M2, and M3
8000
12 800
800
9
M1
9000
14 400
900
10
M1
10,000
16 000
1000
11
M1
11,000
17 600
1100
12
M1 and M2
12,000
19 200
1200
13
M1
13,000
20 800
1300
14
M1
14,000
22 400
1400
15
M1
15,000
24 000
1500
16
M1, M2, M3, and M4
16,000
25 600
1600
17
M1
17,000
27 200
1700
18
M1
18,000
28 800
1800
19
M1
19,000
30 400
1900
20
M1 and M2
20,000
32 000
2000
21
M1
21,000
33 600
2100
22
M1
22,000
35 200
2200
23
M1
23,000
36 800
2300
24
M1, M2, and M3
24,000
38 400
2400
25
M1
25,000
40 000
2500
26
M1
26,000
41 600
2600
27
M1
27,000
43 200
2700
28
M1 and M2
28,000
44 800
2800
29
M1
29,000
46 400
2900
30
M1
30,000
48 000
3000
31
M1
31,000
49 600
3100
32
M1, M2, M3, M4, and M5
32,000
51 200
3200
Table 7, Maintenance Intervals for Schedule I
Acterra Maintenance Manual, January 2007
00/9
00
General Information
Maintenance Interval Tables: 00–07
Maintenance Intervals for Schedules II and III (all models)
Schedule II
Schedule III
Maint.
No.
Maintenance Interval
1
IM and M1
2
M1 and M2
16,000
24 000
20,000
32 000
3
M1
24,000
36 000
30,000
48 000
4
M1, M2, and M3
32,000
48 000
40,000
64 000
5
M1
40,000
60 000
50,000
80 000
6
M1 and M2
48,000
72 000
60,000
96 000
7
M1
56,000
84 000
70,000
112 000
8
M1, M2, M3, and M4
64,000
96 000
80,000
128 000
9
M1
72,000
108 000
90,000
144 000
10
M1 and M2
80,000
120 000
100,000
160 000
11
M1
88,000
132 000
110,000
176 000
12
M1, M2, and M3
96,000
144 000
120,000
192 000
13
M1
104,000
156 000
130,000
208 000
14
M1, and M2
112,000
168 000
140,000
224 000
15
M1
120,000
180 000
150,000
240 000
16
M1, M2, M3, M4, and M5
128,000
192 000
160,000
256 000
17
M1
136,000
204 000
170,000
272 000
18
M1 and M2
144,000
216 000
180,000
288 000
19
M1
152,000
228 000
190,000
304 000
20
M1, M2, and M3
160,000
240 000
200,000
320 000
21
M1
168,000
252 000
210,000
336 000
22
M1 and M2
176,000
264 000
220,000
352 000
23
M1
184,000
276 000
230,000
368 000
24
M1, M2, M3, and M4
192,000
288 000
240,000
384 000
25
M1
200,000
300 000
250,000
400 000
26
M1 and M2
208,000
312 000
260,000
416 000
27
M1
216,000
324 000
270,000
432 000
28
M1, M2, and M3
224,000
336,000
280,000
448 000
29
M1
232,000
348 000
290,000
464 000
30
M1 and M2
240,000
360 000
300,000
480 000
31
M1
248,000
372 000
310,000
496 000
32
M1, M2, M3, M4, and M5
256,000
384 000
320,000
512 000
Miles
km
Miles
km
8000
12 000
10,000
16 000
Table 8, Maintenance Intervals for Schedules II and III (all models)
00/10
Acterra Maintenance Manual, January 2007
00
General Information
Maintenance Operation Sets Tables: 00–08
IMPORTANT: At each Maintenance Operation Set, in
addition to the maintenance operations listed in this
table, perform all daily, weekly, and monthly maintenance operations listed in the "Pretrip and Post-trip
Inspections and Maintenance" chapter of the
Acterra® Driver’s Manual.
NOTE: Maintenance operations appearing in italics in
this table are for noise emission control components.
Numbers in this table are maintenance operation reference numbers matching those in the text of this
manual.
Maintenance Operation Sets for Groups 00 through 32
REQUIRED MAINTENANCE OPERATION SET
IM M1 M2 M3 M4 M5
Maintenance Operation Number and Operation Description
00–15
Lubrication and Fluid Level Check
00–16
Lubrication and Fluid Level Check
01–01
Engine-Support Fasteners Checking
01–02
Engine Drive Belt Inspecting
01–03
Pacbrake Inspecting and Maintenance*
09–01
Air Cleaner Element Inspecting and Replacing
13–01
Air Compressor Inspecting, Bendix
13–02
Air Compressor Rebuilding/Replacing, Bendix
15–01
Alternator, Battery, and Starter Checking
20–01
Radiator Cap Checking
20–02
Radiator Pressure Flushing and Coolant Changing
20–03
Fan Clutch Checking
25–01
Clutch Release Bearing and Release Cross-Shaft Lubricating
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
25–02
Clutch (Pull-Type) Inspecting and Adjusting
•
25–03
Hydraulic Fluid Level Checking
•
25–04
Hydraulic Fluid Replacing
26–01
Manual Transmission Fluid Level Checking
26–02
Eaton Fuller and TTC Transmission Fluid Changing and Magnetic Plug Cleaning
26–03
Allison, Eaton Fuller, and Meritor Transmission Breather Checking
26–04
Allison Transmission Fluid and Filter Changing
26–05
Mercedes-Benz Transmission Fluid Changing and Magnetic Plug Cleaning
•
26–06
Mercedes-Benz Transmission Leak Checking
•
31–01
Frame Fastener Torque Checking
•
31–02
Fifth Wheel Inspecting
•
•
•
•
•
•†
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
31–03
Fifth Wheel Lubricating
•
•
•
•
•
•
32–01
Suspension Inspecting
•
•
•
•
•
•
32–02
Suspension Lubricating
•
•
•
•
•
•
Acterra Maintenance Manual, January 2007
00/11
00
General Information
Maintenance Operation Sets Tables: 00–08
Maintenance Operation Sets for Groups 00 through 32
REQUIRED MAINTENANCE OPERATION SET
IM M1 M2 M3 M4 M5
Maintenance Operation Number and Operation Description
32–03
U-Bolt Torque Checking
•
•
•
•
* With frequent use, the Pacbrake Exhaust Brake will operate free of maintenance. However, if the vehicle is used inconsistently, seasonally, or is exposed to
excess moisture, it will be necessary to perform preventative maintenance as instructed in Maintenance Operation 01–03.
† IM interval does not apply to vehicles with a factory fill of Eaton approved synthetic lubricant.
Table 9, Maintenance Operation Sets for Groups 00 through 32
Maintenance Operation Sets for Groups 33 through 42
REQUIRED MAINTENANCE OPERATION SET
IM M1 M2 M3 M4 M5
Maintenance Operation Number and Operation Description
33–01
Knuckle Pin Lubricating
•
•
•
•
•
•
33–02
Tie-Rod End Inspecting
•
•
•
•
•
•
33–03
Tie-Rod End Lubricating
•
•
•
•
•
•
33–04
All-Axle Alignment Checking
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
33–05
All-Wheel-Drive Front Axle Oil Level Checking
33–06
All-Wheel-Drive Front Axle Oil Changing
33–07
Draw Key Nut Inspecting
35–01
Axle Lubricant Level Checking
•
•
•
•
•
•
•
•
•
35–02
Axle Breather Checking
•
35–03
Axle Lubricant Changing and Magnetic Plug Cleaning
•
35–04
Two-Speed-Axle Shift Unit Oil Level Checking
•
35–05
Two-Speed-Axle Shift Unit Oil Changing
40–01
Wheel Nut Checking
•
•
•
41–01
Driveline Inspecting
•
•
•
•
•
•
41–02
Driveline Lubricating
•
•
•
•
•
•
42–01
Air Dryer Inspecting, Bendix AD–9
•
•
•
•
•
•
•
•
42–02
Air Brake Valve Inspecting and Leak Checking, Bendix BP–R1
•
•
•
•
•
•
42–03
Foot Brake Valve Actuator Lubricating, Bendix E–8P
•
•
•
•
•
•
42–04
Air Brake Valve Operation Checking
•
•
•
•
•
•
42–05
Relay Valve Checking, Midland
•
•
•
•
•
•
42–06
Quick Release and Flipper Valves Checking, Midland
•
•
•
•
•
•
42–07
Brake Chamber Inspecting (All Models)
•
•
•
•
•
•
42–08
Camshaft Bracket Bushing Lubricating
•
•
•
•
42–09
Automatic Slack Adjuster Checking, Meritor
•
•
•
•
•
•
42–10
Automatic Slack Adjuster Lubricating, Meritor
•
•
•
•
•
•
42–11
Automatic Slack Adjuster Inspecting, Meritor
•
•
•
•
42–12
Air Dryer Checking, Bendix AD–9
•
•
•
00/12
Acterra Maintenance Manual, January 2007
00
General Information
Maintenance Operation Sets Tables: 00–08
Maintenance Operation Sets for Groups 33 through 42
REQUIRED MAINTENANCE OPERATION SET
IM M1 M2 M3 M4 M5
Maintenance Operation Number and Operation Description
42–13
Air Dryer Desiccant Replacing, Bendix AD–9
•
42–14
Air Brake Valve Leak Checking, Bendix TC–6
42–15
Air Reservoir Automatic Drain Valve Disassembly, Cleaning, Inspecting, and
Lubricating, Bendix DV–2
•
•
•
•
•
•
•
•
•
•
42–16
Air Brake Valve Disassembly, Cleaning, and Inspecting, Bendix E–8P, R–12, R–14,
SR–1, ST–3, TC–6, and TP–3DC
42–17
Brake Lining Wear Checking, Hydraulic Disc Brakes
•
•
•
•
•
•
•
42–18
Brake Lines Checking, Hydraulic Disc Brakes
•
•
•
•
•
•
42–19
Power Booster Checking, Bendix Hydro-Max®
•
•
•
•
•
•
42–20
Automatic Slack Adjuster Lubricating, Gunite
•
•
•
•
•
•
42–21
Automatic Slack Adjuster Inspecting, Gunite
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
42–22
Automatic Slack Adjuster Lubricating, Haldex
42–23
Bosch Rail-Slide Hydraulic Brake Caliper Lubricating
42–24
Brake Inspection
•
•
Table 10, Maintenance Operation Sets for Groups 33 through 42
Maintenance Operation Sets for Groups 46 through 83
REQUIRED MAINTENANCE OPERATION SET
IM M1 M2 M3 M4 M5
Maintenance Operation Number and Operation Description
46–01
Steering Driveline Lubricating
•
•
•
•
46–02
Drag Link Lubricating
•
•
•
•
•
•
46–03
Power Steering Reservoir Fluid Level Checking
•
•
•
•
46–04
Power Steering Reservoir Fluid and Filter Changing
•
•
•
•
•
•
•
•
•
•
•
•
•
•
46–05
Power Steering Gear Lubricating
47–01
Fuel Tank Draining and Vent Checking
•
•
•
49–01
Exhaust System Inspecting
54–01
Electrical System Checking
54–02
Coolant Level Sensor Cleaning
72–01
Weatherstrip, Door Latch, and Door Hinge Lubricating
•
•
•
•
•
•
83–01
Air Conditioner Inspecting
•
•
•
•
•
•
83–02
HVAC Air Filter Replacing*
•
•
* Replace the HVAC filter every 6 months regardless of mileage.
Table 11, Maintenance Operation Sets for Groups 46 through 83
Acterra Maintenance Manual, January 2007
00/13
00
General Information
Initial Maintenance (IM) Operations Table: 00–09
IMPORTANT: After performing all operations in this
table, perform all daily and weekly maintenance operations listed in the "Pretrip Inspection and Daily
Maintenance" chapter of the vehicle driver’s manual.
Also, perform all M1 Maintenance Interval Operations
at the Initial Maintenance (IM).
NOTE: Numbers in this table are maintenance operation reference numbers matching those in the text of
this manual. The Initial Maintenance consists of all
M1 Operations plus the other operations listed below.
Initial Maintenance (IM) Operations
Maint.
Oper. No.
Initial Maintenance (IM) Operations
00–10
Perform All M1 Operations
25–02
Clutch (Pull-Type) Inspecting and Adjusting
26–02
Eaton Fuller and TTC Transmission Fluid Changing and Magnetic Plug
Cleaning*
31–01
Frame Fastener Torque Checking
32–03
U-Bolt Torque Checking
33–04
All-Axle Alignment Checking
33–07
Draw Key Nut Inspecting
35–03
Axle Lubricant Changing and Magnetic Plug Cleaning
35–04
Two-Speed-Axle Shift Unit Oil Level Checking
* IM interval does not apply to vehicles with a factory fill of Eaton approved synthetic lubricant.
00/14
Acterra Maintenance Manual, January 2007
00
General Information
M1 Maintenance Interval Operations Table: 00–10
IMPORTANT: After performing all operations listed in
this table, perform all daily, weekly, and monthly
maintenance operations listed in the "Pretrip and
Post-Trip Inspections and Maintenance" chapter of
the Acterra® Driver’s Manual.
NOTE: Numbers in this table are maintenance operation reference numbers matching those in the text of
this manual.
M1 Maintenance Interval Operations
Maint.
Oper. No.
00–15
M1 Maintenance Interval Operations
Lubrication and Fluid Level Check:
• Clutch Release Bearing and Release Cross-Shaft Lubricating
• Hydraulic Fluid Level Checking
• Manual Transmission Fluid Level Checking
• Fifth Wheel Lubricating
• Suspension Lubricating
• Knuckle Pin Lubricating
• Tie-Rod End Lubricating
• All-Wheel-Drive Front Axle Oil Level Checking
• Axle Lubricant Level Checking
• Driveline Lubricating
• Foot Brake Valve Actuator Lubricating, Bendix E–8P
• Automatic Slack Adjuster Lubricating, Meritor
• Automatic Slack Adjuster Lubricating, Gunite
• Automatic Slack Adjuster Lubricating, Haldex
• Drag Link Lubricating
• Power Steering Reservoir Fluid Level Checking
• Power Steering Gear Lubricating (Ross TAS Series)
• Weatherstrip, Door Latch, and Door Hinge Lubricating
31–02
Fifth Wheel Inspecting
32–01
Suspension Inspecting
33–02
Tie-Rod End Inspecting
35–02
Axle Breather Checking
41–01
Driveline Inspecting
42–01
Air Dryer Inspecting, Bendix AD–9
42–02
Air Brake Valve Inspecting and Leak Checking, Bendix BP–R1
42–04
Air Brake Valve Operation Checking
42–05
Relay Valve Checking, Midland
42–06
Quick Release and Flipper Valves Checking, Midland
42–07
Brake Chamber Inspecting (All Models)
42–09
Automatic Slack Adjuster Checking, Meritor
Acterra Maintenance Manual, January 2007
00/15
00
General Information
M1 Maintenance Interval Operations Table: 00–10
Maint.
Oper. No.
00/16
M1 Maintenance Interval Operations
42–14
Air Brake Valve Leak Checking, Bendix TC–6
42–17
Brake Lining Wear Checking, Hydraulic Disc Brakes
42–18
Brake Lines Checking, Hydraulic Disc Brakes
42–19
Power Booster Checking, Bendix Hydro-Max®
42–21
Automatic Slack Adjuster Inspecting, Gunite
42–24
Brake Inspection
83–01
Air Conditioner Inspecting
Acterra Maintenance Manual, January 2007
00
General Information
M2 Maintenance Interval Operations Table: 00–11
IMPORTANT: After performing all operations listed in
this table, perform all daily, weekly, and monthly
maintenance operations listed in the "Pretrip and
Post-Trip Inspections and Maintenance" chapter of
the Acterra® Driver’s Manual. Also, perform all M1
Maintenance Interval Operations at the M2 Maintenance Interval.
NOTE: Maintenance operations appearing in italics in
this table are for noise emission control components.
Numbers in this table are maintenance operation reference numbers matching those in the text of this
manual. The M2 Maintenance consists of all M1 Interval Operations plus the other operations listed
below.
M2 Maintenance Interval Operations
Maint.
Oper. No.
M2 Maintenance Interval Operations
00–10
Perform All M1 Operations
00–16
Lubrication and Fluid Level Check:
• Two-Speed-Axle Shift Unit Oil Level Checking
• Camshaft Bracket Bushing Lubricating
• Air Reservoir Automatic Drain Valve Disassembly, Cleaning, Inspecting, and Lubricating, Bendix DV–2
• Bosch Rail-Slide Hydraulic Brake Caliper Lubricating
• Steering Driveline Lubricating
13–01
Air Compressor Inspecting, Bendix
20–01
Radiator Cap Checking
20–03
Fan Clutch Checking
26–03
Allison, Eaton/Fuller, and Meritor Transmission Breather Checking
42–11
Automatic Slack Adjuster Inspecting, Meritor
49–01
Exhaust System Inspecting
83–02
HVAC Air Filter Replacing*
* Replace the HVAC filter every 6 months regardless of mileage.
Acterra Maintenance Manual, January 2007
00/17
00
General Information
M3 Maintenance Interval Operations Table: 00–12
IMPORTANT: After performing all operations listed in
this table, perform all daily, weekly, and monthly
maintenance operations listed in the "Pretrip and
Post-Trip Inspections and Maintenance" chapter of
the Acterra® Driver’s Manual. Also, perform all M1
and M2 Maintenance Interval Operations at the M3
Maintenance Interval.
NOTE: Numbers in this table are maintenance operation reference numbers matching those in the text of
this manual. The M3 Maintenance consists of all M1
and M2 Interval Operations plus the other operations
listed below.
M3 Maintenance Interval Operations
Maint.
Oper. No.
00/18
M3 Maintenance Interval Operations
00–10
Perform All M1 Operations
00–11
Perform All M2 Operations
01–02
Engine Drive Belt Inspecting
09–01
Air Cleaner Element Inspecting and Replacing
25–02
Clutch (Pull-Type) Inspecting and Adjusting
26–04
Allison Transmission Fluid and Filter Changing
32–03
U-Bolt Torque Checking
33–06
All-Wheel-Drive Front Axle Oil Changing
33–07
Draw Key Nut Inspecting
35–05
Two-Speed-Axle Shift Unit Oil Changing
40–01
Wheel Nut Checking
42–12
Air Dryer Checking, Bendix AD–9
47–01
Fuel Tank Draining and Vent Checking
54–01
Electrical System Checking
Acterra Maintenance Manual, January 2007
00
General Information
M4 Maintenance Interval Operations Table: 00–13
IMPORTANT: After performing all operations listed in
this table, perform all daily, weekly, and monthly
maintenance operations listed in the "Pretrip and
Post-Trip Inspections and Maintenance" chapter of
the Acterra® Driver’s Manual. Also, perform all M1,
M2, and M3 Maintenance Interval Operations at the
M4 Maintenance Interval.
NOTE: Maintenance operations appearing in italics in
this table are for noise emission control components.
Numbers in this table are maintenance operation reference numbers matching those in the text of this
manual. The M4 Maintenance consists of all M1, M2,
and M3 Interval Operations plus the other operations
listed below.
M4 Maintenance Interval Operations
Maint.
Oper. No.
M4 Maintenance Interval Operations
00–10
Perform All M1 Operations
00–11
Perform All M2 Operations
00–12
Perform All M3 Operations
01–01
Engine-Support Fasteners Checking
15–01
Alternator, Battery, and Starter Checking
20–02
Radiator Pressure Flushing and Coolant Changing
26–02
Eaton Fuller and TTC Transmission Fluid Changing and Magnetic Plug
Cleaning
31–01
Frame Fastener Torque Checking
33–04
All-Axle Alignment Checking
35–03
Axle Lubricant Changing and Magnetic Plug Cleaning
46–04
Power Steering Reservoir Fluid and Filter Changing
Acterra Maintenance Manual, January 2007
00/19
00
General Information
M5 Maintenance Interval Operations Table: 00–14
IMPORTANT: After performing all operations listed in
this table, perform all daily, weekly, and monthly
maintenance operations listed in the "Pretrip and
Post-Trip Inspections and Maintenance" chapter of
the Acterra® Driver’s Manual. Also, perform all M1,
M2, M3, and M4 Maintenance Interval Operations at
the M5 Maintenance Interval.
NOTE: Numbers in this table are maintenance operation reference numbers matching those in the text of
this manual. The M5 Maintenance consists of all M1,
M2, M3, and M4 Interval Operations plus the other
operations listed below.
M5 Maintenance Interval Operations
Maint.
Oper. No.
00/20
M5 Maintenance Interval Operations
00–10
Perform All M1 Operations
00–11
Perform All M2 Operations
00–12
Perform All M3 Operations
00–13
Perform All M4 Operations
13–02
Air Compressor Rebuilding/Replacing, Bendix
25–04
Hydraulic Fluid Replacing
26–05
Mercedes-Benz Transmission Fluid Changing and Magnetic Plug Cleaning
26–06
Mercedes-Benz Transmission Leak Checking
42–13
Air Dryer Desiccant Replacing, Bendix AD–9
42–16
Air Brake Valve Disassembly, Cleaning, and Inspecting, Bendix E–8P,
R–12, R–14, SR–1, ST–3, TC–6, and TP–3DC
54–02
Coolant Level Sensor Cleaning
Acterra Maintenance Manual, January 2007
00
General Information
Lubrication and Fluid Level Check (M1): 00–15
Maintenance Operation 00–15 (see Table 12), summarizes all Lubrication and Fluid Level Check operations that must be performed at the M1 Maintenance
Interval for Schedules I, II, and III
Maintenance operation numbers given in the table
are reference numbers used to help you find detailed
instructions in the manual on the lubrication or fluid
check.
Maintenance Operation 00–15
M1 Lubrication and Fluid Level Check
Maint.
Oper. No.
Operation Description
25–01
Clutch Release Bearing and Release Cross-Shaft Lubricating
25–03
Hydraulic Fluid Level Checking
26–01
Manual Transmission Fluid Level Checking
31–03
Fifth Wheel Lubricating
32–02
Suspension Lubricating
33–01
Knuckle Pin Lubricating
33–03
Tie-Rod End Lubricating
33–05
All-Wheel-Drive Front Axle Oil Level Checking
35–01
Axle Lubricant Level Checking
41–02
Driveline Lubricating
42–03
Foot Brake Valve Actuator Lubricating, Bendix E–8P
42–10
Automatic Slack Adjuster Lubricating, Meritor
42–20
Automatic Slack Adjuster Lubricating, Gunite
42–22
Automatic Slack Adjuster Lubricating, Haldex
46–02
Drag Link Lubricating
46–03
Power Steering Reservoir Fluid Level Checking
46–05
Power Steering Gear Lubricating
72–01
Weatherstrip, Door Latch, and Door Hinge Lubricating
Table 12, Maintenance Operation 00-15, M1 Lubrication and Fluid Level Check
Acterra Maintenance Manual, January 2007
00/21
00
General Information
Lubrication and Fluid Level Check (M2): 00–16
Maintenance Operation 00–16 (see Table 13), summarizes all Lubrication and Fluid Level Check operations that must be performed at the M2 Maintenance
Interval for Schedules I, II, and III
Maintenance operation numbers given in the table
are reference numbers used to help you find detailed
instructions in the manual on the lubrication or fluid
check.
Maintenance Operation 00–16
M2 Lubrication and Fluid Level Check
Maint.
Oper. No.
Operation Description
35–04
Two-Speed-Axle Shift Unit Oil Level Checking
42–08
Camshaft Bracket Bushing Lubricating
42–15
Air Reservoir Automatic Drain Valve Disassembly, Cleaning, Inspecting,
and Lubricating, Bendix DV–2
42–23
Bosch Rail-Slide Hydraulic Brake Caliper Lubricating
46–01
Steering Driveline Lubricating
Table 13, Maintenance Operation 00-16, M2 Lubrication and Fluid Level Check
00/22
Acterra Maintenance Manual, January 2007
Engine
01
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Engine Drive Belt Inspecting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–02
Engine-Support Fasteners Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–01
Pacbrake Inspecting and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03
Acterra Maintenance Manual, January 2007
01
Engine
01–01 Engine-Support
Fasteners Checking
Front and rear engine supports for vehicles built from
January 2007 require no periodic maintenance.
Mounts should be inspected when the engine is removed for service. For vehicles manufactured prior to
January 2007, perform the following check.
Check the rear engine-support fasteners (see Fig. 1,
Ref. 4) for tightness. Tighten the 3/4-inch fasteners
215 to 265 lbf·ft (292 to 359 N·m).
Check the front engine-support fasteners for tightness. Tighten the 5/8-inch fasteners 125 lbf·ft (170
N·m).
NOTE: At engine overhaul, and whenever the
engine has been removed, inspect the lower
and upper isolators (Refs. 1 and 6), and replace
them if they are worn. See Group 01 of the
Acterra® Workshop Manual for instructions.
2
6
Belt Condition Inspection
1. Inspect the belt for glazing. See Fig. 2, Ref. A.
Glazing is represented by shiny sidewalls, and is
caused by friction created when a loose belt slips
in the pulleys. It can also be caused by oil or
grease contamination on the pulleys.
2. Check the belt for ply separation. See Fig. 2,
Ref. B. Oil, grease, or belt dressing can cause
the belt to fall apart in layers. Repair any oil or
coolant leaks that are affecting the belts before
replacing the drive belts. Do not use belt dressing on any belt.
3. Check the belt for a jagged or streaked sidewall.
See Fig. 2, Ref. C. Jagged or streaked sidewalls
are the result of foreign objects, such as sand or
gravel in the pulley, or a rough pulley surface.
1
5
cessive and premature belt wear. Poly-V belts, or
serpentine belts, are retained by a belt tensioner that
requires no tension adjustment. Replace the engine
drive belt if any conditions described in the visual
description are found. V-belts are installed as individual belts, and as matched sets. When replacing a
matched set of belts, always replace both belts at the
same time. Matched belts must be from the same
manufacturer. To inspect a belt, gently twist the belt
to view the belt sidewalls and bottom. Inspect all
drive belts for the following conditions, then perform
the belt tension inspection.
4
4. Check for tensile breaks (breaks in the cord
body). See Fig. 2, Ref. D. Cuts in a belt are usually caused by foreign objects in the pulley, or by
prying or forcing the belt during removal or installation.
2
3
10/05/94
f220047a
1. Lower Isolator
2. Engine Support
Washer
3. 3/4–10 Capscrew
4. 3/4–10 Hexnut
5. Engine Mount
6. Upper Isolator
Fig. 1, Engine Rear Mount
5. Check for uneven ribs on serpentine (poly-V)
belts. See Fig. 2, Ref. E. Foreign objects in the
pulley will erode the undercord ribs, causing the
belt to lose its gripping power.
6. Check the drive belts for cracks. See Fig. 2, Ref.
F. Small irregular cracks are usually the signs of
an old belt.
01–02 Engine Drive Belt
Inspecting
7. Inspect the pulleys for excessive play or wobble.
Excessive play or wobble indicates a failure of
the pulley bearing. Check for belt squealing or
squeaking. Replace the bearings as necessary.
