- Allison Transmissions

Add to my manuals
54 Pages

advertisement

- Allison Transmissions | Manualzz
Mechanic’s Tips
MD 3070PT Series
Transmissions
MT2923EN
MT4108EN
MT2923EN
Mechanic’s
Tips
Allison Transmission
MD 3070PT
February 1995
Rev 1: June 2000
Allison Transmission, Inc.
P.O. Box 894 Indianapolis, Indiana 46206-0894
www.allisontransmission.com
Printed in U.S.A.
Copyright © 2007 Allison Transmission, Inc.
i
IMPORTANT SAFETY NOTICE
IT IS YOUR RESPONSIBILITY to be completely familiar
with the warnings and cautions used in this manual. These
warnings and cautions advise against using specific service
procedures that can result in personal injury, damage to the
equipment, or cause the equipment to become unsafe. These
warnings and cautions are not exhaustive. Allison Transmission
could not possibly know, evaluate, or advise the service trade of
all conceivable procedures by which service might be performed
or of the possible hazardous consequences of each procedure.
Consequently, Allison Transmission has not undertaken any such
broad evaluation. Accordingly, ANYONE WHO USES A
SERVICE PROCEDURE OR TOOL WHICH IS NOT
RECOMMENDED BY ALLISON TRANSMISSION MUST
first be thoroughly satisfied that neither personal safety nor equipment safety will be jeopardized by the service procedures used.
Proper service and repair are important to the safe and reliable
operation of the equipment. The service procedures recommended by Allison Transmission and described in this manual
are effective methods for performing service operations. Some
service procedures require using tools specially designed for the
procedure. Use special tools when and as recommended.
ii
TABLE OF CONTENTS
Paragraph
Description
SECTION I
PREVENTIVE MAINTENANCE
1–1.
1–2.
1–3.
1–4.
1–5.
1–6.
1–7.
1–8.
1–9.
1–10.
1–11.
1–12.
SECTION II
2–1.
2–2.
2–3.
2–4.
2–5.
SECTION III
3–1.
3–2.
3–3.
3–4.
3–5.
3–6.
SECTION IV
4–1.
4–2.
4–3.
Page
Periodic Inspection And Care . . . . . . . . . . . . . . . . . . . . . . .
Importance Of Proper Transmission Fluid Level. . . . . . . . .
Transmission Fluid Check . . . . . . . . . . . . . . . . . . . . . . . . . .
Keeping Fluid Clean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid Recommendations. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Fluid And Filter Change Intervals . . . . . . . . .
Transmission Fluid Contamination . . . . . . . . . . . . . . . . . . .
Transmission Fluid And Filter Change Procedure. . . . . . . .
Fluid Leak Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Breather . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Stall Test And Neutral
Cool-Down Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
1
2
6
6
7
8
9
10
13
13
17
REMOVING TRANSMISSION
Draining Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disconnecting Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Uncoupling From Driveline, Engine, And Vehicle . . . . . . .
Removing The Transmission . . . . . . . . . . . . . . . . . . . . . . . .
Removing Output Flanges Or Yokes . . . . . . . . . . . . . . . . . .
20
20
22
22
22
PREPARING THE TRANSMISSION FOR
INSTALLATION
Checking Input Components . . . . . . . . . . . . . . . . . . . . . . . .
Installing Output Flange Or Yoke . . . . . . . . . . . . . . . . . . . .
Installing PTO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing Scavenge Pump . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing Fill Tube And Seal . . . . . . . . . . . . . . . . . . . . . . . .
Checking Plugs And Openings . . . . . . . . . . . . . . . . . . . . . .
23
23
24
24
25
25
PREPARING VEHICLE FOR TRANSMISSION
INSTALLATION
Engine, Transmission Adaptation Requirements . . . . . . . . .
Checking Flexplate Drive Assembly . . . . . . . . . . . . . . . . . .
Chassis And Driveline Inspection . . . . . . . . . . . . . . . . . . . .
iii
26
28
29
Paragraph
4–4.
4–5.
SECTION V
5–1.
5–2.
5–3.
5–4.
5–5.
5–6.
5–7.
5–8.
5–9.
5–10.
SECTION VI
6–1.
6–2.
SECTION VII
7–1.
7–2.
Description
Page
Cooler, Filter, And Lines . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30
31
INSTALLING TRANSMISSION
INTO VEHICLE
Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting To Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing Transmission Mounting Components . . . . . . . . .
Coupling To Driveline . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting Power Takeoff Controls . . . . . . . . . . . . . . . . . .
Connecting Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting Speedometer Drive . . . . . . . . . . . . . . . . . . . . . .
Connecting Electrical Components . . . . . . . . . . . . . . . . . . .
Filling Hydraulic System . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
35
35
36
36
36
37
37
38
39
39
CHECKS AND ADJUSTMENTS
Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Road Test And Vehicle Operation Checklist . . . . . . . . . . . .
40
42
CUSTOMER SERVICE
Owner Assistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Literature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
iv
44
44
PREFACE
This handbook is a mechanic’s reference for removing, installing, or maintaining an
MD 3070PT Automatic Transmission. All features of the transmission and the vehicle involved in installation procedures are discussed. The information presented will
help the mechanic remove, install, and maintain the transmission in a manner that
assures satisfactory operation and long service life. For additional detailed information, refer to the appropriate transmission service manual and electronic controls
troubleshooting manual.
TRADEMARKS USED
DEXRON® is a registered trademark of General Motors Corporation.