Worn or loose drive belts may cause premature
bearing failure or engine overheating. Excessive tension, or too little tension on the belt may result in ex-
NOTE: If it is difficult to distinguish the location
of a supposed bearing noise, obtain a stethoscope and place it on the component being
Acterra Maintenance Manual, January 2007
01/1
01
Engine
A
D
B
E
C
F
11/21/94
A. Glazing
B. Separating Layers
C. Streaked Sidewalls
f150010a
D. Tensile Break
E. Uneven Ribs
F. Cracks
Fig. 2, Drive Belt Replacement Conditions
checked, not the pulley, to isolate the area from
outside interference.
8. Inspect all pulleys for foreign objects, oil, or
grease in the grooves.
Belt Tension Inspection
NOTE: If engine drive belts require adjustment,
see Group 01 of the Acterra® Workshop Manual
for instructions.
Threaded-Adjustment Type
1. Apply the parking brakes, and chock the tires to
prevent the vehicle from moving.
2. Install a belt tension gauge at the center of the
belt’s longest free-span. Check belt tension. See
Table 1 for belt tension specifications.
Spring-Tension Type
On belts equipped with a spring tensioner, the belt
tension is automatically adjusted. Check that the tensioner is holding tension on the belt by inserting the
end of a breaker bar in the 1/2-inch square hole on
the forward face of the tensioner, and rotating the
tensioner down, away from the belt. When the
breaker bar is slowly released, the tensioner should
return to its original position. If not, see Group 01 of
the Acterra® Workshop Manual for replacement
instructions.
NOTE: Caterpillar engines are provided with
automatic drive belt tensioners. The following
engines, which appear in Table 1, are provided
with automatic tensioners for the fan and alternator belts.
3. If belt tension is not correct, see Group 01 of the
Acterra® Workshop Manual to adjust belt tension.
01/2
Acterra Maintenance Manual, January 2007
01
Engine
Engine
Cummins ISB, ISC, ISM
Mercedes-Benz MBE900
Component
Refrigerant Compressor
Belt Tension:
lbf (kg)
100 (45)
Fan and Alternator
29.5 (27.9)
Refrigerant Compressor
30.0 (28.4)
Table 1, Drive Belt Tensions
01–03 Pacbrake Inspecting and
Maintenance
With frequent use, the Pacbrake Exhaust Brake will
operate maintenance-free. If the vehicle is used inconsistently or seasonally, it will be necessary to perform preventative maintenance. If the vehicle is exposed to excess moisture, or is used only for
periodical or seasonal use, perform the following
steps:
1. With the engine off, use any oil-free or nonpetroleum based high-heat lubricant, and spray
or coat a sufficient amount on the restricter valve
shaft and the attaching locations at each end of
the actuation cylinder.
2. With your hands or a pair of pliers, motion the
valve several times to distribute the lubricant
down the shaft and the attaching locations.
NOTE: Operation of the Pacbrake could be affected by starting the engine and idling for short
periods of time. During a cold engine start-up,
moisture occurs in the engine and the exhaust
system that creates a corrosion hazard. The
brake housing may trap water in the valve shaft
bore causing corrosion resulting in an improper
or non-functioning brake. If it is necessary to
periodically start the engine, attain normal operating temperatures before shutting down the engine.
Acterra Maintenance Manual, January 2007
01/3
Air Intake
09
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Air Cleaner Element Inspecting and Replacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 09–01
Acterra Maintenance Manual, February 2004
Air Intake
09
09–01 Air Cleaner Element
Inspecting and
Replacing
Method 1
Replace the air cleaner element at the recommended
interval or when the air restriction indicator reaches
22 inH2O on a vehicle with an MBE engine, or 25
inH2O on a vehicle with a Caterpillar or Cummins
engine, if equipped with an air restriction indicator.
For replacement instructions, see Group 09 of the
Acterra® Workshop Manual. Reset the air restriction
indicator.
If the maximum restriction is not reached, record the
air restriction value. If the value is higher than the
previous recording, reset the air restriction indicator.
If the value is lower than the previous recording, inspect the air cleaner and air cleaner element of
cracks, leaks, or any other damage.
If the air cleaner or air cleaner element is damaged,
replace it and reset the air restriction indicator.
Method 2
Replace the air cleaner element at the recommended
interval or when the air restriction indicator reaches
22 inH2O on a vehicle with an MBE engine, or 25
inH2O on a vehicle with a Caterpillar or Cummins
engine, if equipped with an air restriction indicator.
For replacement instructions, see Group 09 of the
Acterra® Workshop Manual. Reset the air restriction
indicator.
If the maximum restriction is not reached, inspect the
air cleaner and air cleaner element for cracks, leaks,
or any other damage. If the air cleaner or air cleaner
element is damaged, replace it and reset the air restriction indicator.
Acterra Maintenance Manual, February 2004
09/1
Air Compressor
13
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Air Compressor Inspecting, Bendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–01
Air Compressor Rebuilding/Replacing, Bendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13–02
Acterra Maintenance Manual, March 2000
Air Compressor
13
13–01 Air Compressor
Inspecting, Bendix
Inspect the air intake line, oil supply and return lines,
and coolant supply and return hoses for tight connections and general condition. Tighten the connections,
and replace the lines and hoses, as needed. If the
compressor air-intake adapter is loose, remove the
adapter, replace its gaskets, and securely install it.
Check the cooling fins on the compressor crankcase.
Clean the fins if they are clogged with debris.
13–02 Air Compressor
Rebuilding/Replacing,
Bendix
Disassemble, clean, and inspect the air compressor.
Replace all seals, gaskets, springs, and all parts that
are worn or damaged beyond re-use. Replace the air
compressor unloader mechanism components. Use
only genuine Bendix replacement parts or kits. Test
the operation of the unloader mechanism. See
Group 13 of the Acterra® Workshop Manual for rebuild (or replacement) instructions and test operations.
NOTE: Bendix factory-rebuilt air compressors
are available from authorized Bendix distributors, and carry a new compressor warranty.
Acterra Maintenance Manual, March 2000
13/1
Alternators and Starters
15
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Alternator, Battery, and Starter Connections Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15–01
Acterra Maintenance Manual, January 2006
15
Alternators and Starters
15–01 Alternator, Battery, and
Starter Connections
Checking
4.2
Inspect the retainer assembly (or battery
hold-downs) and the battery box. Replace
worn or damaged parts. Remove any corrosion with a wire brush, and wash with a
weak solution of baking soda and water.
Rinse with clean water, and dry. Paint the
retainer assembly, if needed, to prevent
rusting.
Batteries generate explosive gas as a by-product
of their chemical process. Do not smoke when
working around batteries. Put out all flames and
remove any source of sparks or intense heat in
the vicinity of the battery compartment. Make sure
the battery compartment has been completely
vented before disconnecting or connecting the
battery cables.
4.3
Check that foreign objects, such as
stones, bolts, and nuts are removed from
the battery box.
4.4
After cleaning, connect the cables to the
batteries, and tighten them to the torque
specifications listed on the battery, generally 10 to 15 lbf·ft (14 to 20 N·m).
Battery acid is extremely harmful if splashed in
the eyes or on the skin. Always wear a face shield
and protective clothing when working around
batteries.
4.5
Spray each connection with dielectric red
enamel and coat the battery terminals
with dielectric grease; see Table 1.
WARNING
1. Check the tightness of the alternator bracket fasteners; tighten the fasteners as needed. For
torque values, see Group 15 of the Acterra®
Workshop Manual.
2. Check the belt tension of the alternator drive
belt. Use a tension gauge at the belt’s widest
span, and adjust the belt tension if needed. See
Group 01 for belt tension specifications. Some
Caterpillar engines are equipped with dual alternator belts; always check both belts for correct
tension. Check that the tensioner operates
smoothly without binding. Engines equipped with
a serpentine, or poly-V belt have automatic belt
tensioners and do not require belt tension inspection.
3. Check that all electrical connections at the alternator and starter are clean. Clean and tighten all
charging system electrical connections, including
the connections at the starter B terminal and
ground terminal, and where the alternator charging cable terminates.
Approved Dielectric Protectants
Protectant Material
Dielectric Grease
Dielectric Red Enamel
Spray-On Application
Dielectric Red Enamel
Brush-On Application
Approved Brand
Lubriplate FLP DS–ES
3M 1602 IVI-Spray Sealer; order
from the PDC
Spray-On B–6–665
Gyptal 1201EW-Low VOC, Red;
order at www.glyptal.com or
1-800-GLP-1201
Table 1, Approved Dielectric Protectants
5. Check the alternator wiring for missing insulation,
kinks, and heat damage. Replace or repair as
needed.
6. Check the terminals on the battery shut-off
switch and the magnetic switch. Make sure the
terminal connections are clean and tight. Coat
the terminal connections with dielectric red
enamel after cleaning.
4. Inspect the battery cables for wear, and replace
as needed. Clean the cable connector terminals
with a wire brush. See Group 54 of the Acterra®
Workshop Manual for troubleshooting instructions, and for adjustment, repair, or replacement
instructions.
4.1
Clean and tighten the battery ground
cable, terminal, and clamps.
Acterra Maintenance Manual, January 2006
15/1
Engine Cooling/Radiator
20
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Fan Clutch Checking (Noise Emission Control) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–03
Radiator Cap Checking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–01
Radiator Pressure Flushing and Coolant Changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20–02
Acterra Maintenance Manual, January 2007
20
Engine Cooling/Radiator
20–01 Radiator Cap Checking
WARNING
Do not remove or loosen the radiator cap until the
engine and cooling system have completely
cooled. Use extreme care when removing the cap.
A sudden release of pressure from removing the
cap prior to the system cooling can result in a
surge of scalding coolant that could cause serious personal injury.
20–02 Radiator Pressure
Flushing and Coolant
Changing
NOTE: For additional instructions on cleaning
and flushing the cooling system, see the engine
manufacturer’s maintenance and operation
manual.
1. Drain the radiator.
1.1
Remove the surge tank cap. See Fig. 1.
CAUTION
The radiator cap currently installed may not be the
same one installed when the vehicle was built. If
the radiator cap must be replaced, make sure that
it is the correct cap for the cooling system of the
vehicle. Because the radiator cap pressure rating
affects the operating temperature of the engine,
installing an improperly rated radiator cap may
have adverse effects on the cooling system, and
engine operating temperatures. This could cause
premature engine wear or damage.
1. Using a radiator-cap tester, check the pressure
cap to see if it maintains pressure to within 10%
of the pressure rating marked on the cap. If it
doesn’t, replace the cap. Make sure that the replacement radiator cap is correctly rated for the
cooling system of the vehicle.
2. There is a second valve in the radiator cap that
opens under vacuum. This prevents the collapse
of hoses and other parts that are not internally
supported when the system cools. Inspect the
vacuum-relief valve to be sure it is not stuck.
3. Make sure that the cap seals properly on the
coolant filler neck seat, and that the radiator cap
gasket is not damaged. On vehicles with screw
on caps with O-rings, make sure that the O-ring
is not cracked or deteriorated. Replace the cap if
the gasket shows deterioration or damage.
1
f500107a
11/19/94
1. Surge Tank
Fig. 1, Surge Tank and Cap
1.2
Open the petcock at the bottom of the
radiator to drain the engine coolant. See
Fig. 2.
2. Disconnect the radiator inlet and outlet hose connections.
3. Flush the radiator.
3.1
Attach a flushing gun nozzle to the radiator outlet.
3.2
Run water in until the radiator is full.
3.3
Apply no more than 20 psi (138 kPa) air
pressure intermittently to help dislodge
sediment buildup in the core.
CAUTION
When flushing the radiator, do not apply more
than 20 psi (138 kPa) air pressure. Excessive pressure can damage the radiator or heater core.
Acterra Maintenance Manual, January 2007
20/1
20
Engine Cooling/Radiator
1
f200326
02/28/96
2
Fig. 3, T-Bolt Type Hose Clamp
A
11/19/94
B
1
f500108a
1. Radiator
2. Horn
Fig. 2, Draining The Engine Coolant
4. Drain the radiator, and flush the radiator until
clean water flows from the radiator. Remove the
flushing gun.
5. Close the petcock at the bottom of the radiator.
6. Connect the hoses. Your hose clamps can be
either T-bolt clamps (see Fig. 3) or Breeze
Constant-Torque clamps (see Fig. 4).
Tighten T-bolt type hose clamps 55 lbf·in (620
N·cm). These clamps are now standard on hoses
with an inside diameter greater than 2 inches (51
mm).
Breeze Constant-Torque hose clamps must be
tightened to the correct torque. The screw tip of
the clamp must extend about 1/4 inch (6 mm)
from the clamp housing, and the belleville
washer stacks must be collapsed almost flat.
Use a torque wrench to install these clamps.
Correct installation torque is as follows:
For Breeze Constant-Torque hose clamps with a
5/16-inch tightening screw hex: 55 lbf·in (620
N·cm).
For Breeze Constant-Torque hose clamps with a
3/8-inch tightening screw hex: 90 lbf·in (1020
N·cm).
20/2
08/15/94
f200286
A. The screw tip must extend about 1/4 inch (6 mm).
B. The belleville washer stacks must be collapsed
almost flat.
1. Tightening Screw Hex
Fig. 4, Breeze Constant-Torque Hose Clamp Installation
NOTE: All hose clamps will lose torque after
installation due to "compression set." However,
when correctly installed, Breeze ConstantTorque clamps will hold enough torque to automatically adjust and keep consistent sealing
pressure. During vehicle operation and shutdown, the screw tip may adjust according to
temperature and pressure changes. The torque
may need to be adjusted for individual applications.
IMPORTANT: On vehicles with EPA07 compliant
engines, the coolant capacity varies depending
on the engine and accessory installation. After
servicing the cooling system, always verify that
Acterra Maintenance Manual, January 2007
20
Engine Cooling/Radiator
the coolant level is between the MIN and MAX
lines on the surge tank.
7. Fill the radiator with coolant.
Use a mixture of 50 percent water and 50 percent corrosion-inhibiting antifreeze to protect the
engine to –34°F (–37°C) year round.
20–03 Fan Clutch Checking
(Noise Emission
Control)
Eaton Viscous Fan Clutch
See Table 1 for engine cooling system capacities.
See Table 2 for approved antifreezes.
Coolant Capacities (pre-EPA07 engines)
Engine Make and
Model
Radiator Core
and System Capacity*
2 Row
quarts (liters)
3 Row
quarts (liters)
28 (26.5)
—
Cummins B Series
30.5 (28.9)
31.0 (29.3)
Cummins C Series
and M11
31.2 (29.5)
—
Caterpillar 3126
Series
* System capacity includes all hoses, fittings, and the heater core.
CAUTION
If the fan drive assembly is damaged, replace the
unit as soon as possible. Operating a seized or
otherwise damaged clutch reduces fuel economy,
and could cause serious engine damage.
See Group 20 of the Acterra® Workshop Manual for
replacement instructions.
1. With the engine off, rotate the fan at least one
full turn by hand. It should have a smooth,
steady drag. If it does not, replace the fan clutch.
2. Check for physical damage to the fan or fan
shroud.
3. At the fan clutch mounting:
Table 1, Coolant Capacities (pre-EPA07 engines)
3.1
Check for correct drive belt alignment and
tension. For specifications, see Group 01
of this manual.
Approved Coolants
3.2
Check for wear of the fan clutch bearings.
There should be no side-to-side or inand-out movement of the fan clutch.
3.3
Do all of the checks in Section 20.02 of
the Acterra® Workshop Manual.
Engine Type
Diesel
Gasoline
Coolant
Manufacturer
Coolant
Designation*
Texaco
JC04 Antifreeze
Van Waters and
Rogers Ltd.
(Canada)
Diesel Antifreeze
No. 6038
Chrysler
Mopar
* Sterling-approved antifreeze must meet one of the following conditions: A.
Ethylene glycol solution that meets GM 6038–M Engineering Standards. B.
Ethylene glycol solution that has less than 0.1% anhydrous sodium metasilicate, and meets either GM 1825–M or GM 1899–M Engineering Standards.
Table 2, Approved Coolants
NOTE: You can mix purple-pink coolant (precharged with a borate/nitrate-based additive)
with the common green coolant, although some
color change will be apparent.
Horton Advantage® Fan Clutch
NOTE: If any part of the fan clutch needs to be
repaired or replaced after performing the checks
below, see Group 20 of the Acterra® Workshop
Manual.
1. Disconnect the the batteries at the negative terminals. Drain all air from the air system. If
equipped with an air starter, drain the air starter
reservoir.
WARNING
Make sure the batteries are disconnected, and if
applicable, the air starter reservoir is drained before checking the fan clutch. If the engine starts
Acterra Maintenance Manual, January 2007
20/3
20
Engine Cooling/Radiator
during this procedure, the fan could engage,
which could result in serious personal injury.
2. Inspect the electrical connections and wires to
the fan clutch solenoid. Secure the connection, if
loose; replace wires and connectors if damaged.
3. Clean the fan clutch air solenoid valve filter, if
equipped.
3.1
Unscrew the fan clutch solenoid valve air
filter assembly and remove the filter element.
3.2
Clean the filter element with cleaning solvent.
3.3
Reassemble the clutch valve solenoid air
filter assembly and install on the vehicle.
down the engine. Separate the halves of the fan
solenoid connector. The fan clutch should engage.
If the fan does not operate correctly, see Group
20 of the Acterra® Workshop Manual for troubleshooting and repair procedures.
8. With the air system charged to 120 psi (827
kPa), and with the fan solenoid connector halves
separated, check the fan clutch for audible air
leaks, using a suitable listening device.
9. If a leak is detected, remove the fan blade. Using
a soapy water solution, check the fan clutch at
the following locations to locate the source of the
leak. Install a new seal kit. See Group 20 of the
Acterra® Workshop Manual for repair procedures.
4. Check the fan for bent, cracked, or damaged
blades. Replace, if damaged. Check for adequate clearance between the fan and other
components.
9.1
Check for a leak at the bleed hole on the
fan pilot. Air leakage means that the cartridge assembly (see Fig. 6, Ref. 16) or
face seal (Ref. 17) is damaged.
5. Check the fan belt for wear, tension, and alignment. Correct, if necessary.
9.2
6. Check for wear on the friction facing. See Fig. 5.
Replace the friction facing if it is worn to a 1/16inch (1.6-mm) thickness or less. Also check the
facing for signs of oil contamination or burn
marks. If evidence of oil or burn marks are
found, replace the friction facing.
Check for air leaks between the air chamber and the piston friction disc. Air leakage means that the large O-ring (Ref. 14)
is damaged.
9.3
Check for air leaks around the safeguard
hole on the piston friction disc. Air leakage means the small O-ring (Ref. 18) is
damaged.
9.4
Check for air leaking from the System
Sentry® fuse. Leaking air means the
clutch has gotten so hot the lead alloy in
the fuse melted. This released the clutch
before the heat could damage the clutch
bearings. Before replacing the fuse, find
and repair the source of the heat.
3
4
5
2
10. If equipped with an override toggle switch on the
dash, check the fan clutch operation as follows:
1
10.1
Connect the halves of the fan solenoid
connector.
10.2
Turn the air conditioner off.
10.3
Start the engine and charge the air system to 120 psi (827 kPa). Tests must be
performed with the engine temperature
below 205°F (96°C) for Caterpillar engines, and below 200°F (93°C) for Cummins.
10.4
Set the toggle switch to the ON position;
the fan clutch should engage.
f200290
08/08/94
Sentry®
1. System
Fuse
2. Safeguard Hole
3. Friction Facing
4. Piston Friction Disc
5. Air Chamber
Fig. 5, Horton Advantage Fan Clutch
7. Connect the battery cables. Start the engine, and
charge the air system to 120 psi (827 kPa). Shut
20/4
Acterra Maintenance Manual, January 2007
20
Engine Cooling/Radiator
8
7
6
19
5
20
18
4
17
3
1
14
2
21
22
23
15
13
16
12
11
9
10
24
03/30/95
f200194a
9.
10.
11.
12.
13.
14.
15.
16.
1. Mounting Bracket
2. Rear Sheave Bearing
3. Inner and Outer Bearing
Spacers
4. Forward Sheave Bearing
5. Sheave
6. Friction Facing
7. Journal Spacer
8. Socket-Head Capscrew
Rear Hub Bearing
Bearing Spacer
Splined Hub
Forward Hub Bearing
Piston Friction Disc
Large O-Ring
Locknut
Cartridge Assembly
17.
18.
19.
20.
21.
22.
23.
24.
Face Seal
Small O-Ring
Air Chamber
Socket-Head Capscrew
Stud Bolt
Lockwasher
Hexnut
Piston Assembly
Fig. 6, Horton Advantage Fan Clutch Components
10.5
Apply the foot brake, and release the
parking brakes.
during this procedure, the fan could engage,
which could result in serious personal injury.
10.6
Set the toggle switch to the AUTO or OFF
position; the air should exhaust and the
fan clutch should disengage. Replace the
switch, if necessary.
2. Measure the distance from the back surface of
the fan clutch retaining plate to the forward-most
edge of the fan belt pulley. See Fig. 7, Ref. A.
Kysor K22RA Fan Clutch
1. Disconnect the electrical cables from the battery.
Drain all air from the air system. If equipped with
an air starter, drain the air starter reservoir.
WARNING
Make sure the batteries are disconnected, and if
applicable, the air starter reservoir is drained before checking the fan clutch. If the engine starts
Acterra Maintenance Manual, January 2007
3. Disconnect the line from the air inlet of the air
cylinder. Connect a shop air hose to the inlet.
4. Apply a minimum of 100 psi (690 kPa) air pressure to the air cylinder—the bearing housing will
move backwards, disengaging the clutch. Again,
measure the distance from the back surface of
the retaining plate to the forward-most edge of
the fan belt pulley.
5. Compare the two measurements; if the difference
between the two measurements exceeds 0.150
inches (3.8 mm), the clutch lining is worn and
20/5
20
Engine Cooling/Radiator
WARNING
3
2
Make sure the batteries are disconnected, and if
applicable, the air starter reservoir is drained before checking the fan clutch. If the engine starts
during this procedure, the fan could engage,
which could result in serious personal injury.
1
4
2. Inspect the electrical connections and wires to
the fan clutch solenoid. Secure the connection if
loose; replace wires and connectors if damaged.
3. Clean the fan clutch air solenoid valve filter, if
equipped.
5
6
f200237a
05/27/93
With the fan clutch engaged, measure the distance at A;
measure it again with the fan clutch disengaged.
1.
2.
3.
4.
Bearing Housing
Retaining Plate
Fan Pulley
Air Inlet (from solenoid
valve)
3.1
Unscrew the fan clutch solenoid valve air
filter assembly and remove the filter element.
3.2
Clean the filter element with cleaning solvent.
3.3
Using a clean, lint free cloth, wipe off any
excess solvent.
3.4
Reassemble the clutch valve solenoid air
filter assembly and install on the vehicle.
A
5. Air Cylinder
6. Fan
Fig. 7, Kysor K22RA Fan Clutch Lining Wear Checking
must be replaced. See Group 20 of the Acterra®
Workshop Manual for clutch lining replacement
instructions.
6. Release the air pressure, then disconnect the
shop hose from the air inlet of the air cylinder.
Connect the vehicle air hose to the inlet.
7. Connect the electrical cables to the battery.
8. Start the engine.
Horton DriveMaster® Fan Clutch
NOTE: If any part of the fan clutch needs to be
repaired or replaced after performing the checks
below, see Group 20 of the Acterra® Workshop
Manual.
1. Disconnect the batteries at the negative terminals. Drain all air from the air system. If
equipped with an air starter, drain the air starter
reservoir.
4. Visually check the fan for bent, cracked, or damaged blades. Replace if damaged. Check for adequate clearance between the fan and other
components.
5. Check the fan belt for wear, tension, and alignment. Correct, if necessary.
6. Check for wear on the friction facing. Replace
the friction facing if it is worn to a 3/16-inch (4.8mm) thickness or less. Also check the facing for
signs of oil contamination or burn marks. If evidence of oil or burn marks are found, replace the
friction facing.
7. Connect the battery cables. Start the engine, and
charge the air system to 120 psi (827 kPa).
Manually engage and disengage the fan clutch.
Check the fan and the fan clutch from a distance. Look for vibration, fan blade contact, fan
clutch slippage, and overall fan clutch operation.
If the fan clutch does not operate correctly, see
Group 20 of the Acterra® Workshop Manual for
troubleshooting and repair procedures.
8. With the air system charged to 120 psi (827
kPa), check the fan clutch for audible air leaks,
using a suitable listening device.
20/6
Acterra Maintenance Manual, January 2007
20
Engine Cooling/Radiator
Check at the solenoid valve, the air filter assembly, and the air hoses and fittings. See Fig. 8.
Using a wet finger or a soapy water solution,
check for a leak in the same areas.
05/30/2002
f200581
Fig. 8, Checking for Air Leaks (Horton DriveMaster)
9. If a leak is detected, remove the fan blade. Install a new seal kit. See Group 20 of the
Acterra® Workshop Manual for repair procedures.
10. Check the fan drive for discoloration or any other
signs of slipping or overheating.
NOTE: The fan clutch may slip if the air supply
pressure is below 70 psi (483 kPa) or if there is
a leak inside the fan clutch. Any leak must be
remedied.
11. Check the fan clutch bearings.
11.1
Turn the fan in both directions and feel
for worn hub bearings.
11.2
If possible, remove the drive belt and
check for worn sheave bearings by turning the sheave in both directions.
11.3
If either the hub or sheave bearings are
worn, replace them, using a Horton DriveMaster Super Kit.
For instructions and kit part number, see
Group 20 of the Acterra® Workshop
Manual.
Acterra Maintenance Manual, January 2007
20/7
Clutch
25
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Clutch (Pull-Type) Inspecting and Adjusting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–02
Clutch Release Bearing and Release Cross-Shaft Lubricating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–01
Hydraulic Fluid Level Checking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–03
Hydraulic Fluid Replacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25–04
Acterra Maintenance Manual, September 2002
25
Clutch
25–01 Clutch Release Bearing
and Release Cross-Shaft
Lubricating
Clutch Release Bearing
CAUTION
Do not over-lubricate the clutch release bearing.
Over-lubrication could contaminate the clutch internally, causing clutch slippage and premature
failure. Do not use chassis grease or multipurpose
lubricants.
On clutches with a grease-type release bearing (see
Fig. 1), wipe the dirt from the grease fitting. Using a
pressure gun and high-temperature grease only, lubricate the release bearing at the grease fitting until
the grease starts coming out of the fitting. Use only a
lithium-based grease that meets NLGI grade 1 or 2
specifications.
On Sachs hydraulic clutches, never lubricate the
release bearing. The release bearing is made of
plastic with a kind of embedded grease.
Clutch Release Cross-Shaft
The clutch release cross-shaft is equipped with two
grease fittings; one at each side of the transmission
clutch housing. Wipe the dirt from the grease fittings.
Using a pressure gun, lubricate the cross-shaft with
multipurpose chassis grease.
25–02 Clutch (Pull-Type)
Inspecting and
Adjusting
See Group 25 of the Acterra® Workshop Manual for
clutch (pull-type) inspection and adjustment.
25–03 Hydraulic Fluid Level
Checking
WARNING
Use only approved clutch hydraulic fluid (DOT 3
brake fluid) in the clutch hydraulic system. Do not
mix different types of brake fluid. The wrong fluid
will damage the rubber parts of the system, causing loss of clutch function and the risk of serious
personal injury.
CAUTION
Do not allow the fluid level in the reservoir to go
below the MIN line. If too much air enters, the hydraulic system will not operate correctly, and the
clutch could be damaged.
If the fluid level is below the MIN mark, fill the reservoir with DOT 3 brake fluid until the level reaches the
MAX mark. See Fig. 2.
05/27/93
f250081a
Fig. 1, Release Bearing Grease Fitting
NOTE: On clutches with a sealed release bearing, the release bearing is lubricated at the time
of manufacture and requires no additional
grease for the life of the bearing.
Acterra Maintenance Manual, September 2002
25–04 Hydraulic Fluid
Replacing
Replace the clutch hydraulic fluid every two years to
ensure clutch function is reliable and correct. Use the
25/1
25
Clutch
2
1
1
2
3
4
3
5
4
10
7
6
9
8
7
5
06/17/2002
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
6
f250589
Clamp Mounting Bolt, 1/4–20
Steel-Plated Flatwasher
Locknut, 1/4–20
Bell Housing Standoff Bracket
Hydraulic Hose
Bleed Valve
Slave Cylinder
Slave Cylinder Capscrew, M8
Flatwasher, M8
Cushioned Clamp
Fig. 3, Clutch Slave Cylinder
f250588
06/17/2002
1.
2.
3.
4.
Reservoir
Reservoir Cap
Pedal Unit
Master Cylinder
5. Hydraulic Hose
6. Slave Cylinder
7. Reservoir Hose
WARNING
procedures below. Fluid replacement must be done
at an authorized Freightliner service facility.
Clutch hydraulic fluid (DOT 3 brake fluid) is hazardous. It may be a skin irritant and can cause
blindness if it gets in your eyes. Always wear
safety glasses when handling clutch hydraulic
fluid or bleeding hydraulic lines. If you get clutch
hydraulic fluid on your skin, wash it off as soon
as possible.
Draining and Filling
4. Drain the hydraulic fluid.
Fig. 2, Clutch Components
1. Shut down the engine.
4.1
Using a drain pan or other suitable container, collect the fluid that drains from the
reservoir, not more than 0.3 quarts (0.3
liters).
4.2
Allow the open end of the drain hose to
remain over the drain pan.
2. Apply the parking brakes, chock the front and
rear tires, and open the hood.
3. Using a flat-tip screwdriver, remove the quickdisconnect clamp that attaches the hydraulic
hose to the slave cylinder. Retain the clamp for
later installation. See Fig. 3.
25/2
Acterra Maintenance Manual, September 2002
25
Clutch
4.3
Press down on the pedal several times,
until no more fluid drains from the reservoir.
4.4
Cover the hose to avoid contamination of
the clutch hydraulic fluid.
5. Connect the hydraulic hose to the slave cylinder.
Install the clamp, as removed.
6. Fill the reservoir with approved DOT 3 brake fluid
and bleed the system according to the procedures under the heading "Bleeding the Clutch."
See Fig. 4.
2
3
1
6
Bleeding the Clutch
10
1. Apply the parking brake and chock the tires.
2. Prepare the pressure bleeding equipment according to the manufacturer’s instructions. Use
DOT 3 brake fluid. Pressurize the bleeder unit to
15 psi (103 kPa).
9 8
7
11
4
5
CAUTION
Do not spill clutch hydraulic fluid (DOT 3 brake
fluid) on the cab paint. Clean it off immediately if
any is spilled. DOT 3 brake fluid can damage
paint.
3. Remove the reservoir lid and install the pressure
bleed adaptor on the reservoir.
12
4. Remove the cap from the bleed valve. Install a
transparent drain hose on the bleed valve of the
slave cylinder.
IMPORTANT: The slave cylinder may not be
mounted in a horizontal position. If it isn’t, remove the slave cylinder and hold it in a horizontal position to completely purge all air from the
cylinder.
5. Pressurize the reservoir, filling the system. Open
the bleed valve on the bleed tank.
NOTE: A pressure bleeder hose (J-29532) and
a bleeder adaptor (J-35798) for the fluid reservoir are available through SPX Kent-Moore
Tools and may be used to complete the following procedure. To order these parts, call KentMoore at 1-800-328-6657.
6. Press the clutch pedal all the way down and
keep it down.
Acterra Maintenance Manual, September 2002
13
16
14
15
17
08/05/2002
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
f250594
Reservoir
Reservoir Cap
Clutch Support Plate
Locking Capscrew, M6
Hardened Flatwasher
Clevis
Clevis Pin
Master Cylinder
Elbow Connector
Reservoir Hose
11.
12.
13.
14.
Hose Connector
Hydraulic Hose
Cushioned Clamp
Clamp Mounting Bolt,
1/4–20
15. Steel-Plated Washer
16. Locknut, 1/4–20
17. Shock Bracket
Standoff Bracket
Fig. 4, Clutch Master Cylinder
7. Open the slave cylinder bleed valve. Observe the
flow of clutch hydraulic fluid through the drain
25/3
25
Clutch
hose. When no bubbles appear in the fluid, close
the valve on the slave cylinder. Release the
clutch pedal and then close the valve at the
bleeder unit.
8. Disconnect the bleeder unit, and install the cap
on the slave cylinder bleeder valve.
9. Check the fluid level in the reservoir. If necessary, add or remove clutch hydraulic fluid to bring
the fluid level to the MAX mark. Install the reservoir cap.
10. Depress the clutch pedal a few times. There
should be resistance over the full pedal stroke.
11. Check the entire system for leaks. Tighten connections if necessary. Check the fluid level in the
reservoir again.
12. Remove the chocks from the tires.
25/4
Acterra Maintenance Manual, September 2002
Transmission
26
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Allison Transmission Breather Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26–03
Allison Transmission Fluid and Filter Changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26–04
Eaton Fuller and TTC Transmission Fluid Changing and Magnetic Plug
Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26–02
Manual Transmission Fluid Level Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26–01
Mercedes-Benz Transmission Fluid Changing and Magnetic Plug Cleaning . . . . . . . . . . . . . . . . . . . . . . . 26–05
Mercedes-Benz Transmission Leak Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26–06
Acterra Maintenance Manual, March 2005
26
Transmission
26–01 Manual Transmission
Fluid Level Checking
Approved Manual Transmission Lubricants
1. Park the vehicle on a level surface. Apply the
parking brakes and chock the rear tires.
2. With the transmission at operating temperature,
check the fluid level in the transmission.
2.1
2.2
Temperature:
SAE
°F (°C)
Viscosity
Lubricant Type*
Clean the area around the fill plug, then
remove the plug from the side of the
case.
Using your finger or a bent pipe cleaner,
see if the fluid is level with the lower edge
of the fill opening. See Fig. 1.
Straight mineral gear oil with
rust and oxidation inhibitor
(API GL–1)
Above 10 (–12)
90
Above –15
(–26)
80
Synthetic engine oil meeting
MIL-L-2104D, MIL-L-46152B,
API-SF, or API-CD
All
50
Mercedes-Benz Transmissions
MobilTrans SHC® DC
All
50
* Lubricants listed in order of preference. Do not mix types of oil.
† Call 1-800-826-4357 for a complete list of Eaton approved lubricants.
Table 1, Approved Manual Transmission Lubricants
CAUTION
10/05/94
B
A
A. Full
f260006b
B. Low
Fig. 1, Transmission Fluid Level Checking
3. If needed, fill the transmission with fluid until
level with the lower edge of the fill opening.
See Table 1 for approved lubricants.
Approved Manual Transmission Lubricants
Lubricant Type*
Temperature:
SAE
°F (°C)
Viscosity
Eaton Fuller Transmissions†
MobilTrans SHC 50 (RN
2952 E-5)
All
50
Synthetic transmission
lubricant approved by Eaton
All
50
Heavy-duty engine oil (API
service classification CD or
SF)
Above 10 (–12) 40 or 50
Below 10 (–12)
30
TTC Transmissions
Heavy-duty engine oil (API
service classification CD or
SF)
Above 0 (–18)
30 or 40
Above –15
(–26)
30
Acterra Maintenance Manual, March 2005
Operating a manual transmission with the fluid
level higher or lower than recommended can result in transmission damage. Do not overfill the
transmission; overfilling will force fluid out of the
case through the main shaft openings. Fluid overflow may also drain onto the clutch or clutch
brake, causing additional problems.
IMPORTANT: Do not mix types of fluid, because
of possible incompatibility. Do not use fluid additives or friction modifiers. Do not use multiviscosity fluids or EP (Extreme Pressure) gear fluids. If switching from a petroleum-based
lubricant to a synthetic, all areas of each affected component must be thoroughly drained.
Switching to a synthetic lubricant, when a
petroleum-based lubricant has been used for
50,000 miles (80 000 km) or longer, may affect
transmission performance. Monitor all seal
areas for the first 10,000 miles (16 000 km)
after changing to a synthetic from a petroleumbased lubricant.
4. Clean the fill plug, then install it in the transmission. Tighten the plug as follows:
• 25 to 35 lbf·ft (34 to 48 N·m) for Eaton
Fuller transmissions with 3/4-inch pipe
threads.
• 60 to 75 lbf·ft (81 to 102 N·m) for Eaton
Fuller transmissions with 1-1/4-inch pipe
threads.
26/1
26
Transmission
• 42 lbf·ft (57 N·m) for all Mercedes-Benz
transmissions.
26–02 Eaton Fuller and TTC
Transmission Fluid
Changing and Magnetic
Plug Cleaning
1. Park the vehicle on a level surface. Apply the
parking brakes and chock the rear tires.
2. Drain the fluid while the transmission is warm.
3. Clean the area around the fill plug and the drain
plug(s).
4. Remove the fill plug from the side of the gear
case. Remove the drain plug(s) from the bottom
of the gear case.
5. Clean the magnetic plug(s) before installation.
Use a piece of key stock, or any other convenient steel slug, to short the two magnetic poles
and divert the magnetic field.
6. Install and tighten the drain plug(s) 50 lbf·ft (68
N·m).
Filling
1. Add fluid until it is level with the lower edge of
the fill opening. See Fig. 1. If the transmission
has two fill openings, add fluid to the level of
both fill openings.
See Table 1 for approved transmission lubricants, and Table 2 for lubricant capacities.
Eaton Fuller and TTC Transmission Lubricant
Capacities
Refill Capacity*:
quarts (liters)
Eaton Fuller 5-Speed FS Series
FS–4205A/B
6.25 (5.9)
FS–5205A/B
6.25 (5.9)
FS–6305A/B
9.75 (9.2)
Eaton Fuller 6-Speed FS/FSO Series
FS–5406A
26/2
Transmission Model
Refill Capacity*:
quarts (liters)
FS–6406A
9.75 (9.2)
FSO–6406A
FSO–8406A
9.75 (9.2)
6-Speed Autoshift (all)
10.4 (9.8)
Eaton Fuller 7-Speed T Series
Draining
Transmission Model
Eaton Fuller and TTC Transmission Lubricant
Capacities
9.75 (9.2)
T–14607A/B
18.0 (17.0)
7-Speed Autoshift (all)
18.0 (17.0)
TTC 7-Speed ES Series
ESO66-7B
11.0 (10.4)
Eaton Fuller 9-Speed RT/RTF Series
RT–6609A
6.0 (5.7)
RT–8709B
13.0 (12.3)
RTF–8709B
RT–8608L
13.5 (12.8)
Eaton Fuller 10-Speed FR/FRO and RT Series
10-Speed FR/FRO (all)
11.75 (11.1)
RT–9710B
13.0 (12.3)
RT–8908LL
14.0 (13.2)
10-Speed Autoshift AS2 (all)
13.0 (12.3)
* Quantities listed are approximate. Fill the transmission until the lubricant
is level with the bottom of the fill hole, with the vehicle in normal operating
position.
Table 2, Eaton Fuller and TTC Transmission
Lubricant Capacities
CAUTION
Operating a manual transmission with the fluid
level higher or lower than recommended can result in transmission damage. Do not overfill the
transmission; overfilling will force fluid out of the
case through the main shaft openings. Fluid overflow may also drain onto the clutch or clutch
brake, causing additional problems.
IMPORTANT: Do not mix types of fluid, because
of possible incompatibility. Do not use multiviscosity fluids or EP (Extreme Pressure) gear fluids. Do not use fluid additives or friction modifiers. If switching from a petroleum based
lubricant to a synthetic, all areas of each af-
Acterra Maintenance Manual, March 2005
26
Transmission
fected component must be thoroughly drained.
Switching to a synthetic lubricant, when a
petroleum-based lubricant has been used for
50,000 miles (80 000 km) or longer, may affect
transmission performance. Monitor all seal
areas for the first 10,000 miles (16 000 km)
after changing to a synthetic from a petroleumbased lubricant.
NOTE: The correct fluid capacity is established
by the fill plug opening.
2. Clean the fill plug, then install it in the transmission. Tighten the plug as follows:
• 25 to 35 lbf·ft (34 to 48 N·m) for Eaton
Fuller transmissions with 3/4-inch pipe
threads.
• 60 to 75 lbf·ft (81 to 102 N·m) for Eaton
Fuller transmissions with 1-1/4-inch pipe
threads.
26–03 Allison Transmission
Breather Checking
Transmission housing breathers must remain clear. A
plugged breather could result in pressure build-up,
which could cause fluid leakage.
If the breather is plugged, clean or replace it. See
Fig. 2. Check more often if the vehicle is operating
under very dusty conditions.
26–04 Allison Transmission
Fluid and Filter
Changing
1000/2000/2400 Series
1. Park the vehicle on a level surface and apply the
parking brakes.
2. Run the engine until the transmission fluid
reaches the operating temperature of 160 to
200°F (71 to 93°C). Shift the transmission to
neutral (N) and shut down the engine.
CAUTION
To prevent dirt from entering the transmission,
use only clean containers and fillers for the transmission fluid. Do not use fillers or containers that
have been used for water or antifreeze. Dirt, water,
or antifreeze could damage the transmission.
3. Clean the area around the drain plug. Place a
drain pan under the transmission and remove the
drain plug. Examine the fluid while it drains. If
only the filter is being changed, do not drain the
fluid.
NOTE: A lot of fluid will drain when the filter is
removed.
4. Using a standard strap-type filter wrench, remove
the filter by turning it counterclockwise.
5. Remove the magnet from the filter attachment
tube or from the top of the filter element.
6. Clean any metal debris from the magnet. Then,
install the magnet on the filter attachment tube.
7. Using transmission fluid, lubricate the gasket on
the filter.
8. Using your hand, install the filter by turning it
clockwise until the filter gasket contacts the converter housing or cooler manifold. Then, turn the
filter one more complete turn.
9. Install the drain plug and sealing washer. Tighten
the plug 22 to 30 lbf·ft (30 to 40 N·m).
f260007a
05/27/93
Fig. 2, Transmission Breather
Acterra Maintenance Manual, March 2005
10. Clean the area around the fill tube and remove
the dipstick. Using a clean funnel in the fill tube,
add transmission fluid. See Table 3 for approved
transmission lubricants, and Table 4 for lubricant
capacities.
26/3
26
Transmission
11. Check and adjust the fluid level using the procedure under "Checking the Fluid Level."
Approved Allison Transmission Lubricants
Lubricant Type*
Temperature: °F (°C)
SAE
Viscosity
All Allison Transmissions
Castrol TranSynd™
(synthetic)
Above –22 (–30)
—
On-Highway Transmissions (1000/2000/2400 Series)
Dexron® III
Above –13 (–25)
—
AT and MD Series
Dexron III
Above –13 (–25)
—
MT Series
Dexron III
Above –13 (–25)
—
Type C4
10 to 120 (–12 to 48)
SAE 10W
Type C4
32 to 120 (0 to 48)
SAE 30W
* Lubricants listed in order of preference. Do not mix types of oil.
Table 3, Approved Allison Transmission Lubricants
Allison Transmission Lubricant Capacities
Transmission Model
Fill Capacity*:
quarts (liters)
On-Highway Series
1000/2000/2400
15.0 (14.2)
AT Series
AT–545
16.0 (15.1)
MT Series
MT–643
15.0 (14.2)
MT–653
MD Series
MD–3060
MD–3560
CAUTION
To prevent dirt from entering the transmission,
use only clean containers and fillers for the transmission fluid. Do not use fillers or containers that
have been used for water or antifreeze. Dirt, water,
or antifreeze could damage the transmission.
3. Clean the area around the drain plug. While the
transmission fluid is warm, remove the drain plug
and drain the fluid. Disconnect the fill tube from
the oil pan.
IMPORTANT: Examine the used transmission
fluid for dirt, coolant or water, and metal particles. If any of these contaminants are present,
a problem may exist within the transmission
system.
4. Support the oil pan, then remove the twenty-one
washer-head screws that attach the oil pan to
the transmission case. Remove the pan, and discard the pan gasket.
5. Clean the oil pan with mineral spirits.
6. Remove the washer-head screw that attaches
the internal fluid filter to the filter spacer, then
remove the filter and discard it. See Fig. 3. Remove the fluid intake tube, then remove the seal
ring from the intake tube, and discard the seal
ring.
7. Remove, clean, and install the governor feed line
screen, located in the control valve body. See
Fig. 4.
8. Install a new seal ring in the fluid intake tube.
19.0 (18.0)
* Quantities listed are approximate. Add the recommended amount of fluid
as listed under fill capacity, then perform a "hot check" and add fluid as
needed. Do not overfill.
Table 4, Allison Transmission Lubricant Capacities
AT Series
1. Park the vehicle on a level surface and apply the
parking brakes.
26/4
2. Run the engine until the transmission fluid
reaches the operating temperature of 160 to
200°F (71 to 93° C). Shift the transmission to
neutral (N) and shut down the engine.
IMPORTANT: Avoid twisting the intake tube
when installing the internal fluid filter, intake
tube, and seal ring; the seal ring could be
pinched, cut, or deformed. An air-tight seal must
be maintained.
9. Install the intake tube, with the seal ring installed,
into the main housing. Install the internal fluid
filter on the intake tube, making sure the grommet in the filter fits the intake tube snugly.
10. Install the washer-head screw to retain the fluid
filter, and tighten it 10 to 15 lbf·ft (14 to 20 N·m).
Acterra Maintenance Manual, March 2005
26
Transmission
12.3
Evenly tighten all 21 of the screws 10 to
15 lbf·ft (14 to 20 N·m). Check the gasket
fit while the screws are being tightened.
IMPORTANT: The oil pan bolts must maintain a minimum torque of 60 lbf·in (680
N·cm) after the oil pan gasket has taken a
set.
13. Install the fill tube at the side of the pan. Tighten
the tube fitting 90 to 100 lbf·ft (122 to 136 N·m).
6
5
1
15. Replace the external (auxiliary) fluid filter.
2
16. Clean the area around the fill tube and remove
the dipstick. Using a clean funnel in the fill tube,
add transmission fluid. See Table 3 for approved
transmission lubricants, and Table 4 for lubricant
capacities.
3
4
f260133a
10/05/94
1.
2.
3.
4.
Fluid Intake Tube
Filter Spacer
Internal Fluid Filter
Washer-Head Screw
5. Governor Pressure
Tube
6. Governor Feed Tube
Fig. 3, Allison AT Series Transmission Filter
11. Submerge a new oil pan gasket in transmission
fluid for five minutes. Then place the gasket on
the pan; do not use any substance as a gasket
retainer.
IMPORTANT: Do not use gasket-sealing compounds any place inside the transmission or
where they might get washed into the transmission. Also, nonsoluble vegetable-based cooking
compounds or fibrous greases must not be used
inside the transmission.
12. Install the oil pan and gasket.
12.1
12.2
14. Install the drain plug and gasket, and tighten the
plug 15 to 20 lbf·ft (20 to 27 N·m).
Guide the pan and gasket carefully into
place. Guard against dirt or foreign material entering the pan. Retain the pan with
four 5/16–18 washer-head screws, installed by hand into the corners of the
pan.
Install the remaining seventeen washerhead screws by hand, carefully threading
each through the gasket and into the
transmission. Bottom all of the screws
before tightening any of them.
Acterra Maintenance Manual, March 2005
17. Check and adjust the fluid level using the procedure under "Checking the Fluid Level."
MD Series
When draining transmission fluid, check for evidence
of dirt or water contamination. A small amount of
condensation will appear in the fluid during operation.
Water contamination is normally characterized as a
milky discoloration of the transmission fluid. Obvious
contamination of the transmission fluid indicates a
leak between the water and fluid areas of the transmission cooler. Inspect and pressure-test the cooler
to confirm the leak; replace leaking transmission
coolers.
CAUTION
To prevent dirt from entering the transmission,
use only clean containers and fillers for the transmission fluid. Do not use fillers or containers that
have been used for water or antifreeze. Dirt, water,
or antifreeze could damage the transmission.
1. Park the vehicle on a level surface and apply the
parking brakes.
2. Operate the vehicle until the transmission
reaches normal operating temperature: 160 to
200°F (71 to 93°C).
3. Clean the area around the drain plug and the
transmission fluid pan. Place a drain pan under
26/5
26
Transmission
1
8
2
3
4
9
10
7
5
6
f260132a
10/05/94
1.
2.
3.
4.
5.
6.
Fluid Intake Tube
Detent Spring
Detent Spring 1-3/4" Bolt
Filter Spacer
2-1/4" Bolt (16 qty.)
First/Reverse Clutch Feed Tube 3" Bolt (2 qty.,
behind)
7.
8.
9.
10.
First/Reverse Clutch Feed Tube
Governor Screen (in control valve body)
Governor Pressure Tube
Governor Feed Tube
Fig. 4, Allison AT Series Transmission Governor
the transmission and remove the drain plug. Examine the fluid as it drains. If only the filter is
being changed, do not drain the fluid.
7. Lubricate the new O-rings with transmission fluid,
and install them on the cover assemblies.
4. Remove the 12 mounting bolts (six each) from
the two filter covers.
8. Install a new square-cut seal on each cover assembly, and install the fluid filter elements on the
cover assemblies.
NOTE: A lot of fluid will drain when the filter
covers are removed.
9. Install the filter and cover assemblies into the
filter compartment.
5. Remove the filter covers, O-rings, and two
square-cut seals from the transmission. See
Fig. 5.
10. Align each cover assembly with the holes in the
channel plate sump, and push the cover assemblies in by hand to seat the seals.
6. Remove the filters from the bottom of the control
module.
26/6
Acterra Maintenance Manual, March 2005
26
Transmission
12. Replace the drain plug O-ring, and install the
drain plug. Tighten the drain plug 18 to 24 lbf·ft
(25 to 32 N·m).
1
1
13. Refill the transmission with fresh transmission
fluid (see Table 3) and check the fluid level. See
Table 4 for lubricant capacities.
14. Check and adjust the fluid level using the procedures under "Checking the Fluid Level."
MT Series
1. Park the vehicle on a level surface. Apply the
parking brakes and chock the rear tires.
2. Start the engine and check that the transmission
fluid temperature is 160 to 200°F (71 to 93°C)
before draining the fluid. Shift the gear selector
to neutral and shut down the engine.
3. Place a suitable container under the transmission, then remove the drain plug and gasket from
the transmission oil pan. Allow the fluid to drain.
4. Remove the nut that secures the oil filler tube to
the transmission pan.
2
5. Remove the 21 capscrews that secure the transmission oil pan to the transmission housing, then
remove the transmission oil pan and gasket from
the transmission. Discard the gasket.
2
3
3
4
4
6. Clean the oil pan of any debris and residual fluid
in an approved cleaning tank.
1
7. Remove the washer-head capscrew that secures
the filter to the transmission, then remove the
filter and the filter intake pipe from the transmission. See Fig. 6.
1
f260317
08/25/95
1. Filter Cover
2. Filter Element
3. Filter Element O-Ring
4. Square-Cut Seal
Fig. 5, Allison MD Series Transmission Filter Locations
and Components
CAUTION
Do not use the bolts to draw the filter covers to
the sump. This can damage the covers, seals, or
sump.
11. Install six bolts in each cover, and torque the
bolts 38 to 44 lbf·ft (51 to 61 N·m).
Acterra Maintenance Manual, March 2005
8. Separate the filter intake pipe from the filter, discard the O-ring, then clean the tube.
9. Install the filter intake pipe on the new filter. Install a new O-ring on the filter intake tube, then
lubricate the O-ring with a light coat of transmission fluid.
10. Insert the filter intake pipe into the orifice on the
bottom of the transmission, then secure the filter
with the 5/16–18 x 5/8 inch washer-head capscrew. Tighten the capscrew 10 to 15 lbf·ft (14 to
20 N·m).
11. Place a new oil pan gasket on the oil pan. If desired, a sealant may be used on the gasket, but
it must be applied carefully; sealant must be pre-
26/7
26
Transmission
1
13
15
2
14
7
12
11
8
3
4
6
5
10
9
08/30/96
f260369
1. Transmission Housing
2. Transmission Oil Pan Gasket
3. 5/16–18 Washer-Head
Capscrew
4. Plug
5. Transmission Oil Pan
6.
7.
8.
9.
10.
Magnet
Drain Plug Gasket
Drain Plug
5/16–18 x 5/8 Capscrew
Flatwasher
11.
12.
13.
14.
15.
Transmission Fluid Filter
Fluid-Filter Spacer
O-Ring
Fluid-Filter Tube
Plug
Fig. 6, Allison MT Series Transmission, Filter Removal
26/8
Acterra Maintenance Manual, March 2005
26
Transmission
vented from contacting areas of the oil pan
flange that are inside the raised bead of the
flange.
NOTE: Do not use gasket-type sealing compounds or cement anywhere inside the transmission or where they might get washed into
the transmission. Non-soluble vegetable-base
cooking compounds or fibrous grease must not
be used inside the transmission.
1
4
6
12. Install the oil pan and gasket onto the transmission. Check that no dirt or debris enters the pan.
Secure the pan to the transmission housing with
four 5/16–18 washer-head capscrews, installed
into the corners of the oil pan, but do not tighten.
13. Install the remaining 17 washer-head capscrews
by hand. Check that all of the capscrews are
hand-tight.
10
8
13
12
17
16
19
20
15
21
18
11
3
5
9
7
14. Using a click-type torque wrench, tighten each
capscrew 5 lbf·ft (7 N·m). See Fig. 7 for the pattern needed to distribute the torque evenly.
When all the capscrews are tightened to the first
stage, repeat this procedure. This time, torque all
the capscrews 15 to 20 lbf·ft (20 to 27 N·m).
15. Install the oil filler tube on the oil pan. Tighten
the tube fitting 90 to 100 lbf·ft (122 to 136 N·m),
then install the drain plug and gasket. Tighten
the drain plug 15 to 20 lbf·ft (20 to 27 N·m).