Pro-Link® is a registered trademark of Microprocessor Systems, Inc.
v
MD 3070PT
SEVEN-SPEED WITH TRANSFER CASE, CLOSE RATIO, POWER TAKEOFF
MAIN HOUSING MODULE
MAIN HOUSING
C3 CLUTCH
C4 CLUTCH
C5 CLUTCH
FRONT SUPPORT/OIL PUMP MODULE
FRONT SUPPORT
OIL PUMP
CONVERTER MODULE
TURBINE
PUMP
STATOR
LOCKUP
CLUTCH/DAMPER
MAIN SHAFT MODULE
MAIN SHAFT
P2 SUN
P3 SUN
vi
P3 MODULE
P2 MODULE
CONVERTER HOUSING
MODULE
PTO DRIVE GEAR
CONVERTER HOUSING
ROTATING CLUTCH MODULE
TURBINE SHAFT
C1 CLUTCH
C2 CLUTCH
TRANSFER CASE MODULE
C6 CLUTCH
TORQUE PROPORTIONING
DIFFERENTIAL
DIFFERENTIAL CLUTCH
P1 MODULE
CONTROL MODULE
HYDRO-ELECTRONIC CONTROLS
H01708
MD 3070PT TRANSMISSION RIGHT FRONT-VIEW
MD 3070PT TRANSMISSION LEFT REAR-VIEW
E01707.02
vii
MD 3070PT TRANSMISSION BOTTOM-VIEW
C6
C3
C5
LU
MAIN
C2
C4
C1
V01725
MD 3070PT TRANSFER CASE FRONT-VIEW
MAIN
C7
T-CASE
CONNECTOR
V01726
viii
PREVENTIVE
MAINTENANCE
SECTION
I
1–1. PERIODIC INSPECTION AND CARE
Clean and inspect the exterior of the transmission at regular intervals. Severity of
service and operating conditions determine the frequency of these inspections.
Inspect the transmission for:
•
•
•
•
•
•
loose bolts — transmission and mounting components
fluid leaks — repair immediately
loose, dirty, or improperly adjusted throttle sensor linkage
damaged or loose hoses
worn, frayed, or improperly routed electrical harnesses
worn or out-of-phase driveline U-joints and slip fittings
CAUTION: When welding on the vehicle:
• DO NOT WELD on the vehicle without disconnecting from
the ECU all control system wiring harness connectors.
• DO NOT WELD on the vehicle without disconnecting ECU
battery power and ground leads.
• DO NOT WELD on any control components.
• DO NOT CONNECT welding cables to any control components.
A label describing on-vehicle welding precautions is available from your authorized
Allison service dealer and should be installed in a conspicuous place. A vehicle used
in a vocation that requires frequent modifications or repairs involving welding must
have an on-vehicle welding label.
1–2. IMPORTANCE OF PROPER TRANSMISSION FLUID LEVEL
Transmission fluid cools, lubricates, and transmits hydraulic power.
Always maintain proper fluid level. If fluid level is too low, the torque
converter and clutches do not receive an adequate supply of fluid and the
transmission overheats. If the level is too high, the fluid aerates — causing
the transmission to shift erratically and overheat. Fluid may be expelled through the
breather or dipstick tube when the fluid level is too high.
1
1–3.
TRANSMISSION FLUID CHECK
a. Electronic Fluid Check Procedure. If the transmission you are
maintaining has an oil level sensor, fluid level information can be displayed on the shift selector. If the transmission does not have an oil level
sensor, refer to Paragraph 1–3, Step b. Manual Fluid Check Procedure.
• Displaying Fluid Level Information. Use the following procedure to display
fluid level information:
— For a pushbutton shift selector:
Simultaneously press the ↑ (Up) and ↓ (Down) arrow buttons.
— For a lever shift selector:
Press the MODE button.
• Oil (Fluid) Level Mode. A two minute countdown begins after entering oil
level mode. The display flashes and an 8, 7,...1 count occurs during the two
minute countdown. Oil level information displays after the countdown and
when the following conditions are met:
— Engine at idle
— Sump oil at operating temperature
— Transmission output shaft stopped
— Transmission in neutral
— Oil level sensor functioning properly
• Shift Selector Display. After two minutes the shift selector will display the
fluid level data as in the following examples:
CODE
MEANING OF CODE
OL OK OK
Oil level is correct
OL LO 01
Oil level is one quart low — or as many quarts as needed
OL HI 01
Oil level is one quart high — or as many quarts as overfilled
The shift selector can only display two characters at a time. One character is displayed
under the MONITOR label and one under the SELECT label. The oil level
information is sequentially displayed as in the following examples:
If the oil level is correct —
2
Select
Monitor
O
L
O
K
O
K
If the oil level is low —
If the oil level is high —
Select
Monitor
O
L
L
O
O
1
Select
Monitor
O
L
H
I
O
1
NOTE:
Failure to meet any of the above conditions stops the two minute
countdown. One of the following codes displays on the shift selector
to show the reason for the countdown interruption. Once all conditions
have been met, the countdown resumes where it stopped.
CODE
CAUSE OF CODE
50
59
65
70
79
89
95
Engine rpm too low
Engine rpm too high
Neutral not selected
Sump oil temperature too low
Sump oil temperature too high
Output shaft rotation
Oil level sensor failure
If oil level cannot be checked and a code is issued indicating the reason, the following
type display appears:
Select
Monitor
O
L
–
–
5
9
NOTE:
Report sensor failure to a distributor or dealer in your area. Check the
telephone directory for an Allison Transmission distributor or dealer
near you.
3
• Exiting The Oil Level Display Mode
— For a pushbutton shift selector:
Press any range selection button.