16. Pour approximately 15 quarts (14 liters) of transmission fluid into the transmission. Start the engine and allow the transmission fluid to circulate.
With the transmission in NEUTRAL, check the
fluid level. Check for fluid leaks. Correct any leak
with the engine OFF.
Checking the Fluid Level
CAUTION
Operating a transmission with the fluid level
higher or lower than recommended can result in
transmission damage. Do not overfill the transmission.
Do not mix types and brands of fluid, because of
possible incompatibility. Do not use fluid additives, friction modifiers, extreme-pressure gear
fluids, or multiviscosity lubricants.
14
2
09/24/96
f260396
NOTE: Torque the oil pan bolts with a click-type torque
wrench following this torque pattern. Tighten the bolts 5
lbf·ft (7 N·m), then repeat the torque pattern with a clicktype torque wrench 15 to 20 lbf·ft (20 to 27 N·m).
Fig. 7, Allison MT Series Transmission, Oil Pan Torque
Pattern
Cold Check
Clean all dirt away from around the end of the fluid
fill tube before removing the dipstick.
CAUTION
Do not allow foreign matter to enter the transmission. Dirt or foreign matter in the hydraulic system
may cause undue wear of transmission parts,
make valves stick, and clog passages.
It is important to check the fluid level cold to determine if the transmission has a sufficient amount of
fluid to be safely operated until a hot check can be
performed.
1. Park the vehicle on a flat, level surface.
2. Apply the parking brakes and chock the rear
tires.
Acterra Maintenance Manual, March 2005
26/9
26
Transmission
3. Run the engine for at least one minute.
CH
4. Shift from DRIVE to NEUTRAL, and then shift to
REVERSE to fill the hydraulic system.
EC
K IN
NE
5. Shift to NEUTRAL and allow the engine to idle at
500–800 rpm.
UTR
A
AL
AT
6. With the engine running at idle, remove the dipstick from the tube and wipe clean.
E
I DL
B
8. Check the fluid level reading and repeat the
check procedure to verify the reading.
UN
T R
HO
7. Insert the dipstick into the tube and remove the
dipstick.
If the fluid level is within the COLD RUN band,
the transmission may be operated until the fluid
is hot enough to perform a HOT RUN check.
B
C
REF
FILL
If the fluid level is not within the COLD RUN
band, add or drain fluid as needed to adjust the
fluid level to the middle of the COLD RUN band.
See Fig. 8 for the AT and MD series, and Fig. 9
for the MT series.
f260395
01/22/97
A. Transmission Housing/Oil Pan Split Line
B. Hot Run Band
C. Cold Run Band
Fig. 9, MT Series Dipstick Markings, 5.1-Inch Depth Oil
Pan
Hot Check
A
1. Park the vehicle on a flat, level surface. Apply
the parking brakes and chock the rear tires.
2. Shift the transmission to NEUTRAL.
f270002a
12/01/97
A. Cold Run Band
B. Hot Run Band
Fig. 8, AT and MD Series Dipstick Markings
CAUTION
Do not fill above the COLD RUN band if the transmission fluid is below normal operating temperature. As fluid temperature increases, so does the
fluid level. Filling above the COLD RUN band
when the transmission is below normal operating
temperature may result in an overfilled transmission, which causes fluid foaming, and aeration.
Fluid foaming and aeration cause transmission
overheating and erratic shifting.
NOTE: Perform a hot check at the first opportunity after the normal operating temperature,
160° to 200°F (71° to 93°C) has been reached.
26/10
3. Operate the engine at idle (500–800 rpm) until
normal operating temperature is reached. Check
that the sump temperature is 160 to 200°F (71 to
93°C). Check that the converter-out temperature
is 180 to 220°F (82 to 104°C).
4. With the engine idling, remove the dipstick from
the tube and wipe it clean.
5. Insert the dipstick into the tube and remove it.
6. Check the fluid level reading and repeat the
check procedure to verify the reading. Safe operating level is within the HOT RUN band on the
dipstick. The HOT RUN band is between the
HOT FULL and HOT ADD marks.
If the fluid level is not within the HOT RUN band,
add or drain fluid as needed to bring the fluid
level within the HOT RUN band. See Fig. 8 for
the AT and MD series, and Fig. 9 for the MT series.
Acterra Maintenance Manual, March 2005
26
Transmission
26–05 Mercedes-Benz
Transmission Fluid
Changing and Magnetic
Plug Cleaning
1
Draining
1. Park the vehicle on a level surface. Apply the
parking brakes and chock the rear tires.
NOTE: Drain the transmission fluid while the
transmission is warm.
2. Drain the transmission fluid. See Fig. 10.
2.1
Remove the magnetic drain plug from the
bottom of the gear case.
2.2
Discard the aluminum gasket.
2.3
Catch the transmission fluid in a suitable
container and dispose of it properly.
3
05/22/2001
2
f261102
NOTE: The transmission is shown from the left-hand
side.
1. Transmission
2. Fill Plug
3. Drain Plug
Fig. 10, MBT Drain and Fill Plugs
3. Clean the area around the fill plug.
4. Remove the fill plug from the side of the case.
Discard the aluminum gasket.
NOTE: Use a piece of key stock, or any other
convenient steel slug, to short the two magnetic
poles and divert the magnetic field.
5. Clean the magnetic drain plug before installing it.
6. Install the drain plug (p/n A 124 997 01 32) and a
new aluminum gasket (p/n N 00763 024105).
Tighten the drain plug 42 lbf·ft (57 N·m).
Filling
CAUTION
Operating a manual transmission with the fluid
level higher or lower than recommended can result in transmission damage. Do not overfill the
transmission; overfilling will force fluid out of the
case through the main shaft openings. Fluid overflow may also drain onto the clutch or clutch
brake, causing additional problems.
1. Add transmission fluid until it is level with the
lower edge of the fill opening. See Fig. 10 for
location of the fill plug and Fig. 11 for correct
level. See Table 5 for approved transmission lubricants and Table 6 for lubricant capacities.
Acterra Maintenance Manual, March 2005
B
A
10/05/94
A. Full
f260006b
B. Low
Fig. 11, MBT Fluid Level Checking
MBT Transmission Lubricant Types
Manufacturer
Type
Mobil
Mobiltrans SHC® DC
Table 5, MBT Lubricant Types
MBT Transmission Lubricant Capacities
Transmission Model
Refill Capacity*:
quarts (liters)
MBT660S-6O
9.5 (9.0)
MBT520S-6D
9.5 (9.0)
* Quantities listed are approximate. Fill the transmission until the lubricant
is level with the bottom of the fill hole, with the vehicle in normal operating
position.
Table 6, MBT Lubricant Capacities
26/11
26
Transmission
CAUTION
Use only the approved Mobiltrans SHC® DC fluid.
Do not mix fluid types. Adding SHC 50 RN 2952
E-5 fluid (used in Eaton and Meritor transmissions) could damage the radial seals.
2. Clean the fill plug before installing it.
3. Install the fill plug (p/n N000908 020001) and a
new aluminum gasket (p/n N 00763 024105).
Tighten the fill plug 42 lbf·ft (57 N·m).
26–06 Mercedes-Benz
Transmission Leak
Checking
If leakage is found, check the breather for
a missing cap. Replace the cap if necessary.
2.2
Check the fluid level at the fill plug. If the
level is too high, correct the fluid level.
3. Check for signs of leakage at the cap seal on the
shift lever. If the cap seal is damaged, replace it.
4. Check for signs of leakage at the radial seal on
the output shaft. If leakage is found, remove the
output yoke (end yoke) and replace the seal. For
procedures, see Section 26.02, Subject 120, of
the Acterra® Workshop Manual.
NOTE: There are two cover plates on the countershaft, one at the front and one at the rear.
1. Park the vehicle on a level surface. Apply the
parking brakes and chock the rear tires.
2. Check for signs of leakage at the breather. See
Fig. 12.
1
2.1
5. Check for signs of leakage at the rear cover
plate on the countershaft (next to the output
yoke). If leakage is found, check the torque on
the cover-plate bolts and check the flat seal for
damage.
5.1
If the flat seal is damaged, replace it.
5.2
If the cover-plate bolts are too loose,
tighten them 18 lbf·ft (25 N·m). If the
cover-plate bolts are too tight, replace the
flat seal and tighten to 18 lbf·ft (25 N·m).
2
6. Check for signs of leakage at the transmission
fluid fill plug. If leakage is found, check the
torque on the plug and check the aluminum gasket for damage.
9
3
4
05/22/2001
8
7
6
5
f261101
NOTE: The transmission is shown from the left-hand
side.
1.
2.
3.
4.
5.
6.
7.
8.
9.
Shift Lever Cap Seal
Breather
Output Shaft Radial Seal
Countershaft Cover Plate
Transmission Fluid Fill Plug
Transmission Fluid Drain Plug
Gear Case Seals
Clutch Slave Cylinder
Input Shaft Radial Seal
Fig. 12, MBT Leak Check
6.1
If the gasket is damaged, replace it.
6.2
If the fill plug is too loose, tighten it 42
lbf·ft (57 N·m). If the fill plug is too tight,
loosen it and tighten to 42 lbf·ft (57 N·m).
7. Check for signs of leakage at the transmission
fluid drain plug. If leakage is found, check the
torque on the plug and check the aluminum gasket for damage.
7.1
If the gasket is damaged, replace it.
7.2
If the drain plug is too loose, tighten it 42
lbf·ft (57 N·m). If the plug is too tight,
loosen it and tighten to 42 lbf·ft (57 N·m).
8. Check for fluid dripping at the gear case seals. If
substantial leakage is found at either location,
replace the transmission.
NOTE: Weeping or sweating seals are not
cause for transmission replacement.
26/12
Acterra Maintenance Manual, March 2005
26
Transmission
liquid gasket (Loctite 518) to the new
cover plate when installing it.
WARNING
Clutch hydraulic fluid (DOT 3 brake fluid) is hazardous. It may be a skin irritant and can cause
blindness if it gets in your eyes. Always wear
safety glasses when handling clutch hydraulic
fluid or bleeding hydraulic lines. If you get clutch
hydraulic fluid on your skin, wash it off as soon
as possible.
10.3
If the rear radial seal on the engine
crankshaft is leaking, replace the rear radial seal. For procedures, see the engine
manufacturer’s manual.
11. Remove the chocks from the tires.
9. Check for signs of leakage at the clutch slave
cylinder.
CAUTION
Do not spill clutch hydraulic fluid (DOT 3 brake
fluid) on the cab paint. Clean it off immediately if
any is spilled. DOT 3 brake fluid can damage
paint.
9.1
If leakage is found on the slave cylinder
body, check the fittings and hose for damage.
9.2
If leakage is found on the piston seals,
replace the slave cylinder and bleed the
clutch hydraulic system. For detailed instructions, see Group 25.
9.3
If the slave cylinder fittings and/or the
hose are damaged, replace them.
9.4
Check the torque on the slave cylinder
mounting capscrews. Tighten them 15
lbf·ft (20 N·m).
9.5
If any leakage of clutch hydraulic fluid is
found, check the fluid level in the reservoir, and add fluid if needed. For detailed
procedures, see Group 25.
NOTE: There are two cover plates on the countershaft, one at the front and one at the rear.
10. Check for signs of leakage at the clutch bell
housing. If leakage is found, check the radial
seal on the input shaft, the front cover plate on
the countershaft (inside the clutch bell housing),
and the rear radial seal on the crankshaft.
10.1
If the radial seal on the input shaft is
leaking, replace the radial seal. For procedures, see Section 26.02, Subject
120, of the Acterra® Workshop Manual.
10.2
If the cover plate on the countershaft is
leaking, replace the cover plate. Apply
Acterra Maintenance Manual, March 2005
26/13
Frame and Frame Components
31
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Fifth Wheel Inspecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31–02
Fifth Wheel Lubricating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31–03
Frame Fastener Torque Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31–01
Acterra Maintenance Manual, January 2007
31
Frame and Frame Components
31–01 Frame Fastener Torque
Checking
Tighten Hendrickson suspension fasteners to the
torque values given in Table 2.
Hendrickson Suspension Torque Values
Because of "bedding in" (or seating), frame fasteners
must be torqued at the recommended intervals.
These intervals apply to new vehicles, and to frame
fasteners that have been removed and installed.
NOTE: For off-highway operations, retorque
frame fasteners the first 1000 miles (1600 km),
then periodically, depending on operating conditions.
CAUTION
Make sure frame fasteners are properly tightened.
Continued vehicle operation with loose fasteners
could result in bracket or frame damage.
NOTE: Engine supports on vehicles built from
January 2007 do not require checking.
Typical frame fastener applications include front
frame, suspension, and spring brackets; fuel tank,
exhaust, and engine supports; frame crossmembers
and gussets; and fifth wheel mounting brackets.
For additional fastener and torque value information,
see Group 00 of the Acterra® Workshop Manual.
Tighten all Freightliner AirLiner suspension fasteners
to the torque values in Table 1. Also, tighten all suspension air line fittings and air lines.
Freightliner Airliner Torque Values
Description
Size
Torque:
lbf·ft (N·m)
Leveling Valve Adjustment Nut
1/4–20
5 (7)
Leveling Valve Mounting Nuts
5/16–18
14 (19)
3/4–16
45 (61)
1/2–13
23 (31)
Air Spring Upper Locknuts
Air Spring Lower Locknuts
1/2–13
55 (75)
Leaf-Spring-Eye Locknuts
3/4–16
270 (365)
Shock Absorber Upper Bracket
Locknuts
5/8–11
125 (170)
Air Spring Upper Bracket
5/8–11
125 (170)
Spring Hanger Locknuts
3/4–10
210 (285)
Lateral Control Rod Nut
5/8–11
185 (136)
Table 1, Freightliner AirLiner Torque Values
Acterra Maintenance Manual, January 2007
Description
Size
Torque: lbf·ft (N·m)
—
100–150 (135–200)
Top Pad Nut (RT/RTE)
—
275–400 (375–542)
U-Bolt Locknut (U/UE)
7/8–14
237–302 (321–409)
Spring Pin Locknut
1/2–13
45–63 (61–85)
Torque Rod Straddle
Mount Nut
5/8–11
190 (260)
1-1/4–12
175–225 (235–305)
Top-Pad-to-Spring
Aligning Setscrew
(RT/RTE)
Torque Rod Stud
Locknut
Saddle Cap Stud
7/8–14
3/4–16
55–65 (75–90)
Saddle Cap Locknut
(RT/RTE)
7/8–14
225–275 (305–373)
Saddle Cap Locknut
(U/UE)
3/4–16
125–145 (169–197)
Adapter-Type Beam
End Locknut
3/4–16
210–240 (285–325)
7/16–20
50–60 (70–80)
Spring Center Bolt
1/2–20
1/2–13
Rebound Spacer
Locknut
65–75 (90–100)
1/2–13
38–45 (51–61)
Spring Alignment Clip
—
15 (20)
Fore and Aft Torque
Rod Mount Nut
—
95 (130)
Table 2, Hendrickson Suspension Torque Values
All Hendrickson beam end fasteners must maintain
their torque values to firmly clamp the rubber bushing
inner metal tubes to the beam hanger legs.
WARNING
Insufficient beam end fastener torque could cause
the beam to separate from the axle. This will
cause loss of vehicle control resulting in property
damage, serious personal injury or death.
Tighten the nut (see Fig. 1) to the torque value in
Table 2. Do not over-torque.
31/1
31
Frame and Frame Components
Check the drive-axle-flange fasteners (see Fig. 2) for
tightness. Tighten the fasteners as follows:
Tighten 1/2-inch drive-axle stud nuts (with or without
dowels) 75 to 115 lbf·ft (102 to 156 N·m), and tighten
5/8-inch drive-axle stud nuts 150 to 230 lbf·ft (203 to
312 N·m).
31–02 Fifth Wheel Inspecting
5
2
WARNING
All fifth wheel maintenance, adjustment, and rebuilding must be done only by a qualified mechanic. Improper or incomplete procedures could
result in a possible disengagement of the trailer
from the tractor, which could result in personal
injury or property damage.
1
2
3
4
f320110a
05/27/93
NOTE: Do not use the three-piece adapter without the
intermediate tube.
1. Nut
2. Adapter
3. Intermediate Tube
4. Inner Metal of Beam
End Bushing
5. Beam Hanger
Fig. 1, Three-Piece Adapter-Type Beam End Connection
Parts are under spring compression. Wear safety
goggles while servicing the fifth wheel. Failure to
do so can result in personal injury, due to parts
ejecting with force.
Fontaine
Disconnect the tractor from the trailer. For instructions, see Chapter 10 of the Acterra® Driver’s
Manual. Thoroughly steam clean the fifth wheel, then
make the following checks:
1. Look for cracks in the fifth wheel assembly,
mounting brackets, and mounting parts.
2. Check moving parts for wear or damage.
3. Test the safety lock latch for operation.
4. Check for loose nuts and bolts in the fifth wheel
and in the mounting.
5. Check that all springs are securely fastened and
not deformed.
1
6. Check wedge adjustment.
6.1
Open the kingpin lock and insert a 2-inch
(51-mm) diameter shaft vertically.
6.2
Release the lock by tripping the release
latch at the bottom of the throat.
6.3
Adjust the wedge stop at the end of the
wedge to approximately 1/4-inch (6-mm)
clearance.
2
f400090b
06/09/94
NOTE: Spoke wheel shown.
1. Drive-Axle-Flange
Studs and Nuts
2. Drive-Axle Flange
Fig. 2, Drive-Axle Flange
31/2
7. If you observe any problems doing the previous
steps, correct them immediately. For instructions,
see Group 31 of the Acterra® Workshop Manual.
Acterra Maintenance Manual, January 2007
31
Frame and Frame Components
8. Replace cracked, worn, or damaged parts with
new parts. Replace loose mounting bolts with
5/8–11 SAE grade 8 bolts, grade C nuts, and
hardened washers. Do not reuse bolts, nuts, and
washers on fifth wheel mountings.
Holland
Disconnect the tractor from the trailer. For instructions, see Chapter 10 of the Acterra® Driver’s
Manual Thoroughly steam clean the fifth wheel, then
inspect for:
Holland
Lubricate all moving parts with a multipurpose chassis grease. Lubricate the two grease fittings located
on either side of the top plate with a multipurpose
chassis grease.
Once the fifth wheel’s moving parts are lubricated,
apply a heavy coat of grease to the top plate by direct application. On slide-mount applications, lubricate the baseplate rails and the plungers for smooth
operation.
1. Loose nuts or broken bolts on the fifth wheel assembly.
2. Cracks or wear on the mounting bolts.
3. Improper locking action; cracks or wear on the
jaw locking mechanism.
4. Gouges or wear on the fifth wheel top plate.
5. Fatigued or cracked welds.
6. Replace cracked, worn, or damaged parts with
new parts. Replace loose mounting bolts with
5/8–11 SAE grade 8 bolts, grade C nuts, and
hardened washers. Do not reuse bolts, nuts, and
washers on fifth wheel mountings.
7. If you observe any problems doing the previous
steps, correct them immediately. For instructions,
see Group 31 of the Acterra® Workshop Manual.
31–03 Fifth Wheel Lubricating
Fontaine
Use a multipurpose extreme pressure (EP) chassis
grease, and lubricate all moving parts on the fifth
wheel. When lubricating the top plate at the grease
fittings for the bracket bearing area, tilt the top plate
forward and backward to evenly distribute the
grease. Using a pry tool, separate the jaw and
wedge and lubricate the serrations using a brush to
distribute the grease. On slide-mount applications,
lubricate the slide rail and tapered wedges for
smooth operation.
Once the moving parts of the fifth wheel are lubricated, apply a liberal coating of grease to the top
plate and the trailer kingpin plate.
Acterra Maintenance Manual, January 2007
31/3
Suspension
32
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Suspension Inspecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32–01
Suspension Lubricating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32–02
U-Bolt Torque Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32–03
Acterra Maintenance Manual, September 2002
32
Suspension
32–01 Suspension Inspecting
of vehicle control resulting in property damage,
serious personal injury or death.
Sterling Front and Rear
Suspension Spring Assemblies
Inspecting
Sterling Spring Tandem-Axle
Suspension Crossmember and
Gussets Inpsecting
Inspect the front and rear suspension spring assemblies for pitted, cracked, broken, or abnormally bent
leaves and extreme rust. If any of these conditions
exist, replace the spring assembly. See Group 32of
the Acterra® Workshop Manual for instructions.
Inspect the tandem-axle frame crossmember and
gussets for wear, cracks, and other damage. If any of
these conditions exist, replace the damaged parts.
See Group 32 of the Acterra® Workshop Manual for
instructions. Check all fasteners for tightness; see
Group 00 of this manual for torque values.
WARNING
Do not replace individual leaves of a damaged leaf
spring assembly; replace the complete spring assembly. Visible damage (cracks or breaks) to one
leaf causes hidden damage to other leaves. Replacement of only the visibly damaged part(s) is
no assurance that the spring is safe. On front
spring assemblies, if cracks or breaks exist in the
two top leaves, a loss of vehicle control could
occur. Failure to replace a damaged spring assembly could cause an accident resulting in property
damage, serious personal injury, or death.
IMPORTANT: On multi-leaf suspensions, closely
inspect each component of the leaf spring assemblies, including the brackets, U-bolts, and
related parts.
Sterling Spring Rear Suspension
Spring Brackets and Equalizer
Brackets Inspecting
Inspect the forward and rear spring brackets, equalizer brackets, and the wear pads, for wear, cracks,
and other damage. If any of these conditions exist,
replace the damaged bracket(s) and wear pad(s).
See Group 32 of the Acterra® Workshop Manual for
instructions.
WARNING
Failure to replace the forward spring brackets,
equalizer brackets, or rear spring brackets if they
are worn, cracked, or otherwise damaged could
result in progressive damage to and eventual
breakage of the bracket. This could cause a loss
Acterra Maintenance Manual, September 2002
CAUTION
Failure to replace the suspension crossmember or
gussets if they are cracked, worn, or otherwise
damaged could result in damage to the vehicle
chassis.
Sterling Spring Shock Absorber
Checking
Make sure that the shock absorber brackets are
tight, and that the shock absorber is not striking or
rubbing on the frame or some other part of the chassis. See Fig. 1. Check the rubber mounting bushings
and replace if worn. Inspect the shock absorber for
oil leakage.
If the shock absorber is worn or damaged, replace it
with a new one.
Sterling Spring (Tandem) Radius
Rod Bushing Checking
1. Without detaching the torque arms, attempt to
move (by hand) each of the radius-rod ends up,
down, in, and out. If there is any movement, replace the torque arm.
2. Inspect the weld seams between the torque arm
tube and the shorter bushing tubes. If there are
cracks, replace the torque arm. Do not weld the
torque arm for any reason.
3. Inspect the rubber bushing ends. See Fig. 2. Replace the torque arm for any of the following reasons:
• There are gaps between the rubber bushing and the pin or the outer steel sleeve.
32/1
32
Suspension
• Either bushing end contacts a torque arm
pin mounting bolt.
• There are cracks in the bushing.
• Part of the rubber bushing extends beyond
the outside diameter of the outer bushing
sleeve.
1
Sterling Spring (Tandem)
Equalizer Bushing Checking
1. Block the frame up enough to take the weight of
the chassis off of the springs. Attempt to move
the equalizer up and down, by using a pry bar
between the top of the equalizer and the top of
the equalizer bracket. Apply hand pressure only.
See Fig. 3. If movement at the center of the
equalizer exceeds 1/8 inch (3 mm), replace the
equalizer bushings.
2. With the vehicle unloaded, attempt to move the
equalizer side to side using a pry bar between
the equalizer and frame rail. Apply hand pressure
only. See Fig. 4. If clearance between the equalizer assembly and any frame component or fastener is less than 1/8 inch (3 mm), replace the
equalizer bushings.
2
52-Inch Multi-Leaf Spring
Component Check
No lubrication is required on the 52-inch multi-leaf
spring rear suspension.
3
Inspect the stabilizer bar, if present, for irregular
bushing wear or cracks in the brackets. Check the
rubber helper spring, if present, for cracks.
f320267a
10/05/94
1. Upper Mounting Bracket
2. Shock Absorber
3. Lower Mounting Bracket
1
A
3
Fig. 1, Front Shock Absorber Installation (vehicles built
before September 15, 2002)
2
05/27/93
f320022a
A. Measure the change in gap at this point.
1. Equalizer Bracket
3. Pry Bar
2. Equalizer
Fig. 3, Side View of the Equalizer
05/27/93
f320021a
Fig. 2, Torque Arm Bushings
32/2
Acterra Maintenance Manual, September 2002
32
Suspension
Freightliner AirLiner Component
Inspecting and Operation
Checking
2
1
A
WARNING
3
4
5
05/27/93
A.
1.
2.
3.
f320023a
1/8-inch (3-mm) Clearance
Frame Fasteners
4. Equalizer
Frame Rail
5. Equalizer Bracket
Pry Bar
Fig. 4, Top View of the Equalizer
60-Inch Taper-Leaf Spring
Component Check
No lubrication is required on the 60-inch taper-leaf
spring rear suspension.
Inspect the rear shackle brackets for bushing wear or
cracks.
Inspect the stabilizer bar, if present, for irregular
bushing wear or cracks in the brackets. Check the
rubber helper spring, if present, for cracks.
Freightliner AirLiner Component
Clearance Checking
Check that the air line support brackets are positioned so the air lines do not rub against anything.
Reposition any configurations that could contact and
result in friction and wear. There must be at least 1
inch (25 mm) clearance around the rubber air spring
when inflated. If the clearance is less than 1 inch (25
mm), relocate the obstructing parts.
CAUTION
Failure to relocate obstructing parts could result
in damage to the air spring.
Inspect the components and check their operation
as described below. Failure to perform these inspections and checks could result in separation of
worn suspension components and loss of vehicle
control, possibly causing personal injury or death,
or property damage.
1. Chock the front tires. Raise the rear of the vehicle so the tires just clear the ground and the
suspension is fully extended. Place safety stands
under the vehicle frame.
2. Squeeze all air springs to check for complete
deflation. If any air springs remain partially or
fully inflated, see Group 32 of the Acterra®
Workshop Manual.
3. Inspect each air spring for wear at its connection
to its pedestal. Replace any worn air springs; for
instructions, see Group 32 of the Acterra® Workshop Manual.
4. Inspect the shock absorbers for oil leaks and
worn rubber bushings. Replace the shock absorbers and/or rubber bushings if wear or damage is noted. For instructions, see Group 32 of
the Acterra® Workshop Manual.
5. Remove the safety stands and lower the rear of
the vehicle to the ground. Run the engine until
air pressure of at least 100 psi (689 kPa) is
maintained throughout the system.
6. Check that all air springs are inflated. If the air
springs do not inflate, see Group 32 of the
Acterra® Workshop Manual for possible causes
and corrections.
Freightliner AirLiner Control Rod
Checking
1. Without disconnecting the control rods, attempt
to move (by hand) each of the control rod ends
up, down, in, and out. If there is any movement,
examine the control rods for wear or damage.
Replace if necessary.
2. Inspect the rubber bushings for cracks or cuts.
Acterra Maintenance Manual, September 2002
32/3
32
Suspension
3. Check for any shifting of the barpin.
4.1
Without disconnecting the control rods,
use your hand to attempt to move each of
the control rod ends up, down, in, and
out. If there is any movement, examine
the control rods for wear or damage. Replace if necessary.
4.2
Inspect the rubber bushings for cracks or
cuts.
4.3
Check for any shifting of the barpin.
4.4
Check for cracks in the metal components and welds.
4. Check for cracks in the metal components and
welds.
NOTE: The AirLiner suspension is manufactured
at numerous weight ratings up to 46,000
pounds. The control rod on the 46,000-poundrated suspension is larger, and is fastened differently than on other applications; see Group
32 of the Acterra® Workshop Manual for removal and installation information.
Freightliner TufTrac
5. Check all fasteners for looseness.
1. Inspect the suspension spring assemblies for
pitted, cracked, broken, or abnormally bent
leaves and extreme rust. If any of these conditions exist, replace the spring assembly.
6. Inspect the shock absorbers for oil leaks and
worn rubber bushings. Replace the shock absorbers and/or rubber bushings if wear or damage is noted.
WARNING
Do not replace individual leaves of a damaged leaf
spring assembly; replace the complete spring assembly. Visible damage (cracks or breaks) to one
leaf causes hidden damage to other leaves. Replacement of only the visibly damaged part(s) is
no assurance that the spring is safe. On front
spring assemblies, if cracks or breaks exist in the
two top leaves, a loss of vehicle control could
occur. Failure to replace a damaged spring assembly could cause an accident resulting in property
damage, serious personal injury, or death.
IMPORTANT: On multi-leaf suspensions, closely
inspect each component of the leaf spring assemblies, including the brackets, U-bolts, and
related parts.
2. Inspect the brackets for cracks in the castings.
Inspect the V-rod tower welds for cracking or
other signs of damage. Also check for contact
between the frame rail and the upper axle clamp
brackets. If contact exists, check the V-rod bushing for wear. Check the V-rod fastener torques.
3. Inspect the rubber center bearing and spring tip
pads for excessive wear, including de-lamination
of the rubber-to-metal shim interface, and distortion and degradation of rubber.
4. Inspect the V-rods and lower control rods for
wear and looseness.
32/4
Hendrickson Suspension
Inspecting
Inspect the suspension assembly for wear, cracks,
and damage to its components. Replace the component(s) if any wear, cracks, or damage exists. For
instructions, see Group 32 of the Acterra® Workshop
Manual. Check all fasteners for tightness.
Check for distorted or frayed rubber at the beam end
bushings. If the bushings are damaged, replace
them.
Check that the ends of the equalizer beam are not
lower in the beam hanger.
If the equalizer beam ends appear lower, use a jack
to raise each beam end, and check for movement of
the inner metal of the rubber end bushing (see Fig.
5). Movement cannot be corrected by tightening the
fastener, because parts could be damaged. If there is
movement, replace the rubber end bushings and all
connecting parts.
After repairs to the suspension, check the fastener
torque after the vehicle has been in service for 2500
miles (4000 km). Tighten the adapter-type beam end
connection nut (see Fig. 6), 210 to 240 lbf·ft (285 to
325 N·m). Do not over-torque.
WARNING
Insufficient beam end fastener torque could cause
the beam to separate from the axle. This will
Acterra Maintenance Manual, September 2002
32
Suspension
4
1
1
A
2
2
3
3
f320039a
05/27/93
1. Beam Hanger
2. Equalizer Beam
3. Jack
05/27/93
A.
1.
2.
3.
4.
Fig. 5, Raising the Beam End
f320112a
Minimum gap of 3/8 inch (9.5 mm).
Forward (no. 1) Spring Hanger
Spring Eye Pin
Rear (no. 2) Spring Hanger
Rear (no. 3) Extension
Fig. 7, Unloaded RTE or UE Spring Suspension
1. Inspect the spring hangers for wear of the spring
pin holes, cams, and the spring hanger legs.
5
2
1
2. If equipped with the "RTE" or "UE" series, the
gap between the rear (No. 2) spring hanger and
the top spring leaf should measure at least 3/8
inch (9.5 mm) in an unloaded condition.
If the measurement is less than 3/8 inch (9.5
mm), install new rear (No. 3) extension hangers.
Lubricate the bolt threads with SAE 20 oil.
Tighten the 1/2–13 locknuts with hardened
washers 85 lbf·ft (115 N·m).
2
4
3
f320110a
05/27/93
NOTE: Do not use the three-piece adapter without the
intermediate tube.
1. Nut
2. Adapter
3. Intermediate Tube
4. Inner Metal of Beam
End Bushing
5. Beam Hanger
Fig. 6, Three-Piece Adapter-Type Beam End Connection
cause loss of vehicle control resulting in property
damage, serious personal injury or death.
Hendrickson Leaf Spring
Assembly Inspecting
NOTE: See Fig. 7 for this procedure.
Acterra Maintenance Manual, September 2002
3. Inspect the spring leaves for cracks, gouges,
wear, or abnormal bends. The no. 1 main and
no. 2 wrapper spring leaves (the top two spring
leaves) may be individually replaced. If equipped
with the "RTE" or "UE" series suspension, the
nos. 1, 2, and 3 spring leaves (the top three
spring leaves) may be individually replaced. If a
spring leaf is damaged below these numbers in a
pack, replace the spring assembly. In addition,
replace both spring assemblies to ensure even
spring deflection.
Hendrickson Radius Rod
Bushing Checking
1. Without detaching the torque arms, attempt to
move (by hand) each of the radius-rod ends up,
32/5
32
down, in, and out. If there is any movement, replace the torque arm.
2. Inspect the rubber bushing ends. Replace the
torque arm if there are gaps between the rubber
bushing and the pin or the outer steel sleeve, if
either bushing end contacts a torque arm pin
mounting bolt, if there are cracks in the bushing,
or if part of the rubber bushing extends beyond
the outside diameter of the outer bushing sleeve.
Chalmers Suspension Checking
Chock the front wheels to prevent the vehicle from
moving. Place the transmission in neutral, and release the spring or driveline brakes before inspecting
the rear suspension.
Suspension
4. Manipulate the walking beam so that a micrometer, vernier, or dial caliper can be used to determine the wear area thickness on the bottom
face. See Fig. 8. Measurements should be taken
a minimum of 1/2 inch (13 mm) from the beam
flange edges to eliminate any edge wear that
may have occurred. Subtract the wear area
thickness (see Fig. 8, Ref. B), from the non-wear
area (see Fig. 8, Ref. A), to determine the
amount of wear.
If the beams show any wear greater than the
allowable 0.062-inch (1.5-mm) wear, a Chalmers
wear plate must be installed, or the walking
beam must be replaced. See Group 32 of the
Acterra® Workshop Manual for repair and replacement instructions.
Power wash the Chalmers rear suspension, or clean
it with a hard-bristle brush before performing a visual
inspection.
1
1. Inspect the rubber bushings for cracks or other
damage.
Try to move the torque rod ends using your
hands only, and check for any free-play. If freeplay is felt, replace the torque rod end bushing.
Do not use a pry bar to check for free-play. Use
of a pry bar may lead to premature bushing replacement. See Group 32 of the Acterra® Workshop Manual for replacement instructions.
A
2. If equipped with optional shock absorbers, check
for worn, broken, or damaged shock bushings,
heavy corrosion on the shock absorber body, or
fluid leaking from the shock absorber. Replace
the shock absorbers if any of these conditions
are found; see Group 32 of the Acterra® Workshop Manual.
3. Lift the rear of the vehicle and support the frame
on jack stands to unload the suspension components. The vehicle is lifted high enough when the
beam ends are off of the saddles. All jack stands
must be of sufficient strength and rigidity to
safely support the vehicle. Do not perform any
work on or around a vehicle that is supported
solely by a lifting device.
Visually inspect the walking beam for cracks, or
other damage. If damage is found, see Group
32 of the Acterra® Workshop Manual for replacement instructions.
Keep the vehicle supported by the jack stands
for the next operation.
32/6
B
09/27/95
f320432
A. Non-Wear Area
B. Wear Area
1. Walking Beam
Fig. 8, Walking Beam End Wear Thickness
5. Rotate the restrictor cans 360 degrees and inspect the cans for cracks, severe corrosion, and
distortion. If any of these conditions are present,
or the restrictor can is missing, replace the restrictor can. See Group 32 of the Acterra® Workshop Manual for replacement instructions.
Acterra Maintenance Manual, September 2002
32
Suspension
WARNING
Replace all cracked or missing restrictor cans.
Failure to do so could lead to loss of vehicle control, which could result in property damage, serious personal injury or death. Vehicles with
cracked or missing restrictor cans may be driven
slowly to the nearest workshop for restrictor can
replacement.
6. Remove the jack stands, then lower the vehicle.
Check that the spring, or driveline brake is applied, then remove the wheel chocks.
Reyco 79KB Suspension Visual
Inspection
The Reyco 79KB suspension requires minimal maintenance. To provide trouble-free operation in overthe-road applications, do the following inspection.
1. Park the vehicle on level ground. Apply the parking brakes, and chock the tires.
2. Check that the torque rod clamps are directed
away from the spring to prevent possible interference during operation. See Fig. 9.
3. Check the fit of springs to hangers to ensure
good ride characteristics.
1
4. Check for elongated holes in the suspension
components. See Group 32 of the Acterra®
Workshop Manual for proper repair procedures.
5. Check bushing condition. Replace any bushing
that is worn, cracked, dry-rotted, or otherwise
damaged. See Group 32 of the Acterra® Workshop Manual for removal and installation instructions.
6. Check tire condition. If abnormal tire wear is
found, check and replace all worn or damaged
components, and check suspension alignment.
See Group 32 of the Acterra® Workshop Manual
for component removal and installation procedures, and for suspension alignment instructions.
Reyco 79KB Fastener Torque
Check
Check the U-bolt nuts, hanger mounting bolts, torque
rod clamp nuts, and the spring retainer bolts for
proper fastener torque.
1. Park the vehicle on level ground. Apply the parking brakes, and chock the tires.
2. Use a click-type torque wrench to check that
U-bolt nuts are tightened 400 to 450 lbf·ft (540 to
610 N·m).
2
1
01/04/96
1. Torque Rod Clamp
f320488
2. Torque Rod
Fig. 9, Reyco 79KB Torque Rod Clamp Position
Acterra Maintenance Manual, September 2002
32/7
32
Suspension
3. Use a click-type torque wrench to check that
spring hanger bolts are tightened 190 lbf·ft (258
N·m).
4. Use a click-type torque wrench to check that the
5/8-inch torque rod clamp nuts are tightened 125
to 150 lbf·ft (170 to 203 N·m).
5. Use a click-type torque wrench to check that the
two end-nuts for each torque rod are tightened
400 to 450 lbf·ft (540 to 610 N·m).
6. Use a click-type torque wrench to check that
spring retainer bolts are tightened 60 to 80 lbf·ft
(81 to 109 N·m).
32–02 Suspension Lubricating
Sterling Spring Front Suspension
Wipe all dirt from the grease fittings at the forward
spring pin and the spring shackle pins; then apply
multipurpose chassis grease with a pressure gun
until the old grease is forced out.
10/05/94
f320268a
Fig. 10, Forward Spring Bracket Spring Pin Grease
Fitting (vehicles built before September 15, 2002)
1
Sterling Spring Rear Suspension
Single Axle
A
Lubricate the spring pin by applying multipurpose
chassis grease at the grease fitting. See Fig. 10. Lubricate with a grease gun until grease appears at the
base of the fitting.
Tandem Axle
1
CAUTION
If the equalizer cap and tube assembly is
equipped with a nonrelief grease fitting, excessive
lubrication can damage the bushings.
Lubricate the equalizer cap-and-tube assembly bushings by applying multipurpose chassis grease at the
pressure-relief grease fitting. See Fig. 11. Lubricate
with a hand gun or pressure gun until grease is
forced out from the base of the pressure-relief fitting.
05/27/93
320020a
A. Lubricate here.
1. Cap-and-Tube Assembly Bushing
Fig. 11, Equalizer Assembly Lubrication
Hendrickson Equalizer-Beam
End Bushings and Rubber
Center Bushings
No lubrication is required for the equalizer-beam end
bushings or equalizer-beam rubber center bushings.
32/8
Acterra Maintenance Manual, September 2002
32
Suspension
Hendrickson Spring-Eye Pins,
RT and RTE Series
NOTE: See Fig. 7 for this procedure.
Apply multipurpose chassis grease at the spring eye
pin grease fitting (located on the inboard side of the
spring eye pin) until clean grease appears at both
ends of the spring eye pin.
Freightliner TufTrac
The TufTrac suspension is maintenance-free and designed so that lubrication is not required. There are
no provisions for lubrication and attempting to lubricate the suspension could shorten component life.
CAUTION
Failure to retorque the U-bolt nuts could result in
spring breakage and abnormal tire wear.
1. Park the vehicle on a flat surface and apply the
parking brakes. Chock the tires to prevent the
vehicle from moving.
2. Check the U-bolt torque in a diagonal pattern.
Set a click-type torque wrench to the highest
torque value for the fastener being checked. See
Table 1 for U-bolt torque specifications. Turn the
wrench in a clockwise motion (looking up) until
the torque wrench clicks.
3. Remove the chocks.
32–03 U-Bolt Torque Checking
Check the U-bolt torque of both the front and rear
axles (where applicable).
U-Bolt Torque Values
Description
Torque:
lbf·ft (N·m)
Size
5/8–18
Stage
Stage
Stage
Stage
1:
2:
3:
4:
Hand Tighten
60 (81)
200 (271)
180 to 230 (245 to 313)
3/4–16
Stage
Stage
Stage
Stage
1:
2:
3:
4:
Hand Tighten
60 (81)
200 (271)
270 to 330 (367 to 449)
7/8–14
Stage
Stage
Stage
Stage
1:
2:
3:
4:
Hand Tighten
60 (81)
200 (271)
420 to 500 (571 to 680)
1–14
Stage
Stage
Stage
Stage
1:
2:
3:
4:
Hand tighten
60 (81)
200 (271)
520 to 600 (707 to 816)
Spring Assembly U-Bolt High Nuts*
* Tighten in a diagonal pattern as shown in Fig. 12.
Table 1, U-Bolt Torque Values
Acterra Maintenance Manual, September 2002
32/9
32
01/05/99
Suspension
4
1
2
3
f320783
Fig. 12, Tightening Pattern for U-Bolt High Nuts
32/10
Acterra Maintenance Manual, September 2002
Front Axle
33
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
All-Axle Alignment Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33–04
All-Wheel-Drive Front Axle Oil Changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33–06
All-Wheel-Drive Front Axle Oil Level Checking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33–05
Draw Key Nut Inspecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33–07
Knuckle Pin Lubricating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33–01
Tie Rod End Inspecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33–02
Tie Rod End Lubricating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33–03
Acterra Maintenance Manual, September 2002
33
Front Axle
33–01 Knuckle Pin Lubricating
Standard Meritor Axles
out through it during lubrication. Even if grease leaks
out around the top or bottom plate gasket, continue
pumping until new grease is seen at the seal on the
bushing opposite the grease fitting.
Hold a pressure gun on each fitting until fresh grease
appears. See Fig. 1. This will ensure that all the old
contaminated grease has been forced out. It is not
necessary to exceed 4000 psi (27 560 kPa). The
best distribution of new lubricant and the best purging of old lubricant occurs when about 4000 psi (27
560 kPa) pressure is applied at the grease gun
nozzle. Using a 40 to 1 booster, the air should be
limited to 100 psi (689 kPa); using a 50 to 1 booster,
the air should be limited to 80 psi (551 kPa). Higher
or lower pressures are not recommended.
When lubricating knuckle pin bushings at M1 through
M5, do not raise the front axle. Wipe the lube fittings
clean, and apply multipurpose chassis grease until
new grease is seen at the grease seal on the bushing opposite the fittings. The grease seal will accept
the grease pressure without damaging the seal, and
is designed to have grease pumped out through it
during lubrication. Even if grease leaks out around
the top or bottom plate gasket, continue pumping
until new grease is seen at the seal on the bushing
opposite the grease fitting.
Sealed and Easy Steer™ Axle
Kingpins
1
NOTE: This procedure applies to the following
axles:
• MFS-8-153B
A
• MFS-10-143A
• MFS-12-143A
• MFS-13-143A
• MFS-14-143A
• MFS-16-143A
• MFS-18-133A
09/06/96
1
f320032a
A. Pump lubricant into each grease fitting until fresh
grease comes out here.
1. Grease Fitting
Fig. 1, Meritor Front Axle
When lubricating knuckle pin bushings for Initial
Maintenance, raise the front axle until the front tires
are off the ground. Wipe the lube fittings clean, and
slowly feed multipurpose chassis grease (NLGI grade
1 or 2) into each bushing area while turning the
wheels from extreme right to left and back again
(lock to lock). This will eliminate small air pockets
and improve grease distribution.
Lower the tires to the ground, and regrease both top
and bottom bushings until new grease is seen at the
seal on the bushing opposite the fittings. The grease
seal will accept the grease pressure without damaging the seal, and is designed to have grease pumped
Acterra Maintenance Manual, September 2002
• MFS-20-133A
• 975 Series Easy Steer sealed front axles
Refer to the identification tag on the front of the
axle beam.
On sealed and Easy Steer™ front axle, the grease
fittings are on the top and bottom kingpin caps of the
knuckle.
1. Shut off the engine, apply the brakes, and chock
the rear tires.
2. Make sure the tires touch the ground. Do
notraise the vehicle.
3. Clean off all grease fittings prior to lubrication.
IMPORTANT: Meritor recognizes that industry
trends are moving toward increased selection
and usage of synthetic grease in vehicle maintenance. However, some seals are known to ex-
33/1
33
Front Axle
pand when in contact with synthetic grease.
Consult your local Meritor representative for
synthetic grease application references before
using any synthetic grease when performing
axle service and maintenance.
4. Using a multipurpose grease, NLGI grade 1 or 2,
lubricate the kingpins through the grease fittings
on the top and bottom of the knuckle. See
Fig. 2.
1
2. Make sure the tires touch the ground. Do
notraise the vehicle.
3. Clean off all grease fittings prior to lubrication.
IMPORTANT: Meritor recognizes that industry
trends are moving toward increased selection
and usage of synthetic grease in vehicle maintenance. However, some seals are known to expand when in contact with synthetic grease.
Consult your local Meritor representative for
synthetic grease application references before
using any synthetic grease when performing
axle service and maintenance.
4. Using a multipurpose grease, NLGI grade 1 or 2,
lubricate the kingpins through the grease fittings
on the top and bottom of the knuckle. See
Fig. 3.
A
1
A
10/10/2001
f330185
A. Apply lubricant until new lubricant comes from these
areas.
1. Grease Fitting
Fig. 2, Sealed, Easy Steer Kingpin Lubrication
5. Apply lubricant until new lubricant comes from
the thrust bearing seal and the upper shim pack.
6. Remove the chocks from the tires.
Easy Steer Plus™–Axles With
Unitized Wheel Ends, King Pins
1
10/11/2001
f330184
A. Apply lubricant until new lubricant comes from these
areas.
1. Grease Fitting
Fig. 3, Sealed, Easy Steer Plus Kingpin Lubrication
5. Force lubricant into the upper and lower kingpin
grease fitting caps until new lubricant flows from
between the upper axle beam end and the
knuckle and between the lower axle beam end
and the knuckle. See Fig. 3.
NOTE: This procedure applies to Easy Steer
Plus™ MFS 10-12-143D sealed front axles.
Refer to the identification tag on the front of the
axle beam.
6. Remove the chocks from the tires.
On Easy Steer Plus front axles, the grease fittings
are on the top and bottom kingpin caps of the
knuckle.
IMPORTANT: If the tie rod end boot is torn or
missing, replace the entire tie rod end. Do not
replace the boot only.
33–02 Tie Rod End Inspecting
1. Shut off the engine, apply the brakes, and chock
the rear tires.
33/2
Acterra Maintenance Manual, September 2002
33
Front Axle
1. Shut off the engine, apply the brakes, and chock
the rear tires.
2. Check the tie rod boot for cracks, tears, or other
damage. If the tie rod boot is damaged, replace
the entire tie rod end.
3. Grasp by hand (or use a pipe wrench with jaw
protectors to avoid gouging the cross tube) and
slightly rotate the cross tube toward the front of
the vehicle and then slightly toward the rear.
Then center the cross tube between the stop positions. If the cross tube does not rotate in either
direction, replace both tie rod ends.
5. Check the cross tube for cracks or other damage. If the cross tube is bent or damaged, replace the cross tube.
6. Check the clamps for damage. If a clamp is
damaged, replace the clamp. Replace the entire
cross tube assembly if either clamp is welded to
the cross tube.
7. Check for proper installation of the tie rod end
clamp to the cross tube. Make sure that the tie
rod ends are threaded in the cross tube past the
clamps and the slots at the cross tube ends. See
Fig. 5.
4. Position yourself directly below the ball stud
socket. Using both hands, grab the end as close
to the socket as possible, no more than 6 inches
(15.2 cm) from the end. Firmly apply about 100
pounds of hand pressure in an up and down motion several times. When moving the assembly,
check for any movement at both tie rod ends.
See Fig. 4.
OK
If any movement is detected at one tie rod end,
replace both tie rod ends. Always replace tie rod
ends in pairs, even if only one tie rod end is
damaged.
1
OK
f320033a
02/27/2007
NOTE: Pinch bolt not shown to provide clarity.
1. Cross-Tube Split
Fig. 5, Tie-Rod End Adjustment
10/10/2001
f330195
Fig. 4, Check Movement of Tie Rod End
CAUTION
Do not attempt to straighten a bent cross tube.
Doing so could result in damage to the axle. Be
sure to replace the cross tube with an original
equipment cross tube with the same length, diameter, and thread size as the existing cross tube.
Acterra Maintenance Manual, September 2002
8. Check the zerk fittings for damage. If a zerk fitting is damaged, replace it.
Some tie rod ends have no zerk fittings because
they are not to be greased. Do not install a zerk
fitting on this type of tie rod end.
9. Check that the cotter pin is in place. If it is not,
tighten the tie rod end nut to one of the following
specs depending on the size of the stud.
• 7/8–14, 160 to 300 lbf·ft (217 to 406 N·m)
• 1–14, 250 to 450 lbf·ft (339 to 610 N·m)
33/3
33
Front Axle
• 1-1/8–12, 350 to 650 lbf·ft (475 to 881
N·m)
• 1-1/4–12, 500 to 675 lbf·ft (678 to 915
N·m)
10. Check the steering arm bolts for a minimum
torque of 300 lbf·ft (406 N·m). If the steering arm
bolt torque has fallen below this specification,
remove the bolt, clean all the threads, and apply
new Loctite® 680. Tighten the bolt 300 to 450
lbf·ft (406 to 610 N·m).
33–04 All-Axle Alignment
Checking
Drive Axle Alignment Checking
Check the axle alignment, parallelism, and thrust
angle measurements for the rear drive axles. Use the
applicable procedure and specifications in Group 35
of the Acterra® Workshop Manual.
11. Remove the chocks from the tires.
Toe-In Checking, Front Axle
33–03 Tie Rod End Lubricating
See Group 33 of the Acterra® Workshop Manual for
wheel alignment procedures.
This procedure applies to all tie rod ends on Meritor
nondrive steering axles.
1. Park the vehicle with the wheels in the straightahead position. Turn off the engine, apply the
brakes and chock the rear tires.
2. Wipe the zerk fitting and the seal or boot clean.
33–05 All-Wheel-Drive Front
Axle Oil Level Checking
1. On all front-wheel-drive vehicles, check the oil
level in the differential. See Fig. 6.
NOTE: Synthetic lubricants are not approved for
tie rod end lubrication.
3. Using a grease gun, apply a multipurpose
grease, NLGI grade 1 or 2, to the zerk fitting until
all the old grease is purged from the boot. Discolored old grease should come out of the purge
holes near the boot crimp or bellows area.
1
Apply grease until all the old grease is purged
from the boot.
2
NOTE: If using an air pressure grease gun, do
not exceed 150 psi (1035 kPa).
4. If the tie rod end is designed for lube service and
it does not accept grease, perform the following
substeps.
4.1
Remove the zerk fitting.
4.2
Inspect the threaded zerk fitting hole in
the tie rod end and remove any obstructions.
4.3
Install a new zerk fitting.
4.4
Apply lubrication to the new zerk fitting.
04/15/96
f350149
1. Vent Valve
2. Oil Level Check-and-Fill Plug
3. Oil Drain Plug
Fig. 6, All-Wheel-Drive Front Axle Differential
1.1
Remove the oil level check-and-fill plug,
and make sure the oil level is even with
the bottom of the bore.
1.2
If needed, add oil until the differential is
filled to the bottom of the bore.
1.3
Install the oil level check-and-fill plug, and
tighten it firmly.
5. Remove the chocks from the tires.
33/4
3
Acterra Maintenance Manual, September 2002
33
Front Axle
2. On front-wheel-drive vehicles equipped with MT14, MT-17, and MT-22 axles, check the oil level
in the hubs.
2.1
The oil drain bore must be at the bottom
in order to check the oil level. See Fig. 7.
MH
On vehicles equipped with an MT-14, MT-17, or
MT-22 front axle, drain the oil from the differential
and the hubs.
3.1
Remove the oil-drain plug from the differential, and allow the oil to drain. See
Fig. 6.
3.2
If applicable, rotate each wheel until the
oil drain bore is at the bottom, then remove the drain bore plugs and allow the
oil to drain into a suitable container. See
Fig. 7. If needed use a bent piece of
sheet metal to direct the draining oil so it
doesn’t splash on the tires.
4. Fill the differential and hubs (if applicable) with
new oil.
A
4.1
Install the drain bore plugs in each hub
and the differential, then tighten the plugs
firmly.
4.2
Remove the plug from the oil level check
bore in each hub and from the fill-andcheck bore in the differential.
4.3
Fill the hubs and differential until the oil
level within each is even with the bottom
of the fill-and-check bore.
4.4
Install the check bore plug in each hub
and install the fill-and-check plug in the
differential. Tighten all the plugs firmly.
1
2
f350148
04/10/96
A. Correct Oil Level
1. Oil Level Checking
Bore
2. Oil Drain Bore
Fig. 7, All-Wheel-Drive Front Axle Hub, MT-17 Axles
2.2
Remove the plug from the oil level checking bore, and make sure the oil is level
with the bottom edge of the bore.
2.3
If needed, add oil until each axle hub is
filled to the bottom of the bore.
2.4
Install the plug in each oil level checking
bore, and tighten it firmly.
33–06 All-Wheel-Drive Front
Axle Oil Changing
5. Lift the front axle off the jack stands, remove the
stands and lower the vehicle to the ground. Then
remove the chocks from the rear tires.