— For a lever shift selector:
Press the DISPLAY MODE button, or select a range.
b. Manual Fluid Check Procedure. Clean all dirt from around the end of the fluid
fill tube before removing the dipstick. Do not allow dirt or 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. Check the fluid level using the following procedure and record the level in your maintenance log.
WARNING: When checking the fluid level, be sure the transmission
is in N (Neutral), the parking brake and/or emergency brake is set
properly, and the wheels are chocked. Unexpected and possible sudden
vehicle movement may occur if these precautions are not taken.
c. Cold Check Procedure. The purpose of the cold check is to determine if the
transmission has enough fluid to be operated safely until a hot check can be made.
CAUTION: The fluid level rises as fluid temperature increases.
DO NOT fill above the “COLD RUN” band if the transmission fluid is
below normal operating temperatures.
• Park the vehicle on a level surface. Apply the parking brake and chock the
wheels.
• Run the engine for at least one minute. Shift to D (Drive), then to N (Neutral),
and then shift to R (Reverse) to fill the hydraulic system. Finally, shift to N
(Neutral) and allow the engine to idle (500–800 rpm).
• With the engine running, remove the dipstick from the tube and wipe clean.
• Insert the dipstick into the tube and remove. Check the fluid level reading.
Repeat the check procedure to verify the reading.
• 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. If the
fluid level is not within the “COLD RUN” band, add or drain as necessary to
bring it to the middle of the “COLD RUN” band.
• Perform a hot check at the first opportunity after the normal operating
temperature of 71°C–93°C (160°F–200°F) is reached.
4
d. Hot Check Procedure.
CAUTION: The fluid must be hot to ensure an accurate check. The
fluid level rises as temperature increases.
• Operate the transmission in D (Drive) range until normal operating
temperature is reached:
— sump temperature 71°C–93°C (160°F–200°F)
— converter-out temperature 82°C–104°C (180°F–220°F)
• Park the vehicle on a level surface and shift to N (Neutral). Apply the parking
brake and chock the wheels. Allow the engine to idle (500–800 rpm).
• With the engine running, remove the dipstick from the tube and wipe clean.
• Insert the dipstick into the tube and remove. Check fluid level reading. Repeat
the check procedure to verify the reading.
NOTE:
Safe operating level is within the “HOT RUN” band on the dipstick,
Figure 1–1. 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 as necessary
to bring the fluid level to within the “HOT RUN” band.
HOT
FULL
6.35 mm
(0.250 in.)
HOT
ADD
BOTTOM OF
FILL TUBE
101.6 mm
(4.00 in.)
45.7 mm
(1.80 in.)
5.9 mm (0.23 in.)
SPLIT LINE
Calibration level marking
locations with respect to
transmission control module
split line and fill tube
SCALE NONE
86.6 mm
(3.41 in.)
COLD
ADD
COLD
FULL
63.5 mm
(2.50 in.)
TO BE
DETERMINED BY
INSTALLATION
Figure 1–1. MD 3070PT Dipstick Markings
5
V01727
e. Consistency of Readings. Always check the fluid level at least twice and with
the engine running. Consistency is important to maintaining accuracy of the reading.
If inconsistent readings persist, check the transmission breather to be sure it is clean
and unclogged.
1–4. KEEPING FLUID CLEAN
Prevent foreign material from entering the transmission by using clean containers,
fillers, etc. Lay the dipstick in a clean place while filling the transmission.
CAUTION: Containers or fillers that have been used for antifreeze
solution or engine coolant must NEVER be used for transmission
fluid. Antifreeze and coolant solutions contain ethylene glycol which,
if put into the transmission, can cause the clutch plates to fail.
1–5. FLUID RECOMMENDATIONS
Hydraulic fluid (oils) used in the transmission are important influences on
transmission performance, reliability, and durability. DEXRON®-III fluid is
recommended for on-highway applications. Type C-4 fluids are recommended for
severe duty and off-highway applications.
DEXRON®-III fluid is also qualified as Type C-4 fluid. To ensure the fluid is qualified
for use in Allison transmissions, check for a DEXRON®-III or C-4 fluid license or
approval numbers on the container, or consult the lubricant manufacturer. Consult
your Allison Transmission dealer or distributor before using other fluid types. Fluid
types such as Type F and universal farm fluids may or may not be properly qualified
for use in your Allison transmission.
CAUTION: Disregarding minimum fluid temperature limits can
result in transmission malfunction or reduced transmission life.
When choosing the optimum viscosity grade of fluid to use, duty cycle, preheat
capabilities, and/or geographical location must be taken into consideration. Table 1–1
lists the minimum fluid temperatures at which the transmission may be safely
operated without preheating the fluid. Preheat with auxiliary heating equipment or by
running the equipment or vehicle with the transmission in Neutral for a minimum of
20 minutes before attempting range operation.
6
Table 1–1. Transmission Fluid Operating
Temperature Requirements
Ambient Temperature Below
Which Preheat is Required
Viscosity Grade
MIL-L-46167
MIL-L-2104D
SAE 0W-20
DEXRON®-III
SAE 10W
SAE 10W-30
SAE 15W-40
SAE 30W
SAE 40W
Celsius
–51
–32
–30
–27
–20
–20
–15
0
10
Fahrenheit
–60
–25
–22
–17
–4
–4
5
32
50
1–6. TRANSMISSION FLUID AND FILTER CHANGE INTERVALS
a. Frequency. Transmission fluid and filter change frequency is determined by the
severity of transmission service and the filter equipment installed. Table 1–2 is a
general guide. More frequent changes may be necessary when operating conditions
create high levels of contamination or overheating.