33–07 Draw Key Nut Inspecting
Axles With Unitized Wheel Ends
Check the torque of the nut that holds the draw key
on the side of the knuckle. The torque should be 30
to 45 lbf·ft (41 to 61 N·m). See Fig. 8.
1. Drive the vehicle until the axle oil is warmed,
then park it, and chock the rear tires.
2. Jack up the front axle until the wheels are off the
ground, then secure the axle on jack stands.
3. On vehicles equipped with an MT-8, MT-10, or
MT-11 front axle, drain the oil from the differential.
Acterra Maintenance Manual, September 2002
33/5
33
Front Axle
10/11/2001
f330186
Fig. 8, Draw Key Nut
33/6
Acterra Maintenance Manual, September 2002
Rear Axle
35
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Axle Breather Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35–02
Axle Lubricant Changing and Magnetic Plug Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35–03
Axle Lubricant Level Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35–01
Two-Speed-Axle Shift Unit Oil Changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35–05
Two-Speed-Axle Shift Unit Oil Level Checking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35–04
Acterra Maintenance Manual, March 2000
35
Rear Axle
35–01 Axle Lubricant Level
Checking
NOTE: Some Meritor axles have a small tapped
and plugged hole located near and below the
housing oil fill hole. This smaller hole is for the
lubricant temperature sensor only, and must not
be used as a fill or level hole.
CAUTION
2. With the vehicle on level ground, lubricant must
be level with the bottom of the oil fill hole.
Failure to keep the rear axle filled to the proper
level with the recommended lubricant can result in
rear axle damage.
If low, add lubricant. See Table 1 for approved
axle lubricants and see Table 2 or Table 3 for
axle capacities.
1. Clean the oil fill hole plug, located in the carrier
or the side of the axle housing, and the area surrounding it (see Fig. 1). Remove the plug.
Meritor Drive Axle Recommended Lubricant
Recommended
Lubricant Type
Hypoid Gear Oil
API Service
Classification GL–5
Synthetic Gear Oil
–40°F (–40°C) and up*
Ambient Temperature
Lubricant SAE
Viscosity Grade
Meritor
Specification
+10°F (–12.2°C) and up*
85W–140
0–76–A
–15°F (–26.1°C) and up*
80W–140
0–76–B
–15°F (–26.1°C) and up*
80W–90
0–76–D
–40°F (–40°C) and up*
75W–90
0–76–E
–40°F (–40°C) to +35°F (+2°C)
75W
0–76–J
–40°F (–40°C) and up*
75W–140
0–76–L
–40°F (–40°C) and up*
75W–90
0–76–N
75W–140
0–76–M
* There is no upper limit on these ambient temperatures, but axle sump temperature must never exceed 250°F (121°C).
Table 1, Meritor Drive Axle Recommended Lubricant
Meritor Drive Axle Lubricant Capacities, Single Axles
Axle Type
Single†
Axle Model
Capacity*:
pints (liters)
Axle Model
Capacity*:
pints (liters)
RS–13–120
RS–15–120
16 (7.6)
RS–19–220
31 (14.7)
16 (7.6)
RS–21–145
32 (15.1)
RS–15–210
16 (7.6)
RS–21–160
39.5 (18.7)
RS–21–230
39 (18.5)
RS–23–160
42 (19.9)
RS–23–240
45 (21.3)
RS–17–140
31 (14.7)
RS–17–145
33.6 (15.9)
RS–17–220
31 (14.7)
RS–19–145
34.4 (16.3)
Axle Type
Single†
* Quantities listed are approximate and include 1 pint (0.5 liter) for each wheel end and with the drive pinion at 3 degrees.
† Single drive axles equipped with traction equalizers may require a "friction modifier" to correct a slip-stick condition, as described in the vehicle driver’s
manual. Meritor’s experience shows that the following additives perform adequately: Add Elco No. 2 Friction Modifier (1 ounce [30 ml] of additive for each 1 pint
[0.5 liter] of lube capacity) or Lubrizol No. 797 or 762 (1 ounce [30 mL] of additive for each 1 pint [0.5 liter] of lube capacity).
Table 2, Meritor Drive Axle Lubricant Capacities, Single Axles
Acterra Maintenance Manual, March 2000
35/1
35
Rear Axle
Meritor Drive Axle Lubricant
Capacities, Tandem Axles
Capacity*: pints (liters)
Axle Model
RT–34–144
Forward 29.8 (14.1)
Rear 34 (16.1)
RT–40–145
Forward 30.4 (14.4)
Rear 34.4 (16.3)
* Quantities listed are approximate and include 1 pint (0.5 liter) for each
wheel end and with the drive pinion at 3 degrees.
Table 3, Meritor Drive Axle Lubricant Capacities,
Tandem Axles
3. Install the fill hole plug, and tighten it 35 lbf·ft (47
N·m).
35–02 Axle Breather Checking
The axle housing breather (see Fig. 1) must remain
clean. Whenever the axle lubricant level is checked,
check that the axle breather is open. Check more
often under poor operating conditions. If the breather
is plugged, clean or replace it as needed.
1
35–03 Axle Lubricant Changing
and Magnetic Plug
Cleaning
A regular schedule for changing the axle lubricant in
a particular vehicle and operation can be accurately
determined by analyzing oil samples taken from the
axle at specified intervals or mileages. Lubricant suppliers frequently make their laboratory facilities available for determining the useful life of their product
under actual service conditions. The final schedule
that is recommended may, for economic reasons, be
correlated with lubricant changes that are governed
by climatic conditions and magnetic plug maintenance. Change lubricant type and viscosity as climatic temperatures demand, regardless of vehicle
mileage or established change schedule.
The normal operating temperature of compounded
lubricants during the summer season is about 160°
to 220°F (71° to 104°C). The chemicals and additives that give these lubricants increased loadcarrying capacity, oxidize faster at temperatures
above 220°F (104°C), contributing to more rapid lubricant deterioration. For this reason, lubricants of
this type, that operate continuously at high temperatures, must be changed more frequently.
CAUTION
Failure to change the axle lubricant at more frequent intervals, when adverse operating conditions require, could result in axle damage.
Axle Draining and Flushing
2
06/07/94
1. Axle Housing
Breathers
1. Remove the plug at the bottom of the housing
and drain the lubricant while the unit is warm.
Allow enough time for all the old lubricant to
drain completely.
3
f350062a
2. Carrier Oil Fill Plugs
3. Interaxle Differential
Fig. 1, Fill Hole Plug and Axle Housing Breather
Locations
2. Flush the unit with clean flushing oil, then drain it
completely.
IMPORTANT: Do not flush axles with solvent,
such as kerosene.
3. Clean the drain plugs. For magnetic drain plugs,
a piece of key stock or any other convenient
steel slug may be used to short the two magnetic
poles and divert the magnetic field.
35/2
Acterra Maintenance Manual, March 2000
35
Rear Axle
NOTE: Meritor recommends using magnetic
plugs with elements having a minimum pickup
capacity of 2 pounds (1 kg) of low-carbon steel,
in plate or bar form. Magnets will rapidly lose
effectiveness as collected material bridges the
gap between the two poles. Clean or change
the plugs before this occurs. It may be necessary to clean or change the plugs one or more
times between lubrication change intervals.
1
4. After cleaning the drain plugs, install and tighten
them 35 lbf·ft (47 N·m).
Axle Filling
3
1. With the vehicle on a level surface, fill the axle
housings to the bottom of the oil fill hole (in the
carrier or housing) with lubricant. See Table 1 for
approved axle lubricants and see Table 2 or
Table 3 for axle capacities.
NOTE: Meritor axles have a small tapped and
plugged hole located near and below the housing oil fill hole. This smaller hole is for the lubricant temperature sensor only, and must not be
used as a fill or level hole.
2. Install the fill hole plug, and tighten it 35 lbf·ft (47
N·m).
3. After filling the carrier and housing assembly with
lubricant, drive the vehicle, unloaded, for 1 or 2
miles (2 or 3 kilometers) at speeds not to exceed
25 mph (40 km/h), to thoroughly circulate the
lubricant throughout the assembly.
35–04 Two-Speed-Axle Shift
Unit Oil Level Checking
CAUTION
Failure to keep lubricant at the specified level
could cause damage to the axle shift unit.
1. Clean the oil fill hole plug in the shift unit housing
cover, and the area surrounding it. See Fig. 2.
Remove the fill hole plug.
2. The lubricant level should be maintained at the
bottom of the fill hole. If low, add the specified
lubricant.
Acterra Maintenance Manual, March 2000
2
08/06/93
f350021a
1. Housing Cover Gasket
2. Oil Fill Hole Plug
3. Shift Unit Housing Cover
Fig. 2, Two-Speed-Axle Shift Unit
CAUTION
Before adding additional lubricant, make sure of
the type currently in the shift unit. To prevent
component damage, do not mix engine oil with
automatic transmission fluid.
IMPORTANT: When the vehicle operating temperatures are above 0°F (–18°C), use SAE 10
heavy-duty engine oil, API service classification
SD (sulfated ash content must not exceed
1.85%). When the vehicle operating temperatures are below 0°F (–18°C), use one part of
kerosene to three parts of SAE 10 heavy-duty
engine oil, API service classification SD (sulfated ash content must not exceed 1.85%). This
cold-weather mixture can be safely used up to
32°F (0°C).
Commercially available automatic transmission
fluid may be used in place of SAE 10 engine oil.
Automatic transmission fluid can be used for all
temperatures. Do not mix kerosene with automatic transmission fluid.
3. Apply a small amount of Loctite® 242, or equivalent sealant, to the threads of the fill hole plug.
Install the fill hole plug finger-tight; then, using a
wrench, tighten the plug 1-1/2 turns more.
35/3
35
Rear Axle
35–05 Two-Speed-Axle Shift
Unit Oil Changing
1. Remove the shift unit housing cover (see Fig. 2),
and drain the old lubricant. Discard the housing
cover gasket, and the old lubricant.
2. Thoroughly wash the axle shift parts and housing
cover, and allow them to air dry.
3. Install the housing cover and a new housing
cover gasket. Tighten the housing cover capscrews 90 to 110 lbf·in (1020 to 1240 N·cm),
then remove the oil fill hole plug from the cover.
4. Fill the shift unit housing through the oil fill hole
until the specified lubricant is level with the bottom of the opening.
IMPORTANT: When the vehicle operating temperatures are above 0°F (–18°C), use SAE 10
heavy-duty engine oil, API service classification
SD (sulfated ash content must not exceed
1.85%). When the vehicle operating temperatures are below 0°F (–18°C), use one part of
kerosene to three parts of SAE 10 heavy-duty
engine oil, API service classification SD (sulfated ash content must not exceed 1.85%). This
cold-weather mixture can be safely used up to
32°F (0°C).
Commercially available automatic transmission
fluid may be used in place of SAE 10 engine oil.
Automatic transmission fluid can be used for all
temperatures. Do not mix kerosene with automatic transmission fluid.
5. Apply a small amount of Loctite 242, or an
equivalent sealant, to the threads of the oil fill
hole plug. Install the oil fill hole plug finger-tight;
then, using a wrench, tighten the plug 1-1/2 turns
more.
35/4
Acterra Maintenance Manual, March 2000
Wheels and Tires
40
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Wheel Nut Checking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40–01
Acterra Maintenance Manual, March 2000
40
Wheels and Tires
40–01 Wheel Nut Checking
CAUTION
IMPORTANT: In addition to the maintenance
interval in this manual, check the wheel nut
torque the first 50 to 100 miles (80 to 160 km)
of operation after a wheel has been removed
and installed.
Too little wheel nut torque can cause wheel
shimmy, resulting in wheel damage, stud breakage, and extreme tire tread wear. Too much wheel
nut torque can break studs, damage threads, and
crack discs in the stud hole area.
When checking wheel nuts on a dual disc assembly,
remove one outer nut at a time, tighten the inner nut,
then reinstall the outer nut. Repeat this procedure for
all of the inner wheel nuts in the sequence shown in
Fig. 1, then tighten all of the outer wheel nuts in the
same sequence.
See Table 1, Table 2, or Table 3 for wheel nut
torque specifications.
Fastener Torque for 10-Hole Disc Wheel
With Inner and Outer Locknuts
Description
Wheel
Manufacturer
Nut Size
Front Wheel Nut
Torque (dry threads):
lbf·ft (N·m)
3/4–16, 1-1/8–16 Accuride
450–500 (610–680)
Rear Wheel Inner Nut
3/4–16
Accuride
450–500 (610–680)
Rear Wheel Outer Nut
1-1/8–16
Accuride
450–500 (610–680)
3/4–16
Accuride
175–200 (235–270)
Wheel Stud Retainer Nut
Table 1, Fastener Torque for 10-Hole Disc Wheel With Inner and Outer Locknuts
Fastener Torque for 8-Hole Disc Wheel
With Cone Locknuts
Description
Nut Size
Torque (lubricated threads):
lbf·ft (N·m)
M20
280–310 (380–420)
Front and Rear Wheel Nuts
Table 2, Fastener Torque for 8-Hole Disc Wheel With Cone Locknuts
Spoke-Type Wheel Fastener Torque
Description
Size
Wheel
Manufacturer
Torque (dry threads):
lbf·ft (N·m)
Front Wheel Nut, 5- and
6-Spoke
3/4–10
Gunite
200–225 (270–305)*
Rear Wheel Nut, 5- and
6-Spoke With Channel Spacer
3/4–10
Gunite
200–225 (270–305)
Rear Wheel Nut, 5- and
6-Spoke With Corrugated
Channel Spacer
3/4–10
Gunite
240–260 (325–350)
* On front axles with over 12,000 lbs (5448 kg) capacity, tighten the wheel nuts 240 to 265 lbf·ft (325 to 359 N·m).
Gunite part number W–854 nut with a phosphate and oil coating must be used.
Table 3, Spoke-Type Wheel Fastener Torque
Acterra Maintenance Manual, March 2000
40/1
40
Wheels and Tires
2
1
10
7
4
5
6
8
3
A
1
1
1
8
3
3
6
5
4
6
3
5
7
4
9
2
B
5
2
2
C
D
f400057
05/27/93
A. 8-Stud Disc Wheel
B. 10-Stud Disc Wheel
4
C. 6-Spoke Wheel
D. 5-Spoke Wheel
Fig. 1, Wheel Nut and Rim Nut Tightening Sequence
40/2
Acterra Maintenance Manual, March 2000
Driveline
41
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Driveline Inspecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41–01
Driveline Lubricating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41–02
Acterra Maintenance Manual, March 2000
41
Driveline
41–01 Driveline Inspecting
End-Yoke Nut Torque Specifications
Description
Inspecting
1. Check that the yoke-strap capscrews (see Fig. 1,
Ref. 4) are tightened as follows:
• Dana Spicer 1590 and 1610: 50 to 60 lbf·ft
(68 to 81 N·m)
• Dana Spicer 1710: 125 to 135 lbf·ft (170 to
183 N·m)
CAUTION
Do not overtighten the yoke-strap capscrews, due
to the extreme load occurring at high-speed rotation. A loose or broken capscrew at any point in
the driveline weakens the driveline connection,
which could eventually result in serious vehicle
damage.
2. Check each of the output and input end yokes
(see Fig. 1, Refs. 2 and 11) for cracks and
looseness. Replace cracked yokes. If any end
yoke can be moved in or out on its shaft, or can
be rocked on its shaft, disconnect the driveshaft
and U-joint from the end yoke. Check the drive
component’s shaft seal for leakage or other visible damage that may have been caused by the
loose yoke. Replace the seal if needed. Tighten
the end-yoke nut to the value in Table 1. If the
end yoke is still loose after tightening the yoke
nut, install a new yoke and yoke nut.
NOTE: If the end-yoke locknut was removed for
any reason, install a new one.
3. Check the U-joint assemblies for wear by attempting to move the driveshaft up and down,
and from side to side. If movement of the U-joint
trunnion in the bearings is greater than 0.006
inch (0.15 mm), replace the U-joint assembly.
4. Check the midship bearing and bracket for looseness and deterioration by attempting to move the
driveshaft up and down, and from side to side. If
the bearing is loose on its shaft, or rattles, replace it. If the bearing bracket is loose on the
frame, or the bearing mount is loose on the
bracket, tighten the mounting bolt nuts 91 lbf·ft
(123 N·m). Replace the midship bearing assembly if the rubber cushion is worn or oil-soaked.
Acterra Maintenance Manual, March 2000
Thread Size
Torque:
lbf·ft (N·m)
Transmissions
Allison AT-545
Allison MD Series
1/2–20*
100–120
(140–160)
2–16
600–800
(815–1085)
Single Axle Input Shaft
Meritor RS–13–120,
RS–15–120 and –210,
RS–17–140 and –20,
RS–19–145 and –220,
and
RS–21–145 and –230
M32 x 1.5
740–920
(1000–1250)
Meritor RS–23–160
M45 x 1.5
1000–1230
(1355–1670)
Meritor RS–23–240
M39 x 1.5
920–1130
(1250–1530)
Tandem Axle Input and Output Shafts
Meritor
RD– and RR–17–145,
(of RT–34–145), and
RD– and RR–20–145
(of RT–40–145)
M39 x 1.5
920–1130
(1250–1530)
Coupling Shaft (Midship Bearings)
Dana Spicer 1590, 1610,
and 1710
1-1/4–18
475–525
(644–712)
* The Allison AT-545 transmission output shaft end-yoke is retained by a
1/2-20 x 1-1/2-inch bolt and a 1-1/16-inch washer. Both the bolt and the
washer must be replaced each time they are removed.
Table 1, End-Yoke Nut Torque Specifications
5. Check the slip-joints for spline wear by trying to
bend the sleeve-yoke and splined shaft back and
forth (see Fig. 2). If looseness is greater than
0.007 inch (0.18 mm), replace both the sleeveyoke and the splined shaft.
6. Check the driveshaft tubes for dents, bends,
twists, or other damage. If any tube appears to
be damaged, remove the driveshaft and check
the runout on the tube. If the tube is not straight
(and cannot be straightened) within 0.015 inch
(0.38 mm) on the slip-joint seal surface of the
splined shaft, 0.020 inch (0.51 mm) on the tube
3 inches (76 mm) from the front and rear welds,
and 0.025 inch (0.635 mm) at the center of the
tube, replace the tube. See Fig. 3.
41/1
41
Driveline
12
2
6
5
4
3
1
10
11
2
9
8
4
13
7
14
7
17
15
16
18
3
10/06/94
f410057a
NOTE: Not all fasteners are shown.
1.
2.
3.
4.
5.
6.
7.
Transmission
Half-Round End Yoke
U-Joint Assembly
Yoke Strap and Capscrew
Coupling Shaft
Midship Bearing and Mount
Bearing Cup
8.
9.
10.
11.
Slip-Joint Assembly
Driveshaft Tube
Driveshaft Yoke
Input Shaft Half-Round End
Yoke
12. Rear Axle
13.
14.
15.
16.
17.
18.
Splined Shaft
Dust Seal
Sleeve Yoke
Full-Round-Yoke Lug
U-Joint Cross
Lockplate and Capscrew
Fig. 1, Driveline Assembly With Midship Bearing for Single-Axle Installation
If the driveshaft tube requires straightening or
replacement, balance the repaired driveshaft before installing it. See Group 41 of the Acterra®
Workshop Manual.
7. Check the driveshaft for missing balance
weights, and for debris build-up. Remove any
build-up. If any balance weights are missing, remove the driveshaft and have it balanced; see
Group 41 of the Acterra® Workshop Manual.
8. For driveshafts with slip-joints, check that the
yoke plug is not loose or missing. See Fig. 4,
Ref. 2. Replace the yoke plug if needed. If the
yoke plug is missing, the splined shaft may be
41/2
hitting the yoke plug and knocking it out; check
the driveshaft for proper length.
41–02 Driveline Lubricating
U-Joint Lubricating
1. Wipe all old grease and dirt from each U-joint
grease fitting. See Fig. 4, Ref. 8.
2. Use a hand-type grease gun, or a high-pressure
gun with a low-pressure adapter, to lubricate the
U-joints.
Acterra Maintenance Manual, March 2000
41
Driveline
5
1
2
f410012a
05/27/93
7
3
4
3
6
Attempt to bend the sleeve yoke and splined shaft back
and forth.
8
Fig. 2, Slip-Joint Spline Wear Checking
3
1
A
A
A
B
C
D
C
f410110b
06/13/96
A.
B.
C.
D.
Measurement:
Measurement:
Measurement:
Measurement:
3" (76 mm)
0.015" (0.38 mm)
0.020" (0.51 mm)
0.025" (0.635 mm)
Fig. 3, Driveshaft Runout Specifications
NOTE: If a low-pressure adapter is not used
with the high-pressure gun, the U-joints may not
receive enough lubricant.
3. Using lithium 12-hydroxy stearate grease (NLGI
grade 1 or 2, with EP additives), lubricate until
new grease can be seen at all four U-joint seals.
IMPORTANT: Fresh lubricant must be seen escaping from all four bearing cup seals of each
U-joint.
On full-round yokes, if most of the grease being
added to a U-joint can be seen escaping from
just one of the U-joint seals, bend the tabs of
the lockstrap away from the heads of the bearing cup capscrews, then check the torque on
the bearing cup capscrews at that seal. Tighten
the bearing cup capscrews as follows:
Acterra Maintenance Manual, March 2000
f410050a
10/20/93
A. After grease appears, cover the pressure-relief hole
while continuing to lubricate.
5. Yoke Plug Pressure1. Slip-Joint Grease
Relief Hole
Fitting (with grease
6. Slip-Joint Seal
gun attached)
7. Full-Round Yoke
2. Yoke Plug
8. U-Joint Grease Fitting
3. Grease
4. Half-Round Yoke
Fig. 4, Slip-Joint and U-Joint Lubricating
• 5/16–24 capscrews: 24 lbf·ft (32 N·m)
• 3/8–24 capscrews: 37 lbf·ft (50 N·m)
Bend the lockstrap tabs up, against a flat side of
each capscrew. If the capscrews were already
tight, or all of the U-joint seals still do not purge,
remove the bearing cup at that seal, and examine the seal for damage. If the seal is damaged,
replace the complete U-joint assembly.
If grease does not appear at one of the seals,
use a screwdriver to pry the U-joint trunnion
away from the non-purging seal, or tap the
driveshaft or yoke with a plastic or rawhide mallet (on the side opposite the dry seal), while
continuing to apply gun pressure. If grease still
does not appear, bend the tabs of the lockstrap
away from the heads of the bearing cup cap-
41/3
41
Driveline
screws, then loosen the bearing cup capscrews
(at the bearing with the dry seal) to relieve seal
tension. Lubricate the U-joint until the old
grease is purged, then tighten the capscrews to
the above specifications, and bend the tabs of
the lockstrap against a flat side of each capscrew. If the bearing will not take grease, replace the U-joint assembly; see Group 41 of the
Acterra® Workshop Manual.
4. Check the old grease. If it appears rusty, gritty, or
burned, replace the U-joint assembly. See Group
41 of the Acterra® Workshop Manual.
5. Wipe any excess grease from the seals and
grease fittings.
Slip-Joint Spline Lubricating
1. Wipe all old grease and dirt from the slip-joint
grease fitting. See Fig. 4, Ref. 1.
2. Use a hand-type grease gun or a high-pressure
gun with a low-pressure adapter, to lubricate the
slip-joint. Using lithium 12 hydroxy stearate
grease (NLGI grade 1 or 2, with EP additives),
lubricate until fresh grease appears at the
pressure-relief hole in the yoke plug. Then cover
the relief hole with your finger, while continuing
to lubricate until fresh grease appears at the slipjoint seal (see Fig. 4, Ref. 6). This ensures complete lubrication of the splines.
3. Wipe any excess grease from the pressure-relief
hole, slip-joint seal, and grease fitting.
41/4
Acterra Maintenance Manual, March 2000
Brakes
42
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Air Brake Valve Disassembly, Cleaning, and Inspecting, Bendix E–8P, R–12,
R–14, SR–1, ST–3, TC–6, and TP–3DC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–16
Air Brake Valve Inspecting and Leak Checking, Bendix BP–R1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–02
Air Brake Valve Leak Checking, Bendix TC–6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–14
Air Brake Valve Operation Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–04
Air Dryer Checking, Bendix AD–9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–12
Air Dryer Desiccant Replacing, Bendix AD–9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–13
Air Dryer Inspecting, Bendix AD–9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–01
Air Reservoir Automatic Drain Valve Disassembly, Cleaning, Inspecting, and
Lubricating, Bendix DV–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–15
Automatic Slack Adjuster Checking, Meritor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–09
Automatic Slack Adjuster Inspecting, Gunite . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–21
Automatic Slack Adjuster Inspecting, Meritor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–11
Automatic Slack Adjuster Lubricating, Gunite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–20
Automatic Slack Adjuster Lubricating, Haldex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–22
Automatic Slack Adjuster Lubricating, Meritor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–10
Bosch Rail-Slide Hydraulic Brake Caliper Lubricating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–23
Brake Chamber Inspecting (All Models). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–07
Brake Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–24
Brake Lines Checking, Hydraulic Disc Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–18
Brake Lining Wear Checking, Hydraulic Disc Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–17
Camshaft Bracket Bushing Lubricating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–08
Foot Brake Valve Actuator Lubricating, Bendix E–8P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–03
Power Booster Checking, Bendix Hydro-Max® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–19
Quick Release and Flipper Valves Checking, Midland . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–06
Relay Valve Checking, Midland. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42–05
Acterra Maintenance Manual, October 2007
42
Brakes
42–01 Air Dryer Inspecting,
Bendix AD–9
1. Check the reservoirs for moisture. A small
amount (teaspoon or less) is normal. Larger
amounts may mean that the desiccant needs to
be replaced. Check the mounting and connecting
lines.
2. Tighten the fasteners that attach the air dryer to
the vehicle. Use the following torque values:
• 28 lbf·ft (38 N·m) for SAE grade 5, 3/8–16
fasteners
42–03 Foot Brake Valve
Actuator Lubricating,
Bendix E–8P
1. Clean any dirt, gravel, and other foreign debris
from the plunger boot and brake base bracket.
2. Check the brake plunger boot for cracks, holes,
or deterioration. Replace if necessary.
3. Lift up the edge of the brake plunger boot and
check the plunger for existing lubrication.
3.1
If the plunger is dry, remove it by removing the cotter pin from the clevis pin and
pulling the clevis pin out. Remove the piston rod and boot. Lift out the plunger. Lubricate the plunger and the tip of the piston rod with barium grease part number
BW 246671, or Penzoil Adhezoplex EP 2.
Install the piston rod, boot, clevis pin, and
cotter pin.
3.2
If the plunger has grease on it, lift the
edge of the brake plunger boot enough to
apply 2 to 4 drops of light oil around the
brake plunger. Do not over-oil. Install the
plunger boot.
• 135 lbf·ft (183 N·m) for SAE grade 5,
5/8–11 fasteners
3. Check all air lines, fittings, and electrical connections for damage, leakage, or looseness.
4. Replace damaged or leaking parts, and tighten
loose fittings or electrical connections.
42–02 Air Brake Valve
Inspecting and Leak
Checking, Bendix BP–R1
1. Clean the valve exterior and inspect it for corrosion and damage.
2. Inspect the air lines connected to the valve for
signs of wear or damage. Replace the lines as
needed.
3. Check the valve for leakage.
3.1
Apply the service brakes and hold them
on full line pressure of at least 80 psi
(550 kPa).
3.2
Check the air line fittings for leaks; tighten
or replace the fittings as needed.
3.3
Coat the exhaust port and body of the
valve with soapy water, and check for
leakage. Leakage is excessive if it produces a 1-inch (25-mm) bubble within 5
seconds.
If the brake valve does not function as
described above, or if leakage is excessive, replace it with a new or remanufactured unit. Repeat the leakage checks
before placing the brake valve in service.
Acterra Maintenance Manual, October 2007
4. Lubricate the clevis pin with light oil.
5. Check for leakage. For instructions, see Group
42 of the Acterra® Workshop Manual.
42–04 Air Brake Valve
Operation Checking
Check for proper operation of the brake air valves.
For instructions, see Group 42 of the Acterra® Workshop Manual.
42–05 Relay Valve Checking,
Midland
1. Park the vehicle on a level surface. Chock the
tires.
2. Start the engine and run it long enough to pressurize the air system to at least 80 psi (550 kPa).
Turn off the engine. Repeat as necessary to
maintain 80 psi (550 kPa) pressure during this
check.
42/1
42
Brakes
3. Clean any road grime from the relay valve and
any debris from the valve exhaust port.
brake chamber section in Group 42 of the
Acterra® Workshop Manual.
4. Listen for air leakage around the fittings or exhaust port. Tighten the fittings as necessary. Use
two wrenches to avoid twisting the tubing.
1
5. If the valve fails this check or is damaged, repair
or replace it. For instructions, see the Midland
service manual.
A
6. Remove the chocks from the tires.
42–06 Quick Release and
Flipper Valves Checking,
Midland
1. Park the vehicle on a level surface. Chock the
tires.
2. Start the engine and run it long enough to pressurize the air system to at least 80 psi (550 kPa).
Turn off the engine. Repeat as necessary to
maintain 80 psi (550 kPa) pressure during these
checks.
3. Clean any road grime from the valves and any
material from the valves’ exhaust ports.
4. Listen for air leakage around the fittings and exhaust ports. Tighten the fittings as necessary.
Use two wrenches to avoid twisting the tubing.
5. If any valve fails this check or is damaged, repair
or replace it. For instructions, see the Midland
service manual.
6. Remove the chocks from the tires.
42–07 Brake Chamber
Inspecting (All Models)
WARNING
Do not loosen or remove the parking brake clamp
ring for any purpose at any time. See Fig. 1. The
parking/emergency brake section is not intended
to be serviced. Serious injury or death may result
from sudden release of the power spring.
Before doing any repairs or adjustments on a
service/parking brake chamber, read the applicable warnings and instructions in the applicable
42/2
f421352
02/22/2000
A. Do not remove the factory-sealed clamp ring.
1. Model TR-T (TR Series) Brake Chamber
Fig. 1, MGM Brake Chamber
WARNING
Do not operate the vehicle with the front brakes
backed off or disconnected. Backing off or disconnecting the front brakes will not improve vehicle
handling and may lead to loss of vehicle control
resulting in property damage or personal injury.
NOTE: Vehicles operating under severe or adverse conditions should be checked more frequently. If the brake chamber requires disassembly, see Group 42 of the Acterra®
Workshop Manual for instructions.
1. With the slack adjuster properly adjusted, check
the angle formed by the centerline of the piston
rod and slack adjuster. This angle should be
greater than 90 degrees in the released position
and approach 90 degrees in the applied position.
See Fig. 2.
At angles less than 90 degrees, brake chamber
force is reduced, which reduces braking
efficiency.
Acterra Maintenance Manual, October 2007
42
Brakes
A
1
B
2
2
3
C
B
1
A
3
07/27/94
A.
B.
1.
2.
Brakes Released
Brakes Applied
Brake Chamber
Piston Rod
C. Greater than 90
degree angle
3. Slack Adjuster
Fig. 2, Angle Between Piston Rod and Slack Adjuster
2. Check each brake chamber for correct installation.
2.1
2.2
4
f420009a
Check each mounting stud for the presence of prevailing torque locknuts and
hardened flatwashers. Make sure that the
hardened flatwashers are installed between the mounting bracket and the locknuts. Do not install flatwashers touching
the service (non-pressure) chamber.
If the locknuts are loose, tighten them.
For correct torque values, see the applicable brake chamber section in Group 42
of the Acterra® Workshop Manual.
3. Observe the piston rod engagement with the clevis. Engagement of at least 7 threads is required;
there should be 1-inch (25-mm) clearance from
the centerline of the clevis pin hole to the end of
the piston rod. See Fig. 3. Adjust if needed.
4. Check the tightness of the piston rod nut. See
Table 1 for torque values. Tighten if needed.
5. See if the chamber piston rod is in line with the
slack adjuster. Misalignment can cause the piston rod to rub on the non-pressure chamber and
cause a dragging brake. Reposition the brake
chamber on the mounting bracket, if necessary.
5
08/20/93
f420225a
A. Minimum of 1-inch (25-mm) clearance between
centerline of clevis pin hole and piston rod end.
B. Minimum of 7 threads engagement.
1. Piston Rod
4. Cotter Pin
2. Piston Rod Nut
5. Clevis Pin
3. Clevis
Fig. 3, Piston Rod Engagement With the Clevis
Piston Rod Nut Torque Values
Rod Size:
inch
Description
MGM Tandem Chambers
Midland Service Chambers
Torque:
lbf·ft (N·m)
All
25–35 (34–47)
1/2
20–30 (27–41)
5/8
33–90 (45–122)
Table 1, Piston Rod Nut Torque Values
6. Inspect the condition of the hose(s) to the brake
chamber. Check carefully for chafing, restrictions
such as kinking or bending, and make sure the
hoses are properly supported. Replace a damaged hose with the same size hose. With the
service brakes applied, check for leaks at the
hose-to-chamber connections. Any leaks are
probably caused by loose connections or by a
damaged hose fitting. Eliminate all leaks.
WARNING
Read and follow all applicable warnings and instructions in Group 42 of the Acterra® Workshop
Manual for repairs to the service/parking brake
chambers. These chambers contain a power
Acterra Maintenance Manual, October 2007
42/3
42
Brakes
spring which, if released, could cause serious injury or death.
1. Apply the service brakes and check that the piston rods move out promptly without binding.
7. Inspect the exterior surfaces of the chamber for
damage. Make sure the breather holes in the
non-pressure section(s) are open and free of debris. Using the instructions in Group 42 of the
Acterra® Workshop Manual, replace any damaged parts.
2. Release the service brakes and check that the
piston rods return to the released positions
promptly without binding.
8. On parking brake chambers equipped with integral release bolts, lubricate the bolt with thread
anti-seize compound. Check the tightness of the
bolt. For torque values, see the applicable brake
chamber section in Group 42 of the Acterra®
Workshop Manual.
Read and follow all applicable warnings and instructions in Group 42 of the Acterra® Workshop
Manual for repairs to the service/parking brake
chambers. These chambers contain a power
spring, which if released, could cause serious injury or death.
WARNING
3. Check the service brake chambers for leakage.
CAUTION
If the external breather tube is missing or incorrectly installed, road dirt and debris can adversely
affect the operation of the brake chamber. Once
inside the chamber, dirt and debris cause the internal parts to deteriorate and shorten their lives.
9. On brake chambers equipped with an external
breather tube, make sure the flexible elbows are
in place and the connector tube is inserted into
each elbow 1/2 inch (13 mm).
10. On all parking brake installations, check for presence of an end cover cap or dust plug and make
sure the cap or plug is securely snapped into
place.
Service Brake Operation and
Leakage Checking
WARNING
Do not loosen or remove the parking brake clamp
ring for any purpose at any time. See Fig. 1. The
parking/emergency brake section is not intended
to be serviced. Serious injury or death may result
from sudden release of the power spring.
WARNING
Before doing any repairs or adjustments on a
service/parking brake chamber, read the applicable warnings and instructions in the applicable
brake chamber section in Group 42 of the
Acterra® Workshop Manual.
42/4
3.1
Apply the service brakes and hold them
on full line pressure of at least 80 psi
(550 kPa).
CAUTION
Do not overtighten the clamp ring. This can distort
the flange sealing surface, or the clamp ring itself.
3.2
Using soapy water, coat the service
chamber clamp ring. Leakage is excessive if it produces a 1-inch (25-mm)
bubble within 5 seconds. See Fig. 1. On
Bendix service chambers, tighten the
clamp ring enough to stop the leakage,
but do not exceed the maximum torque
limits in Table 2. Do not overtighten.
On other service chamber makes, if leakage is detected, tighten the clamp ring;
but do not exceed the maximum torque
limits in Group 42 of the Acterra® Workshop Manual.
Clamp Ring Torque Values (Bendix Chambers)
Description
Torque:
lbf·in (N·cm)
5/16–24 Nut
130–150 (1460–1700)
3/8–16 Nut
140–180 (1580–2040)
Table 2, Clamp Ring Torque Values (Bendix
Chambers)
Acterra Maintenance Manual, October 2007
42
Brakes
3.3
3.4
If leakage persists, use the instructions in
Group 42 of the Acterra® Workshop
Manual to replace the service brake diaphragm.
Using soapy water, coat the area around
the piston-rod bore. On some Bendix service chambers loosen the boot, if necessary. No leakage is permitted. If there is
leakage, use the instructions in the applicable brake chamber section in Group 42
of the Acterra® Workshop Manual and
replace the service brake diaphragm.
WARNING
Do not disconnect the pressurized parking brake
hose. If disconnected under pressure, the parking
brake hose will whip as air escapes from the line,
and the air stream can direct dirt or sludge toward
persons in the area, which could result in injury.
4. Check the parking brake chambers for leakage.
4.1
NOTE: On weatherproof Bendix chambers, the
leakage check can be performed at the crossdrilled mounting stud.
Parking Brake Operation and
Leakage Checking
WARNING
Do not loosen or remove the parking brake clamp
ring for any purpose at any time. See Fig. 1. The
parking/emergency brake section is not intended
to be serviced. Serious injury or death may result
from sudden release of the power spring.
Before doing any repairs or adjustments on a
service/parking brake chamber, read the applicable warnings and instructions in the applicable
brake chamber section in Group 42 of the
Acterra® Workshop Manual.
1. Park the vehicle on a level surface. Chock the
tires.
2. Build the air pressure in the system to at least
100 psi (690 kPa), and shut off the engine.
3. Place the park control valve in the park position.
The brake should apply immediately. Place the
park control valve in the released position. The
brake should release immediately.
If the brakes do not apply or release as required,
see the air brake system troubleshooting guide in
the applicable brake chamber section in Group
42 of the Acterra® Workshop Manual for possible
causes and corrections.
Acterra Maintenance Manual, October 2007
With the park control valve released,
apply soapy water around the parking
brake diaphragm clamp ring and at the
drain slots and exhaust breather on the
body. Disconnect the service brake hose
at the service port, and apply soapy water
to check for piston O-ring leakage.
WARNING
Read and follow all applicable warnings and instructions in the applicable brake chamber section
in Group 42 of the Acterra® Workshop Manual for
repairs to the service/parking brake chambers.
These chambers contain a power spring, which if
released, could cause serious injury or death.
4.2
If leakage is detected at either the clamp
ring or the drain slots, replace the parking
brake section. Slight leakage is permitted
at the service port. Any other leakage is
not acceptable. Using the instructions in
the applicable brake chamber section in
Group 42 of the Acterra® Workshop
Manual, replace the parking brake section
(do not attempt to service the parking
brake section).
5. Connect the air hose to the brake chamber, making sure that the fittings are clean and free of
debris. Tighten the nut finger-tight. Using a
wrench, further tighten the nut until you feel resistance. Then, tighten the nut one-sixth turn
more.
6. Repeat the above steps for each parking brake
chamber.
7. Apply the parking brakes. Remove the chocks
from the tires.
42/5
42
Brakes
42–08 Camshaft Bracket
Bushing Lubricating
system and inspect it for worn or damaged components. Improperly maintaining the vehicle braking system may lead to brake failure, resulting in
property damage, personal injury, or death.
IMPORTANT: Perform MOP 42–24 before lubricating the camshaft brackets.
Pump multipurpose chassis grease (NLGI Grade 1 or
2) into the chamber bracket until it appears at the
slack adjuster end of the bracket. See Fig. 4. Use
care that no grease enters the drum cavity. If grease
leaks out under the camhead, the camshaft grease
seal is worn or damaged, or is installed backwards.
1. Inspect the slack adjuster for structural damage.
Replace the slack adjuster if needed.
2. Check the boot for cuts, tears, etc., and replace
it if necessary. See Fig. 5.
1
2
NOTE: The use of meter-type fittings, having a
maximum 40 psi (275 kPa) pressure relief at
shutoff, is recommended.
3
4
1
5
7
3
6
10/20/93
2
05/28/93
A.
1.
2.
3.
A
f420011a
Grease exit.
Brake Chamber
Slack Adjuster
Grease Fitting
f420012a
Brake Chamber
Clevis
Actuator Rod
Boot
Pull-Pawl
Manual Adjusting Nut
Grease Fitting (or Lube Plug)
Fig. 5, Meritor Automatic Slack Adjuster
Fig. 4, Camshaft Bracket Bushing Lubrication
42–09 Automatic Slack
Adjuster Checking,
Meritor
WARNING
Manually adjusting an automatic slack adjuster to
bring the pushrod stroke within legal limits is
likely masking a mechanical problem. Adjustment
is not repairing. Before adjusting an automatic
slack adjuster, troubleshoot the foundation brake
42/6
1.
2.
3.
4.
5.
6.
7.
42–10 Automatic Slack
Adjuster Lubricating,
Meritor
IMPORTANT: Perform MOP 42–24 before lubricating the slack adjusters.
Lubricate the slack adjuster using high-temperature,
waterproof grease NLGI Grade 1, Texaco Thermotex
EP 1, Shell Darina No. 1, Marathon 528 heavy-duty,
Sunaplex No. 1 EP, Amdex No. 1 EP, or Philube B
No. 1. It should be smooth-textured, corrosionresistant grease, free of fillers and abrasives.
Acterra Maintenance Manual, October 2007
Brakes
42–11 Automatic Slack
Adjuster Inspecting,
Meritor
IMPORTANT: Perform MOP 42–24 before lubricating the slack adjusters.
1. Remove the pull-pawl assembly. See .
2. Examine the pull-pawl assembly for grease retention and condition. If the grease is in good
condition, install the pull-pawl assembly. Lube
the slack adjuster through the grease fitting until
lubricant is forced out through the inboard camshaft splines and the pull-pawl assembly.
If the grease is hardened, or the pull-pawl assembly is dry and shows extreme wear, remove
the slack adjuster. Disassemble and clean the
slack adjuster. Inspect the internal parts. Install
new seals and a new boot when assembling.
Install and lubricate the slack adjuster. See
Group 42 of the Acterra® Workshop Manual.
42–12 Air Dryer Checking,
Bendix AD–9
During cold-weather operation, check the operation
of the end cover heater and thermostat assembly.
1. With the ignition on, check for voltage to the
heater and thermostat assembly. Unplug the
electrical connector at the air dryer, and place
the test leads of a voltmeter on each of the pins
of the male connector. If there is no voltage, look
for a blown fuse, broken wires, or corrosion in
the vehicle wiring harness. Check that a good
ground path exists.
2. Check the thermostat and heater operation. Turn
off the ignition switch and cool the end cover assembly to below 40°F (4°C). Using an ohmmeter,
check the resistance between the electrical pins
in the female connector. The resistance should
be 1.5 to 3.0 ohms for the 12-volt heater assembly.
42
not, replace the purge-valve housing assembly,
which includes the heater and thermostat assembly.
42–13 Air Dryer Desiccant
Replacing, Bendix AD–9
The desiccant change interval may vary from vehicle
to vehicle. Although typical desiccant cartridge life is
three years, many will perform adequately for a
longer period of time. To take maximum advantage of
desiccant life and ensure that replacement occurs
only when necessary, disassemble, clean, and inspect the air dryer. Replace the desiccant cartridge.
For instructions, see Group 42 of the Acterra® Workshop Manual.
42–14 Air Brake Valve Leak
Checking, Bendix TC–6
Check for leakage. For instructions, see Group 42 of
the Acterra® Workshop Manual.
42–15 Air Reservoir Automatic
Drain Valve
Disassembly, Cleaning,
Inspecting, and
Lubricating, Bendix
DV–2
Disassemble the drain valve, clean the parts with
mineral spirits, and inspect the parts. Replace all rubber parts and any worn or damaged parts. Use only
genuine Bendix replacement parts or kits. Assemble
and install the valve. Check for proper operation and
leakage. For instructions, see Group 42 of the
Acterra® Workshop Manual.
Warm the end cover assembly to over 90°F
(32°C) and again check the resistance. It should
exceed 1000 ohms. If it does, the thermostat and
heater assembly is operating properly. If it does
Acterra Maintenance Manual, October 2007
42/7
42
Brakes
42–16 Air Brake Valve
Disassembly, Cleaning,
and Inspecting, Bendix
E–8P, R–12, R–14, SR–1,
ST–3, TC–6, and TP–3DC
Disassemble each brake valve, clean the parts with
mineral spirits, and inspect the parts. Replace all rubber parts and any worn or damaged parts. Use only
genuine Bendix replacement parts or kits. Assemble
and install the valves. Check for proper operation
and leakage. For instructions, see Group 42 of the
Acterra® Workshop Manual.
42–17 Brake Lining Wear
Checking, Hydraulic
Disc Brakes
Before checking lining wear with the wheel removed,
review the following brake lining exposure warnings.
WARNING
Breathing brake lining dust (asbestos or nonasbestos) could cause lung cancer or lung disease. Unless exposure can be reduced below legal
limits, wear an air purifying respirator approved
by MSHA or NIOSH at all times when servicing the
brakes, starting with removal of the wheels and
continuing through assembly.
To minimize the possibility of creating airborne brake
lining dust, clean the dust from the brake rotor, brake
caliper, and brake assembly, using an industrial-type
vacuum cleaner equipped with a high-efficiency filter
system. Then, using a rag soaked in water and
wrung until nearly dry, remove any remaining dust.
Do not use compressed air or dry brushing to clean
the brake assembly.
1. Check lining wear.
1.1
Apply the parking brakes. Chock the tires
to prevent vehicle movement.
1.2
Remove one or more of the lining inspection plugs, and measure brake lining
thickness.
42/8
1.3
On front and rear axles, replace linings
worn to less than 1/16 inch (1.6 mm).
1.4
Make sure that the brake rotor and linings
are free of oil and grease.
1.5
Install the inspection plug(s).
2. If the wheel and hub assembly is removed from
the axle, check lining wear. Replace the linings
on all brake assemblies if worn to less than 1/16
inch (1.6 mm) at the thinnest point.
NOTE: To replace the brake linings, see the applicable foundation brake section in Group 42 of
the Acterra® Workshop Manual.
42–18 Brake Lines Checking,
Hydraulic Disc Brakes
Check all hydraulic lines and fittings for damage,
leakage, or looseness.
Replace damaged or leaking components, and
tighten loose fittings.
42–19 Power Booster
Checking, Bendix
Hydro-Max®
Check for proper operation. For instructions, see
Group 42 of the Acterra® Workshop Manual.
42–20 Automatic Slack
Adjuster Lubricating,
Gunite
IMPORTANT: Perform MOP 42–24 before lubricating the slack adjusters.
Lubricate the slack adjuster until grease flows from
the grease relief opening. See Fig. 6. For temperatures to –40°F (–40°C), use Lubriplate Aero; for temperatures to –20°F (–29°C), use Texaco Multifak
EP-2 or Mobil Grease No. 77.
The newest Gunite slack adjusters are produced
without a grease relief. During lubrication with a
grease gun, lubricant is forced through the drilled
worm wheel onto the camshaft. Lubricate the slack
Acterra Maintenance Manual, October 2007
42
Brakes
adjuster at the grease fitting until grease appears on
the camshaft.
ponents. Improperly maintaining the vehicle braking system may lead to brake failure, resulting in
property damage, personal injury, or death.
1. Inspect the slack adjuster for structural damage.
Replace the slack adjuster if needed.
2. Inspect the slack adjuster boot for cuts or tears.
4
5
6
7
3
If the boot is damaged, replace it as follows. See
.
2.1
Remove the two clevis pins.
2.2
Rotate the worm shaft adjusting hexnut
counterclockwise to move the link away
from the clevis. About 45 lbf·ft (60 N·m) is
needed. You will hear a clicking sound.
8
Remove the old boot from the link.
2
9
1
2.3
Install a new boot on the link, heavy section down. Be careful not to damage the
boot.
2.4
Seat the boot so that the bottom of the
boot is in the boot insert, and the top is in
the groove of the link.
2.5
Rotate the adjusting hexnut clockwise
until the 1/4-inch hole in the clevis lines
up with the hole in the link.
10
Install the 1/4-inch clevis pin and the cotter pin.
f420653a
10/27/93
1. 7/16-Inch Adjusting
Hexnut
2. Grease Fitting
3. Boot
4. Link
5. Brake Chamber Piston
Rod
6.
7.
8.
9.
Clevis
1/2-Inch Clevis Pin
1/4-Inch Clevis Pin
Grease Relief
Opening
10. Slack Adjuster Spline
Fig. 6, Gunite Automatic Slack Adjuster
42–21 Automatic Slack
Adjuster Inspecting,
Gunite
WARNING
Manually adjusting an automatic slack adjuster to
bring the pushrod stroke within legal limits is
likely masking a mechanical problem. Adjustment
is not repairing. Before adjusting an automatic
slack adjuster, troubleshoot the foundation brake
system and inspect it for worn or damaged com-
Acterra Maintenance Manual, October 2007
2.6
Tap the clevis upward or downward until
the large hole in the slack adjuster lines
up with one in the clevis.
Install the 1/2-inch clevis and the cotter
pin.
WARNING
Make sure both clevis pins are installed. Failure to
do so will cause the slack adjuster to work incorrectly, which could lead to loss of braking control.
This could result in an accident causing personal
injury or property damage.
42–22 Automatic Slack
Adjuster Lubricating,
Haldex
IMPORTANT: Perform MOP 42–24 before lubricating the slack adjusters.
42/9
42
Lubricate a Haldex automatic slack adjuster at the
grease fitting with any extreme-pressure NLGI Grade
1 or Grade 2 grease if the operating temperature is
–20°F (–29°C) and above. If the operating temperature is below –20°F (–29°C), use a low-temperature
extreme-pressure grease.
Brakes
3
2
5
1
42–23 Bosch Rail-Slide
Hydraulic Brake Caliper
Lubricating
NOTE: This procedure is only for vehicles
equipped with Bosch rail-slide hydraulic brake
calipers.
IMPORTANT: After the vehicle is put into service, lubricate the calipers every 6 months or
every 18,000 miles (28 800 km), whichever
comes first.
4
6
f420565a
10/28/94
1. Caliper
2. Wear Shim
3. Spring
4. Fastener
5. Key
6. Anchor Plate
Fig. 7, Anchor Plate and Key Fastener
1. Park the vehicle on a level surface. Shut down
the engine, set the parking brake, and chock the
front or the rear tires, depending on which axle
you are working on.
4
3
2
2. Raise the vehicle off of the ground and securely
support it with jack stands.
5
1
3. Remove the wheel from each wheel end. For
instructions, see Group 40 of the Acterra® Workshop Manual.
4. Place a stool near the axle to rest the caliper
upon after the caliper is removed.
5. Remove the key-retaining fastener from the anchor plate. See Fig. 7.
6. Using a hammer and drift, carefully drive out the
key and spring. See Fig. 8. Be careful not to nick
the anchor plate rail.
7. Insert a large flat-bladed screwdriver through the
caliper vent window and into the rotor fins. Pry
the caliper outward; this will push the pistons
back slightly into the caliper, making removal
easier.
8. Grasp the caliper, swing it out and lift it from the
anchor plate. Rest the caliper on the stool. For
ease of removal, swing the caliper on the forward anchor plate torque rail (the large one opposite the key and spring rail).
42/10
6
f420546
08/11/93
1. Key
2. Spring
3. Anchor Plate Upper
Rail
4. Rotor
5. Outboard Brake Pad
6. Caliper Housing
Fig. 8, Drive Out the Key and Spring
9. Carefully remove the brake pads to avoid damaging or getting grease on the pad faces. Set
them aside.
10. Using brake cleaner or alcohol, remove old
grease from the caliper V-ways, the anchor plate
rails, and the shoe slots. See Fig. 7 and Fig. 9.
Also clean the key and spring.
11. Using a wire brush or wire wheel, remove any
remaining debris from the V-ways, rails, shoe
slots, key and spring.
Acterra Maintenance Manual, October 2007
42
Brakes
42–24 Brake Inspection
IMPORTANT: This procedure should be performed prior to lubrication of the brake components.
2
Parking Brake Operational Check
CAUTION
1
f420595a
10/28/94
1. V-Ways
2. Bleeder Fitting
Fig. 9, Caliper V-Ways
12. Apply two level teaspoons of Aeroshell Grade 5
(ES1246) grease on each side of the assembly.
Apply it evenly along the full length of the V-way
groove and anchor plate rail, and apply one level
teaspoon evenly on both sides of the key and
spring. After the caliper is installed, pack any accumulation of grease at each end of the rail and
along the top of the rail or key at the V-way.
Perform the following check in a clear safe area. If
the parking brakes fail to hold the vehicle, personal injury or property damage may result.
1. With the engine running, and air pressure at cutout pressure, set the parking brake.
2. Put the vehicle in the lowest gear and gently attempt to move it forward. The vehicle should not
move. If the vehicle moves, the parking brakes
are not operating correctly and must be repaired
before the vehicle is returned to service. See
Group 42 of the Acterra® Workshop Manual for
repair procedures.
13. Being careful not to get grease or dirt on the pad
face, install each brake pad.
Brake Component Inspection
14. Grasp the caliper firmly, rest the V-ways on the
forward anchor plate torque rail (the large rail)
and swing the caliper into place. Make sure that
the brake hose is not twisted. Do not get grease
on the pad faces or rotor surfaces.
1. Park the vehicle on a level surface, set the parking brake, and chock the tires. Once the tires are
chocked, release the parking brake.
15. With the caliper installed and firmly seated on
the forward rail (large rail), position the key and
spring between the caliper V-way and the anchor
rail from the inboard end of the anchor rail.
16. Carefully drive the key and spring into place. Install the key-retaining fastener and torque 12 to
18 lbf·ft (16 to 24 N·m).
17. Install the wheels. For instructions, see Group
40 of the Acterra® Workshop Manual.
18. Before moving the vehicle, press the brake pedal
several times to bring the pistons back to the
normal position.