Table 1–2. Transmission Fluid and Filter Change Table
Transmission
Fluid and Filter Change Interval
MD3070PT (On-highway)
After the first 8000 km (5000
miles); thereafter 40 000 km
(25,000 miles) or 18 months*
MD3070PT (Off-highway)
After first 500 hours; thereafter,
1000 hours max, or 18 months*
*Whichever comes first.
b. Abnormal Conditions. Transmission fluid must be changed whenever there is
evidence of dirt or a high temperature condition. A high temperature condition is indicated by the transmission fluid being discolored or having a strong odor, or by
fluid analysis. Local conditions, severity of operation, or duty cycle may require
more or less frequent fluid or filter change intervals.
c. Fluid Analysis. Transmission protection and fluid change intervals can be optimized by monitoring fluid oxidation according to the tests and limits shown in Table
7
1–3. Consult your local telephone directory for fluid analysis firms. To ensure consistent and accurate fluid analysis, use only one fluid analysis firm. Refer to the
Technician’s Guide for Automatic Transmission Fluid, SA2055, for additional information.
Table 1–3.
Fluid Oxidation Measurement Limits
Test
Limit
Viscosity
±25% change from new fluid
Carbonyl Absorbance
+0.3 A*/0.1 mm change from new fluid
Total Acid Number
+3.0 change from new fluid
Solids
2% by volume maximum
* A= Absorbance Units
1–7. TRANSMISSION FLUID CONTAMINATION
a. Fluid Examination. At each fluid change, examine the drained fluid for evidence
of dirt or water. A normal amount of condensation will appear in the fluid during operation.
b. Water. Obvious water contamination of the transmission fluid or transmission
fluid in the cooler (heat exchanger) water indicates a leak between the water and
fluid areas of the cooler. Inspect and pressure test the cooler to confirm the leak.
Replace leaking coolers.
NOTE:
Cooler water can also be contaminated by engine oil; be sure to locate
the correct source of cooler water contamination.
c. Engine Coolant. Engine coolant in the transmission hydraulic system requires
immediate action to prevent malfunction and possible serious damage. Completely
disassemble, inspect, and clean the transmission. Remove all traces of the coolant,
and varnish deposits resulting from engine coolant contamination. Replace friction
clutch plates contaminated with engine coolant (ethylene glycol).
d. Metal. Metal particles in the fluid (except for the minute particles normally
trapped in the oil filter) indicate internal transmission damage. If these particles are
found in the sump, the transmission must be disassembled and closely inspected to
find their source. Metal contamination requires complete transmission disassembly.
Clean all internal and external hydraulic circuits, cooler, and all other areas where
the particles could lodge.
8
CAUTION: If excessive metal contamination has occurred, replace
the oil cooler and all bearings in the transmission.
1–8. TRANSMISSION FLUID AND FILTER CHANGE PROCEDURE
NOTE:
Do not drain the transmission fluid if only filters are being replaced.
a. Drain Fluid.
• Drain the fluid when the transmission is at operating temperature —
71°C–93°C (160°F–200°F). Hot fluid flows quicker and drains more
completely.
• Remove the drain plug from the control module and the transfer case, and
allow the fluid to drain into a suitable container.
• Examine the fluid as described in Paragraph 1–7.
b. Replace Filters.
• Remove twelve bolts, two filter covers, two O-rings, two square cut seals, and
two filters from the bottom of the control module (refer to Figure 1–2).
NOTE:
Lubricate the O-ring inside the filter cartridges.
• Pre-lube and install an O-ring on each cover assembly. Install a square cut seal
on each cover assembly. Install the filters onto the cover assemblies.
CAUTION: Do not use the bolts to draw filter covers to the sump.
This can damage the covers, seals, or sump.
• Install filter and cover assemblies into the filter compartment. Align each
filter/cover assembly with the holes in the channel plate/sump. Push the cover
assemblies in by hand to seat the seals.
• Install six bolts into each cover and tighten to 51–61 N·m (38–44 lb ft).
• Replace drain plug O-rings. Install the plugs and tighten to 25–32 N·m
(18–24 lb ft).
9
MAIN
LUBE
FILTER
O-RING
SQUARE
CUT SEAL
COVER
BOLT
LUBE
MAIN
V01728
Figure 1–2. Location of Filters for Service
c. Refill Transmission. The amount of refill fluid is less than the amount used for
the initial fill. Fluid remains in the external circuits and transmission cavities after
draining the transmission.
After refill, check the fluid level using the procedure described in Paragraph 1–3.
Table 1–4. Transmission Fluid Capacity
Transmission
Type
MD 3070PT
Oil Sump
Description
standard
(7.00 in.)
Initial Fill*
Liters
Quarts
PTO
yes
37
39
Refill*
Liters Quarts
30
*Approximate quantity; does not include external lines and cooler hose.
1–9. FLUID LEAK DIAGNOSIS
a. Finding the Leak.
(1) Identify the fluid. Determine whether it is engine oil, automatic
transmission fluid, or hydraulic fluid from a specific vehicle system.
10
32
(2) Operate the vehicle to reach normal operating temperature and park the
vehicle. Inspect the vehicle to identify the source of the leak. Refer to the
following list for possible points of fluid leaks and their causes.