19. Raise the vehicle, remove the jack stands, and
lower the vehicle to the ground.
20. Remove the chocks from the tires.
21. Test drive the vehicle and ensure that the brakes
operate properly.
Acterra Maintenance Manual, October 2007
WARNING
Manually adjusting an automatic slack adjuster to
bring the pushrod stroke within legal limits is
likely masking a mechanical problem. Adjustment
is not repairing. Before adjusting an automatic
slack adjuster, troubleshoot the foundation brake
system and inspect it for worn or damaged components. Improperly maintaining the vehicle braking system may lead to brake failure, resulting in
property damage, personal injury, or death.
2. With the engine off, and 100 psi (689 kPa) of air
tank pressure, have an assistant apply and hold
an 80 to 90 psi (550 to 620 kPa) brake application.
3. Check to see if the colored over-stroke band on
each brake chamber pushrod is exposed.
If a band shows, the stroke is too long. Check
the foundation brake components for wear or
damage, and repair as needed. See Group 42 of
42/11
42
Brakes
the Acterra® Workshop Manual for inspection,
troubleshooting, and repair procedures.
5. Start the engine and build air pressure to at least
100 psi (689 kPa). Shut down the engine.
4. Measure the applied chamber stroke. See
Table 3 for the proper stroke for the type of
chamber being used. If the stroke is too short,
the brakes may drag or will not fully apply. Check
for improper operation or adjustment of the automatic slack adjuster. See Group 42 of the
Acterra® Workshop Manual for inspection and
troubleshooting procedures.
6. Check all of the foundation brake components for
damage, wear, and loose or missing parts. Repair as needed. See Group 42 of the Acterra®
Workshop Manual for repair procedures.
Brake Chamber Stroke Specifications
Chamber
Type*
Manufacturer
Size†
9
12
Max Applied Stroke: inch (mm)
1-3/8 (35)
16
Standard Stroke
20
1-3/4 (44)
24
Gunite
30
2 (51)
36‡
2-1/4 (57)
16
20
Long Stroke
2 (51)
24 (2-1/2 inch rated
stroke)
24 (3 inch rated
stroke)
2-1/2 (64)
30
12
Standard Stroke
Haldex
42/12
1-3/8 (35)
16
20
1-3/4 (44)
24
2-1/2-Inch Extended Stroke
24
2 (51)
3-Inch Extended Stroke
24
2-1/2 (64)
Standard Stroke
30
2 (51)
Long Stroke
30
2-1/2 (64)
Acterra Maintenance Manual, October 2007
42
Brakes
Brake Chamber Stroke Specifications
Chamber
Type*
Manufacturer
Size†
9
12
Standard Stroke
16
20
Meritor
24
Long Stroke
24
Standard Stroke
30
Max Applied Stroke: inch (mm)
Less than 1-1/2 (38)
Less than 1-3/4 (44)
Less than 1-7/8 (48)
Less than 2 (51)
* Long stroke design is indicated by a tag, or embossing, on the brake chamber.
† Specifications are relative to a brake application with 80 to 90 psi (550 to 620 kPa) air pressure in the brake chambers.
‡ If type 36 chamber is used, slack length should be less than 6 inches.
Table 3, Brake Chamber Stroke Specifications
Acterra Maintenance Manual, October 2007
42/13
Steering
46
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Drag Link Lubricating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46–02
Power Steering Gear Lubricating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46–05
Power Steering Reservoir Fluid Level Checking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46–03
Power Steering Reservoir Fluid and Filter Changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46–04
Steering Driveline Lubricating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46–01
Acterra Maintenance Manual, July 2004
46
Steering
46–01 Steering Driveline
Lubricating
2. Using a pressure gun, apply multipurpose chassis grease at the grease fittings until old grease
is forced out of the socket.
Wipe the grease fittings clean. See Fig. 1. Using a
pressure gun, apply a lithium-based grease (NLGI
grade 2) sparingly to the universal joints and slip-joint
splines.
NOTE: Use multipurpose chassis grease NLGI
grade 1 (6% 12-hydroxy lithium stearate grease)
or NLGI grade 2 (8% 12-hydroxy lithium stearate grease). Grade 2 chassis grease is preferred.
46–02 Drag Link Lubricating
1. Using a clean rag, wipe the dirt from both grease
fittings on the drag link. See Fig. 2.
6
1
5
4
3
7
2
1
7
6
f460516a
10/05/94
1. Pinch Bolt
2. Universal Joint Shaft
3. Bushing
4. Boot
5. Boot Retainer
6. Prevailing Torque Locknut
7. Grease Fitting
Fig. 1, Steering Driveline
Acterra Maintenance Manual, July 2004
46/1
46
Steering
6. Close the hood, and remove the chocks from the
tires.
Nelson Reservoir
NOTE: If the power steering reservoir in the vehicle looks like the reservoir shown in Fig. 3,
use the following procedure.
1. Turn off the engine, apply the parking brakes,
and chock the tires.
2
1
1
6
10/05/94
3
f460926
4
1. Grease Fitting
2. Drag Link (pitman arm end shown)
5
Fig. 2, Steering Drag Link
46–03 Power Steering
Reservoir Fluid Level
Checking
Metal Ventra Reservoir
1. Turn off the engine, apply the parking brakes,
and chock the tires.
2. Open the hood.
3. Clean around the power steering reservoir fill cap
with a clean rag, then remove the dipstick.
WARNING
2
07/09/98
1. Fill Cap
2. Filter Spring
3. Filter Top Plate
f461670
4. Clamp
5. Filter
6. Reservoir Cover
Fig. 3, Nelson Power Steering Reservoir and Filter
2. Open the hood.
3. With the engine cool, the level should be between MIN COLD and MAX HOT lines with the
engine off. Add or remove fluid as necessary to
bring the fluid level to the line between the MIN
COLD and MAX HOT lines. Use only Dexron® III
automatic transmission fluid.
Fill only with approved clean fluid. Do not mix
fluid types. Any mixture or any unapproved fluid
could lead to seal deterioration and leaks. Fluid
leakage could cause loss of power steering assist,
possibly resulting in personal injury and property
damage.
4. With the engine hot, the fluid level should be at
the MAX HOT line with the engine off.
4. With the power steering fluid at operating temperature, check the fluid level on the dipstick. If
below the ADD mark, add enough fluid to bring
the level up to the FULL mark on the dipstick.
Use Dexron® III automatic transmission fluid
(ATF) in the power steering reservoir.
6. Close the hood, and remove the chocks from the
tires.
5. Add or remove fluid as necessary to bring the
fluid level to the MAX HOT line. Use only
Dexron® III automatic transmission fluid.
5. Install the fill cap on the power steering reservoir.
46/2
Acterra Maintenance Manual, July 2004
46
Steering
Plastic Ventra Reservoir
NOTE: If the power steering reservoir in the vehicle looks like the reservoir shown in Fig. 4,
use the following procedure.
1. Turn off the engine, apply the parking brakes,
and chock the tires.
2
46–04 Power Steering
Reservoir Fluid and
Filter Changing
Metal Ventra Reservoir
1. Turn off the engine, apply the parking brakes,
and chock the tires.
3
4
2. Open the hood.
3. Remove the fill cap, nut, and cover from the
steering reservoir.
4. Disconnect the hose, between the reservoir and
the steering gear, from the reservoir. Then drain
the reservoir in a drain pan, and cap the reservoir port.
1
5. Lift out the spring and filter element.
6. Thoroughly clean the reservoir with a lint-free
cloth.
7. Install a new filter element, and position the
spring on top of the filter element.
10/19/2001
1.
2.
3.
4.
f461917
Power Steering Reservoir
Retaining Ring
Filter Cover
Return Hose
Fig. 4, Power Steering Reservoir
2. Open the hood.
3. With the engine cool, the fluid level should be
between the MIN COLD and MAX HOT lines with
the engine off. Add or remove fluid as necessary
to bring the fluid level to the line between the
MIN COLD and MAX HOT lines. Use only
Dexron® III automatic transmission fluid.
4. With the engine hot, the fluid level should be at
the MAX HOT line with the engine off. Add or
remove fluid as necessary to bring the fluid level
to the MAX HOT line. Use only Dexron® III automatic transmission fluid.
5. Close the hood, and remove the chocks from the
tires.
8. Fill the reservoir with Dexron® III automatic transmission fluid.
WARNING
Fill only with approved clean fluid. Do not mix
fluid types. Any mixture or any unapproved fluid
could lead to seal deterioration and leaks. Fluid
leakage could cause loss of power steering assist,
possibly resulting in personal injury and property
damage.
9. Place the end of the hose in the drain pan. Do
not start the engine while draining the system. Raise the front of the vehicle with a floor
jack and support it with jack stands. Have someone turn the steering wheel to full lock left and
right, and capture the fluid flowing from the hose
in the drain pan. Add fluid to the reservoir, as
needed. Continue turning the steering wheel until
clean power steering fluid flows from the hose.
10. Remove the plug from the reservoir and connect
the hose to the reservoir. Tighten the hose fitting
nut finger tight. Then with a wrench, tighten until
there is firm resistance. Tighten one-sixth turn
more. Do not overtighten.
Remove the jack stands and lower the vehicle.
Acterra Maintenance Manual, July 2004
46/3
46
Steering
11. Fill the reservoir with ATF as needed. Start the
engine and let it idle. Have someone turn the
steering wheel from lock to lock until no bubbles
are seen in the reservoir. Turn off the engine.
12. Install a new cover gasket, the cover, and nut.
Tighten the nut 28 lbf·ft (38 N·m). Install the fill
cap.
13. Start the engine and check the power steering
reservoir fluid level. If the fluid level is low, add
ATF to bring the level up to the FULL mark on
the dipstick.
14. Close the hood and remove the chocks from the
tires.
Nelson Reservoir
WARNING
Fill only with approved clean fluid. Failure to use
the proper fluid could cause seal deterioration and
leaks. Fluid leaks could eventually cause loss of
power steering assist. This could lead to an accident resulting in personal injury or property damage. Wear eye protection when changing the fluid
and filter.
NOTE: If the power steering reservoir in the vehicle looks like the reservoir shown in Fig. 3,
use the following procedure.
1. Turn off the engine, apply the parking brakes,
and chock the tires.
2. Open the hood.
3. Place a drain pan under the reservoir, and remove the steering gear-to-reservoir return hose
at the reservoir. Drain the steering fluid into the
drain pan and dispose of the fluid properly. Plug
the return line fitting on the reservoir.
4. Loosen the clamp and remove the cover along
with the filter spring and the filter top plate. See
Fig. 3.
NOTE: Always replace the reservoir filter when
changing the fluid.
5. Remove the filter. It may be necessary to wiggle
the filter to remove it from its base. Do not use
pliers to aid in removal of the filter; pliers could
cause metal chips to enter the steering system.
Clean the inside of the reservoir using a lint-free
cloth.
46/4
IMPORTANT: Do not start the engine while
draining the system.
6. Place the disconnected end of the steering gearto-reservoir hose in a drain pan. Raise the front
of the vehicle with a floor jack and support it with
jack stands. Have someone turn the steering
wheel to full lock left and right. Capture the fluid
flowing from the hose in a drain pan. Add fluid to
the reservoir as needed. When clean fluid flows
from the hose into the drain pan, remove the
plug from the reservoir and reconnect the steering gear-to-reservoir hose to the reservoir. Remove the jack stands and lower the vehicle.
7. With the larger opening at the top, install a new
filter in the reservoir.
8. Clean the reservoir cover and gasket. Inspect the
O-ring and the cover for cracks, deformities, or
damage. Replace the gasket seal or cover as
needed.
9. Install the reservoir cover along with the spring
and the top plate. Make sure the center of the
top plate fits into the opening at the top of the
filter.
10. Place the clamp over the flanges of the cover
and shell assembly, then tighten the clamp 25 to
30 lbf·ft (35 to 40 N·m).
11. Fill the reservoir with Dexron® III automatic transmission fluid to the FULL COLD mark.
12. Start the engine and operate it at idle. Turn the
steering wheel to full lock left and right to adjust
the fluid level and remove any existing air from
the power steering pump and gear. Check the
fluid level again. Add fluid as needed. The system is properly bled when the steering pump
does not labor when turning the wheel.
13. Check for leaks in the system and repair as
needed. Fill the reservoir as needed.
14. Turn off the engine, close the hood, and remove
the chocks from the tires.
Plastic Ventra Reservoir
NOTE: If the power steering reservoir in the vehicle looks like the reservoir shown in Fig. 4,
use the following procedure.
1. Turn off the engine, apply the parking brakes,
and chock the tires.
Acterra Maintenance Manual, July 2004
46
Steering
2. Open the hood.
3. Place a drain pan under the power steering reservoir.
2. Using a hand-type grease gun, apply multipurpose chassis grease until the grease starts coming out of the sector shaft dirt and water seal.
4. Remove the retaining ring from the reservoir.
See Fig. 4.
5. Remove the filter and filter cover from the reservoir. Drain the fluid from the filter into the drain
pan. Leave the filter hanging over the drain pan.
6. Remove the bolts, nuts, and washers that attach
the reservoir to the mounting bracket. Drain the
fluid from the reservoir, but do not remove the
supply line to the reservoir.
1
7. Using bolts, nuts, and washers, attach the reservoir to the mounting bracket.
8. Fill the reservoir with Dexron® III automatic transmission fluid to the line between the MIN COLD
and MAX HOT lines. See Fig. 4.
9. Raise the front of the vehicle and support it with
jack stands.
10. Start the engine and operate it at idle. Turn the
steering wheel from full left to full right several
times until clean fluid starts flowing from the
steering filter. Add fluid to the reservoir to maintain the fluid level between the MIN COLD and
MAX HOT lines.
f460515a
04/13/93
1. Sector Shaft Grease Fitting
Fig. 5, Sector Shaft, TRW TAS Series
11. Shut down the engine and install the filter and
filter cover in the reservoir. Make sure that the
gasket under the filter cover is not damaged. If
the gasket is damaged, replace it. Install the gasket on the reservoir.
12. Attach the retaining ring to the reservoir to secure the filter and filter cover.
13. Start the engine and check that the fluid level is
between the MIN COLD and MAX HOT lines.
Add more fluid if needed.
14. Raise the vehicle, remove the jack stands, and
lower the vehicle.
15. Close the hood, and remove the chocks from the
tires.
46–05 Power Steering Gear
Lubricating
1. Wipe off debris from the grease fitting. See
Fig. 5.
Acterra Maintenance Manual, July 2004
46/5
Fuel
47
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Fuel Tank Draining and Vent Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47–01
Acterra Maintenance Manual, March 2000
Fuel
47
47–01 Fuel Tank Draining and
Vent Checking
Remove the plug or open the drain valve at the bottom of the fuel tank, and allow the tank to drain until
all traces of water and sediment have disappeared;
install the plug or close the drain valve.
On earlier vehicles with a screw-on fuel cap, remove
the fuel cap and clean it with solvent. Make sure the
fuel cap vent is open. Install the cap.
On vehicles with a quarter-turn fuel cap, check to be
sure the vent line at the inboard side of the fuel tank
is clean and not plugged.
Acterra Maintenance Manual, March 2000
47/1
Exhaust
49
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Exhaust System Inspecting (Noise Emission Controls). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49–01
Acterra Maintenance Manual, January 2007
49
Exhaust
49–01 Exhaust System
Inspecting (Noise
Emission Controls)
A
NOTE: In addition to the maintenance interval in
this manual, inspect the exhaust system if the
vehicle has a noticeable increase in noise level
at any time. Replace parts that show leakage,
wear, or damage.
Pre-EPA07 Exhaust System
Inspecting
1. Check the muffler body, muffler outlet stack, muffler shield, and inlet tubes, for leakage, dents,
corrosion, or holes in the muffler.
f490032a
10/05/94
A. Check the Tightness of These Fasteners
Fig. 1, Typical Exhaust-Pipe to Exhaust-Flange
Fasteners
2. Inspect the exhaust pipe for leakage, wear, or
damage; replace with new parts, if needed. Do
not reuse wide-band clamps. Once a clamp is
removed, it must be replaced.
2.1
On Caterpillar and Cummins engines,
check for leakage at the V-type clamp
that attaches the exhaust pipe to the turbocharger exhaust outlet. If leakage exists, tighten the nut on the V-type clamp
85 lbf·in (940 N·cm). If leakage persists,
install a new V-band coupling.
2.2
On Mercedes-Benz MBE900 engines,
check the tightness of the fasteners that
attach the exhaust pipe to the exhaust
flange (see Fig. 1). If needed, tighten the
fasteners 33 lbf·ft (45 N·m) for MercedesBenz MBE900 engines.
3. Check for leakage at each wide-band exhaust
clamp (see Fig. 2). If leakage exists, tighten the
nuts 40 to 60 lbf·ft (54 to 81 N·m). If leakage persists, install a new wide-band exhaust clamp.
See Group 49 of the Acterra® Workshop Manual
for instructions.
EPA07 Exhaust System
Inspecting
IMPORTANT: The Environmental Protection
Agency’s 2007 regulations require lower exhaust emissions, thus requiring new exhaust
system components. See Fig. 3. In particular
Acterra Maintenance Manual, January 2007
f490005a
10/05/94
Fig. 2, Wide-Band Exhaust Clamp
the after-treatment device (ATD), which is part
of the after-treatment system (ATS), requires
special attention during regularly scheduled
maintenance inspections. If any discrepancies
are discovered, refer to the engine manufacturer’s service literature for repair instructions.
Definitions of ATS Components
Refer to the following list of definitions of ATS components.
• After-Treatment System (ATS)—the entire exhaust system from the turbocharger to the exhaust stack or tail pipe.
• After-Treatment Device (ATD)—a muffler-like
canister that houses a DPF, DOC, and sensors.
49/1
49
Exhaust
6
5
1
2
3
4
2
7
5
8
9
3
A
10/20/2006
A.
1.
2.
3.
4.
5.
Inspect this area of the canister for dents.
Marmon Fitting at Inlet from Turbocharger
DOC Temperature Sensor
ATD Mounting Band
DPF Intake Pressure Sensor
DPF V-Band Mounting Clamps
6.
7.
8.
9.
f490283
Sensor Housing
DPF Outlet Temperature Sensor
Exhaust Outlet Marmon Fitting
DPF Outlet Pressure Sensor
Fig. 3, Typical After-Treatment Device
• Diesel Particulate Filter (DPF)—a filter that collects and holds particulate matter (soot and
ash).
3. If present, check the condition of the insulation
material around the exhaust pipe between the
turbocharger and the ATD.
• Diesel Oxidation Catalyst (DOC)—oxidizes hydrocarbons and reduces NOx.
4. Check the ATD mounting bands for tightness.
Tighten to 30 lbf·ft (41 N·m) if needed. Do not
overtighten.
• Sensors—detect temperatures and pressures in
the ATS.
Inspection
1. Check for leakage at the clamp that attaches the
exhaust pipe to the turbocharger exhaust outlet.
If leakage exists, tighten the nut on the clamp to
the required torque. If leakage persists, install a
new clamp.
2. Check the exhaust pipe, bellows, and each exhaust seal clamp for leakage, wear, cracks, or
damage. Replace damaged components as
needed. If leakage exists at a clamp, tighten the
nuts to the required torque. If leakage persists,
install a new exhaust seal clamp. Do not reuse
seal clamps. Once a seal clamp is loosened or
removed, it must be replaced.
49/2
5. Check for leaks around the clamps that attach
the ATD in the ATS, and around the clamps that
retain the DPF in the ATD. No leaks are allowed
anywhere in the system.
6. Check all sensors attached to the ATD for leaks
or damaged wires. No leaks are allowed.
7. Check the DPF exterior surface for dents or
other damage. See Item A of Fig. 3. A dent over
3 inches (76 mm) in diameter and 1/4-inch (6mm) deep could cause internal damage to the
DPF, causing it to malfunction.
8. Check for heat discoloration on the surface of
the ATD. Heat discoloration may indicate internal
damage; especially around the DPF.
Acterra Maintenance Manual, January 2007
Exhaust
49
9. Check any wires, lines, or hoses within 4 inches
(10 cm) of the exhaust system for heat damage.
Repair or reroute as needed.
Acterra Maintenance Manual, January 2007
49/3
Electrical, Instruments, and Controls
54
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Coolant Level Sensor Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54–02
Electrical System Checking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54–01
Acterra Maintenance Manual, March 2000
54
Electrical, Instruments, and Controls
54–01 Electrical System
Checking
still does not work, check the wiring to it. If the
wiring checks out okay, replace the horn.
Cab
1. Uncover the electrical panel (see Fig. 1) by removing the fasteners.
8. Check connectors on the right side of the firewall, below the radiator surge tank. See Fig. 2.
Check the terminals for tightness, damage, and
corrosion or dirt.
1
1
1
2
10/05/94
1. Electrical Connectors
f540843
10/05/94
1. Flasher
Fig. 1, Under-Dash Electrical Panel
f540844
2. Magnetic Switch
Fig. 2, Right Side of the Firewall
9. Check the seven-way trailer cable plug at the
back of the cab. Make sure all the pins are tight
and free of dirt and grease.
2. Check the wiring harness for movement that
could strain the electrical connections. Install
more clamps on the harness, if needed.
Chassis
3. Check all the wiring for chafing, kinks, and discolored insulation. Find the cause of any problems, then repair, replace, or reroute the wires,
as needed.
1. Check the main wiring harness. Check the wiring
insulation for damage from chafing or heat. Also
check for kinks. Reroute, repair, or replace the
wires as needed.
4. Check that all the relays are firmly seated in their
mounting plates.
2. Check all the tie straps for breakage or damage.
Replace any broken or cracked tie straps.
5. Check the turn-signal flasher (if so equipped).
See Fig. 1. Make sure that the two male and
female connectors are firmly connected. Check
that the flasher fuse is firmly seated in its holder.
6. Check the cigarette lighter. Look inside the
socket for signs of overheating (discoloration,
melting) caused by misuse of the lighter socket.
7. Test the electric horn. If it does not work, check
the adjustment screw on the horn unit. Turn the
screw in or out, until the horn works. If the horn
Acterra Maintenance Manual, March 2000
CAUTION
Do not use flat-strip aluminum tie straps for holding electrical wiring. The sharp edges on these tie
straps may cause breaks in the wire insulation,
allowing the aluminum tie strap to make contact
with the wire. This could cause a short circuit and
damage to the wiring.
3. Check the temperature sending units on the
axles and transmission. Check for damaged
wires and loose connectors.
54/1
54
Electrical, Instruments, and Controls
54–02 Coolant Level Sensor
Cleaning
1. Drain enough coolant from the radiator to expose
the coolant level sensor.
2. Disconnect wire 173 from the sensor in the radiator surge tank. Remove the sensor from the
surge tank.
3. Using a fine-grit sandpaper, clean the sensor
until the metal is exposed. Clean the tapped hole
with a wire brush.
4. Install the sensor (do not seal the sensor threads
with tape), and reconnect wire 173. Fill the cooling system to the proper level.
5. Start the engine. The LOW WTR light and warning buzzer should be off. If the light and buzzer
are off, the sensor is okay. If the light and buzzer
are on, replace the sensor.
54/2
Acterra Maintenance Manual, March 2000
Doors
72
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Weatherstrip, Door Latch, and Door Hinge Lubricating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72–01
Acterra Maintenance Manual, March 2000
Doors
72
72–01 Weatherstrip, Door
Latch, and Door Hinge
Lubricating
Lightly coat door weatherstrips with a lubricant that is
safe (as recommended by the lubricant manufacturer) on rubber.
Apply a few drops of light engine oil, or spray a light
coating of silicone lubricant on the door latch mechanism. This will help reduce noise and wear. Wipe off
any excess oil or silicone lubricant.
Lubricate door hinges by spraying them with a light
coating of silicone lubricant.
Always lubricate new cab-door hinges at installation.
Acterra Maintenance Manual, March 2000
72/1
Heater and Air Conditioner
83
Index, Alphabetical
Title of Maintenance Operation (MOP)
MOP Number
Air Conditioner Inspecting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83–01
HVAC Air Filter Replacing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83–02
Acterra Maintenance Manual, March 2003
83
Heater and Air Conditioner
83–01 Air Conditioner
Inspecting
WARNING
Wear eye protection, gloves, and protective clothing when working on the air conditioning system.
Leaking refrigerant from a damaged hose or line
could cause blindness or serious skin burns.
Preliminary Checks
1. Park the vehicle on a level surface, apply the
parking brakes, and chock the tires.
2. Check the appearance of the air conditioner
compressor pulley assembly. If the friction surface of the pulley shows signs of excessive
grooving due to belt slippage, replace both the
pulley and the drive plate. Visually inspect the
refrigerant compressor drive belt for damage,
and check that the belt is set at the proper tension. Also check the tightness of the compressor
mounting fasteners. For instructions and torque
values, see Group 01 of the Acterra® Workshop
Manual.
3. Inspect the drive plate. If the friction surface of
the drive plate shows visible signs of damage
due to excessive heat, replace the drive plate
and pulley assembly. in Group 83 of the
Acterra® Workshop Manual for removal and installation procedures.
4. On a Sanden refrigerant compressor, use a
feeler gauge to check that the drive plate clutch
clearance is 0.016 to 0.03 inch (0.4 to 0.8 mm).
See Fig. 1. If the drive plate clutch requires adjustment, see Group 83 of the Acterra® Workshop Manual.
On a Climate Control refrigerant compressor,
place a feeler gauge between the air conditioner
compressor clutch and the pulley to check the
compressor clutch clearance. Drive plate to pulley clearance is 0.02 to 0.03 inch (0.6 to 0.8
mm). If the clearance is not correct, see Group
83 of the Acterra® Workshop Manual
5. Inspect the compressor clutch coil wire. Check
that the connector is not damaged or loose. Replace the wire if it is damaged.
Acterra Maintenance Manual, March 2003
f830641
08/25/94
Fig. 1, Drive Plate Clearance Inspection
6. Check the overall condition of the air conditioning
hoses. Look for cracks, cuts, and abrasions on
the hoses. Replace damaged hoses. See Group
83 of the Acterra® Workshop Manual for replacement instructions. Also, check for loose fittings
on all air conditioning components.
7. Check for a buildup of road debris on the condenser fins. See Group 83 of the Acterra® Workshop Manual for cleaning instructions.
83–02 HVAC Air Filter
Replacing
The air filter must be replaced every six months, regardless of mileage, to permit proper operation of the
HVAC system.
IMPORTANT: When replacing the air filter, use
only a Sterling-approved air filter.
1. Turn off the engine, apply the parking brakes,
and chock the tires.
2. Open the hood.
3. Remove the screws that attach the filter cover to
the filter housing. See Fig. 2.
4. Remove the filter from the housing.
5. Install a new filter in the housing.
6. Using screws, attach the filter cover to the housing.
7. Close the hood.
8. Remove the chocks from the tires.
83/1
83
1
Heater and Air Conditioner
1
2
f831564
02/17/2003
1. Screw
2. Filter Cover
Fig. 2, Air Filter Replacement
83/2
Acterra Maintenance Manual, March 2003