• Transmission mating surfaces:
— Attaching bolts not correctly tightened
— Improperly installed or damaged gasket
— Mounting face damaged
• Housing leak:
— Filler pipe or plug seal damaged or missing
— Filler pipe bracket dislocated
— Oil cooler connector fittings loose or damaged
— Output shaft seals worn-out or damaged
— Pressure port plugs loose
— Porous casting
• Leak at converter end:
— Converter seal damaged
— Seal lip cut (check converter hub for damage)
— Garter spring missing from seal
— Converter leak in weld area or O-ring seal
— Porous casting
• Fluid comes out of vent or fill tube:
— Overfilled — incorrect dipstick
— Plugged vent
— Water or coolant in fluid — fluid will appear milky
— Incorrect electronic fluid level indication
— Drain-back holes plugged
(3) Visually inspect the suspected area. Inspect all the gasket mating surfaces for
leaks.
(4) If the leak still cannot be identified, then clean the suspected area with a
degreaser, steam, or spray solvent. Clean and dry the area. Operate the
vehicle for several miles at varying speeds. Inspect the vehicle for leaks. If
the source of the leak is still not identified, use powder method or black
light and dye method as explained below.
b. Powder Method.
• Clean the suspected area.
• Apply an aerosol-type white powder.
• Operate the vehicle under normal operating conditions.
11
• Visually inspect the suspected area and trace the leak path over the white
powder surface to the source.
NOTE:
A dye and black light kit is available for finding leaks. Refer to the
manufacturer’s directions when using the kits. See kit directions for the
color of the fluid and dye mix.
c. Black Light and Dye Method.
• Pour the specified amount of dye into the transmission fill tube.
• Operate the vehicle in normal operating conditions.
• Direct the black light toward the suspected area. The dyed fluid will appear as
a brightly colored path leading to the source.
d. Repairing the Leak.
Once the leak has been traced back to its source, inspect the leaking part for the
following conditions, and repair the leaking part.
• Gaskets:
— Fluid level/pressure is too high
— Plugged vent or drain-back holes
— Improperly tightened fasteners or dirty/damaged threads
— Warped flanges or sealing surfaces
— Scratches, burrs, or other damage to a sealing surface
— Damaged or worn-out gasket
— Cracked or porous casting
— Improper sealant used (where applicable)
• Seals:
— Fluid level/pressure is too high
— Plugged vent or drain-back holes
— Damaged seal bore
— Damaged or worn-out seal
— Improper installation
— Cracks in component
— Output shaft surface scratched, nicked, or damaged
— Loose or worn-out bearing causing excess seal wear
• Sealing Flange:
— Inspect the sealing flange for bends; replace the sealing flange if bent.
12
1–10. BREATHER
a. Location and Purpose. The breather is located on top of the transmission con-
verter housing. The breather prevents air pressure buildup within the transmission
and its passage must be kept clean and open.
b. Maintenance. The amount of dust and dirt encountered will determine the fre-
quency of breather cleaning. Use care when cleaning the transmission. DO NOT
SPRAY STEAM, WATER, OR CLEANING SOLUTION DIRECTLY AT THE
BREATHER. Spraying steam, water, or cleaning solution directly at the breather
can force the water or cleaning solution into the transmission.
c. Replacement. Always use a wrench of the proper size to remove or replace the
breather. Pliers or a pipe wrench can crush or damage the stem and produce metal chips
which could enter the transmission. Tighten the breather to 12–16 N·m (9–12 lb ft).
1–11. TROUBLESHOOTING
a. DO NOT SHIFT Light.
The DO NOT SHIFT light is usually located on the vehicle’s instrument panel.
When the light is “ON” and accompanied by eight seconds of short beeps from the
shift selector, shifts are being restricted by the ECU.
• This occurs when the ECU senses abnormal conditions.
• During this time, the “Select” digit on the shift selector is blank.
• The transmission may continue to operate with inhibited shifting.
• The ECU will not respond to shift selector requests.
• Direction changes and shifts to and from neutral will not occur. If the lever
shift selector is moved while DO NOT SHIFT is indicated, a continuous
alarm sounds. This alarm continues until the shifter is moved back to the
position it was in when the light came on initially.
• If ignition is turned “OFF” and then “ON” while the DO NOT SHIFT light is
displayed, the transmission will remain in neutral until the code is cleared.
Any time the DO NOT SHIFT light is displayed, the ECU logs a diagnostic code in
memory. These diagnostic codes can be accessed through the shifter display or a
diagnostic tool.
NOTE:
Diagnostic codes can be logged without illuminating the DO NOT
SHIFT light. This occurs when the ECU senses a problem, but
determines the problem won’t cause immediate transmission damage
or dangerous performance.
13
b. Diagnostic Codes Overview.
Table 1–5.
Diagnostic Codes Overview
Ignition
Code List Main Code Sub Code
Active
Cycle
Event
Position
Indicator
Counter
Counter
d1
21
12
YES
00
10
d2
41
12
YES
00
04
d3
23
12
NO
08
02
d4
34
12
NO
13
01
d5
56
11
NO
22
02
Displayed on shift selector.
YES = MODE Accessible by Pro-Link®
ON Displayed diagnostic tool only.
Diagnostic codes are listed in memory. Up to five codes can be stored, with the most
recent code listed first.
Diagnostic codes consist of a two-digit main code and a two-digit sub code.
• Main codes are listed first and provide the general condition or area of fault
detected by the ECU.
• Sub codes are listed second and provide specific areas or conditions within
the main code that caused the occurrence.
• Example — Code 13 12: 13 indicates a problem with ECU voltage; 12
indicates the problem was caused by low voltage.
• Example — Code 21 12: 21 indicates a problem with throttle position sensor
signal; 12 indicates the throttle position sensor signal was low.
If the condition causing the diagnostic code still exists, it’s identified by “YES” in
the Active Indicator area. If the condition causing the diagnostic code is no longer
present, it’s identified by “NO” in the Active Indicator area.
When using the shift selector to retrieve trouble codes, the illumination of the
MODE ON indicator on the shift selector indicates that the code displayed is
currently active. If the MODE ON indicator is not illuminated with the displayed
code, the code is inactive. In the normal operating mode, the MODE ON display
indicates secondary mode operation.
• The Ignition Cycle Counter determines when inactive diagnostic codes are
automatically cleared from the code list. The counter is incremented each
time a normal ECU powerdown occurs (ignition turned off). Inactive codes
are cleared from the code list after the counter reaches 25.
14
• The Event Counter counts the number of occurrences of a diagnostic code. If
a code is already in the code list and the code is again detected, that code is
moved to position D1, the active indicator is turned on and the Ignition Cycle
Counter is cleared, and 1 is added to the Event Counter.
• You can access the ignition cycle counter and event counter information
through Pro-Link® diagnostic tool only.
c. Clearing The Trouble Codes Using Shift Selector.
During installation, “false” codes can be recorded in the electronic control’s
memory. You must clear these codes prior to road testing the vehicle. Use the shift
selector to clear the codes. Refer to Figure 1–3.
• Enter the diagnostic mode on pushbutton selectors by pressing the ↑ (Up)
and ↓ (Down) arrow buttons simultaneously. (Press twice if there is an oil
level sensor present.)
• Enter the diagnostic mode on lever selectors by momentarily pressing the
DISPLAY button. (Press twice if there is an oil level sensor present.)
• To clear all active indicators, press and hold the MODE button approximately
3 seconds until a tone sounds.
• To remove all codes, press and hold the MODE button for approximately 10
seconds until the shift selector tone sounds twice.
d. Retrieving Troubleshooting Codes.
During installation, “false” diagnostic codes can be recorded in the electronic
control’s memory. Clear these codes before road testing the vehicle. After road
testing the vehicle, check for the codes. Retrieve the codes by using the shift
selector. Refer to Figure 1–3.
• Enter diagnostic mode.
• The display will list the code’s logged position (d1, d2, d3, etc.), then follow
with the main code and a sub code (this repeats every 2 seconds until the
MODE button is pushed again).
• Momentarily push the MODE button to move to the next code stored in
memory.
• When you have retrieved all the codes, the display will return to the first code
listed and repeat the sequence. RECORD ALL THE CODES.
NOTE:
You can also use Pro-Link® diagnostic tool to clear and retrieve the
troubleshooting codes. Refer to the Pro-Link® User’s Manual or
SA2828 for specific instructions.
15
HOLD
OVERRIDE
BUTTON
SELECT
POSITION
SELECT
R
MONITOR
R
MONITOR
N
MODE ON
N
MODE ON
D
SELECT
MODE ON
R
MODE
MODE
ID
N
D
6
5
5
4
MODE
D
3
4
MODE
3
2
2
1
1
DISPLAY
BUTTON
PUSHBUTTON
SELECTOR
SEVEN-SPEED
SIX-SPEED
LEVER SELECTOR LEVER SELECTOR
V01458.01
Figure 1–3. Shift Selector
e. Troubleshooting When No Diagnostic Codes Are Present.
• Always start with the basics:
— Make sure the shifter is in the appropriate range.
— Check the fluid level.
— Make sure batteries are properly connected and charged.
— Make sure electrical connections are properly made.
— Check support equipment for proper installation and operation.
• If the shifting process is rough, give the shifts time to “converge” before
assuming there is a problem.
• Refer to the WT Troubleshooting Manual’s “General Troubleshooting of
Performance Complaints” section.
— These troubleshooting charts list a variety of conditions that may or may
not relate to the Electronic Control.
— Some conditions and suggested checks include mechanical and hydraulic
items.
• If the troubleshooting charts refer you to an Electronic Control check, use the
diagnostic code troubleshooting information that best applies to the situation.
• Use the WT’s individual clutch-apply circuit pressure taps when necessary.
f. Troubleshooting Intermittent Diagnostic Codes.
Intermittent codes are a result of conditions which are not always present.
When conditions causing the code exist, the code is logged in memory. The code
stays in memory until it’s manually cleared or cycled out.
16
When intermittently occurring codes exist, check for the following items:
• Dirty, damaged harness connectors and terminals
• Terminals not fully seated in connectors
• Damaged harnesses (due to poor routing, chafing, excessive heat, tight bends,
etc.)
• Improperly mounted Electronic Control components
• Poor connector seals (where applicable)
• Exposed harness wires
• EMI generating components and accessories
To help locate intermittents, it sometimes helps to place the appropriate tester on the
suspect component or circuit and simulate operating conditions — wiggle, pull,
bump, and bend while watching the tester.
g. Exiting The Diagnostic Mode.
• Do nothing; wait until the calibrated time has passed and the system
automatically returns to normal operation.
• Using a pushbutton shift selector, simultaneously press the ↑ (Up) and
↓ (Down) arrow buttons.
• Using a pushbutton shift selector, press D (Drive), N (Neutral), or
R (Reverse).
• Using a lever shift selector, press the DISPLAY MODE button.
• Using a lever shift selector, move the shift selector to any position other than
the one it was in when the diagnostic display mode was activated.
1–12. TRANSMISSION STALL TEST AND NEUTRAL
COOL-DOWN CHECK
a. Purpose. When a vehicle is performing unsatisfactorily, use the stall
test to determine if the malfunction is in the engine or in the transmission. The neutral cool-down check uses a two-minute cooling period after the stall to gather fluid temperature data for troubleshooting.
b. Transmission Stall Test Procedure.
• The engine stall rpm under load is compared to the engine manufacturers’
specified rpm for the stall test.
17
NOTE:
The engine manufacturer’s test data must be available for the stall test.
This data can be obtained from the engine manufacturer or from the
equipment dealer or distributor. You must know the stall speed of the
engine/torque converter combination. If you have complete engine
information such as model, manufacturer, and the installed torque
converter information, the Allison Transmission distributor or dealer
can determine the stall speed of the engine/torque converter
combination installed in your vehicle by using SCAAN.
NOTE:
The Pro-Link® diagnostic tool can read sump temperature to show
when normal operating temperatures have been reached and the
temperature has stabilized.
• Connect a tachometer (the Pro-Link® diagnostic tool can read engine rpm) of
known accuracy to the engine and install a temperature probe into the
converter-out (to cooler) hose. Bring the transmission to the normal operating
temperature range of 71°C–93°C (160°F–200°F).
WARNING: Securely block the vehicle from moving — chock the
vehicle wheels and apply the parking brake and service brake. Warn
personnel to keep clear of the vehicle and its travel path. Failure to do
so can cause serious injury.
CAUTION: DO NOT conduct a stall test in R (Reverse) range. The
torque produced in reverse range can damage the vehicle driveline or
axle.
• Shift to any forward range.
CAUTION: The stall condition causes a rapid rise in fluid temperature; never maintain the stall for more than 30 seconds at any one
time. Do not let the converter-out fluid temperature exceed 149°C
(300°F). During stall conditions, converter-out temperatures rise much
faster than internal fluid temperature. Do not use internal fluid
temperature to determine the length of the stall condition. If the stall
test is repeated, do not let the engine overheat.
• With the vehicle blocked and wheels chocked, parking and service brakes
applied, hold the engine at wide-open throttle. Record the maximum engine
rpm. Do not allow converter-out fluid to exceed 149°C (300°F).
18
• Reduce engine rpm to idle and shift to N (Neutral).
• Raise engine speed between 1200 and 1500 rpm for 2–3 minutes to allow
transmission to cool down.
• Monitor converter-out temperature. If transmission temperature doesn’t
decrease, refer to Section 1–12d.
c. Stall Test Results.
NOTE:
Environmental conditions, such as ambient temperature, altitude,
engine accessory loss variations, etc., affect the power input to the
converter. Under such conditions, stall speed can vary from specification by ±150 rpm and still be accepted as within normal range.
• If engine stall speed is more than 150 rpm below the stall speed specified by the
engine manufacturer, an engine problem is indicated. If engine stall speed is
more than 150 rpm above specification, a transmission problem is indicated,
such as slipping clutches, cavitation, aeration, or torque converter failure.
• An extremely low stall speed (such as 33 percent of the specified engine stall
rpm), during which the engine does not smoke, could indicate a freewheeling
stator in the converter.
• Perform a neutral cool-down check if engine stall-speed tests meet specifications, but cause the transmission fluid to overheat.
• If the engine stall speed meets the specification and the cool-down check shows
that transmission fluid cools properly, an electronic control problem may exist.
Refer to the latest version of WT Troubleshooting Manual TS2470EN.
d. Neutral Cool-Down Check Procedure.
• The neutral cool-down check determines if the transmission fluid cools
following an engine load condition. Perform this check immediately after the
maximum engine rpm has been recorded in the stall test.
• Record the converter-out fluid temperature.
• Reduce the engine rpm to idle and shift to N (Neutral). Run the engine at
1200–1500 rpm for two minutes to cool the fluid.
• At the end of two minutes, record the converter-out fluid temperature.
Converter-out fluid temperature should return to within the normal operating
temperature range.
• If the fluid does not cool during the two minute cool-down check, a stuck
stator may be the source of the problem.
NOTE:
You may use the Pro-Link® diagnostic tool to perform stall test and clutch test
procedures. Refer to the Pro-Link® User’s Manual for specific instructions.
19
REMOVING
TRANSMISSION
S ECTION
II
2–1. DRAINING TRANSMISSION
Drain the transmission fluid before removing the transmission from the vehicle. The
transmission should be warm and the fluid allowed to drain completely.
• Remove the drain plug from the control module and the transfer case.
Examine the drained fluid for evidence of contamination — refer to Paragraph
1–7. Reinstall the drain plug.
• Remove transmission fill tube if it interferes with transmission removal.
NOTE:
A significant amount of fluid may drain from the hydraulic lines when
they are disconnected from the transmission.
• Disconnect all hydraulic lines from the transmission. Remove the lines from
the vehicle if they interfere with transmission removal. Plug all openings to
keep dirt from entering the hydraulic system.
2–2. DISCONNECTING CONTROLS
• Disconnect or completely remove controls. If controls are not removed from
the transmission, position them so that they do not interfere with transmission
removal.
• Disconnect the external wiring harness at the feedthrough harness connector.
On models prior to 1995, disconnect the external wiring harness at the
transmission connector. Prevent dirt or moisture from entering a disconnected
connector. Position the wiring harness so it does not interfere with
transmission removal.
• Disconnect the engine and output speed sensors.
20
FEEDTHROUGH
HARNESS
MOUNTING
PADS
ASSEMBLY PADS
BREATHER
COOLER
PORTS
NAMEPLATE
ENGINE SPEED SENSOR
SCAVENGE PUMP
E01707.03
Figure 2–1. MD 3070PT Disconnect Locations
TRANSMISSION CONNECTOR
V01444.01
Figure 2–2. Transmission Connector (Prior to S/N 6510032369)
21
2–3. UNCOUPLING FROM DRIVELINE, ENGINE, AND VEHICLE
• Disconnect the vehicle drive shafts from the transmission output flanges or
yokes. Position the disconnected shaft to avoid interference when removing
the transmission.
• Disconnect PTO connections such as:
— PTO hydraulic hoses
— PTO-powered equipment drive shaft
• If transmission mountings support the rear of the engine, place a jack or other
support under the engine.
• Securely support the transmission with a hoist, jack, or other suitable removal
equipment.
• Remove all bolts, nuts, washers, spacers, and supports that attach the
transmission to the vehicle and the engine.
2–4. REMOVING THE TRANSMISSION
• Move the transmission away from the engine, approximately 110 mm (4.35
inches), until it is completely clear of the engine. If used, remove the adapter
ring and/or gasket.
• Raise or lower the transmission as necessary to remove it from the vehicle.
2–5. REMOVING OUTPUT FLANGES OR YOKES
MD 3070PT outputs use two large self-locking nuts. A special procedure must be
followed for removal and installation of the nut.
CAUTION: The use of an impact wrench on the MD 3070PT output
nut requires a means to hold the flange. Failure to hold the flange can
cause internal damage to the transmission.
• Remove dirt and burrs from the shaft threads. Then loosen the nut until there
is about 1⁄16 inch gap between the nut and flange.
• Check the running torque as the nut is being removed. The running torque
must be at least 19.5 N·m (14 lb ft). Discard the nut if it does not meet the
running torque limit.
22
S ECTION
III
3–1.
PREPARING THE
TRANSMISSION FOR
INSTALLATION
CHECKING INPUT COMPONENTS
a. Bolt Holes. Check all bolt holes on the front of the flywheel/converter cover/
flexplate adapter. The threads must be undamaged and the holes free of chips or
foreign material.
b. Pilot Boss. Check the pilot boss (at the center of the flywheel) for damage or
raised metal that prevents free entry into the crankshaft hub (adapter).
c. Starter Ring Gear. Check the starter ring gear for excessive wear or damage.
d. Transmission Mounting Flange. Check the transmission mounting flange for
raised metal, dirt, or if used, pieces of gasket material.
e. Transmission-to-Engine Mounting Flange. Inspect the transmission-to-
engine mounting flange for raised metal, burrs, or pieces of gasket material (if used).
Remove any of these defects. Inspect the threaded holes for damaged threads.
3–2. INSTALLING OUTPUT FLANGE OR YOKE
a. Output Oil Seals. Check the output oil seals for leaks or damage. Replacement
instructions are in the MD Series Service Manual SM2148EN. Lubricate the oil seal
with high-temperature grease or transmission fluid.
CAUTION: DO NOT attempt to polish the oil seal contact surface on
the flange or yoke. Scratches or machine type lead can cause the seal to
leak.
b. Check Yokes. Check each flange or yoke for damage or wear. The oil seal con-
tact surface must be smooth and regular to prevent oil leaking past the seal. Rotate
the flange during installation to prevent damage to the oil seal lip.
c. Install Output Yokes. Install the rear output yoke on the rear output shaft. Tight-
en the nut to 610–815 N·m (450–600 lb ft). Follow the same procedure for the front
output yoke.
23
3–3. INSTALLING PTO
Access to the PTO mounting pads and the space available to maneuver the
transmission determine whether the PTO should be installed before or after the
transmission is installed.
CAUTION: DO NOT use cork or other soft gaskets to install the PTO.
Use only the shims/gaskets listed in the MD Parts Catalog.
NOTE:
DO NOT use sealing compounds — they are usually incompatible with
automatic transmission fluid.
a. Install Guide Pins — included in the PTO installation kit. Determine the re-
quired position of the guide pins in relation to the mounted position of the PTO. The
guide pins must align with the two blind holes in the PTO. Install two headless guide
pins into the converter-housing PTO pad. Tighten the pins.
b. Install Gasket. Install the special gasket over the guide pins — ribbed surface
away from the transmission.
c. Mount the PTO. Mount the PTO on the guide pins, meshing the PTO driven
gear with the transmission’s PTO drive gear. Retain the PTO by installing a bolt in
the top bolt hole. Install the remaining bolts. Tighten all bolts to 51–61 N·m (38–45
lb ft).
3–4. INSTALLING SCAVENGE PUMP
Determine whether the scavenge pump should be installed before or after the
transmission has been installed.
a. Install the Guide Pins — included in the scavenge pump installation kit. Deter-
mine the required position of the guide pins in relation to the mounted position of
the scavenge pump. The guide pins must align with the two blind holes in the scavenge pump. Install two headless guide pins into the converter housing scavenge
pump pad. Tighten the pins.
b. Install Gasket. Install the special gasket over the guide pins — ribbed surface
away from the transmission.
c. Mount the Scavenge Pump. Mount the scavenge pump on the guide pins, meshing the scavenge pump with the transmission’s PTO drive gear. Retain the scavenge
pump by installing a bolt in the top bolt hole. Install the remaining eight bolts, and
tighten the bolts to 51–61 N·m (38–45 lb ft).
24
3–5.
INSTALLING FILL TUBE AND SEAL
a. Location.
• The fill tube may be mounted on either the right or left side. The unused fill
tube provision must have an expansion plug in the fill tube opening.
CAUTION: Install the fill tube brackets with the correct length bolt.
Too long a bolt may cause cracks and leaks in the main housing. Refer
to the MD 3070PT Catalog for the correct bolt.
b. Installation. Install the fill tube seal into the main housing. Insert the fill tube
through the seal. Align the tube bracket with its bolt location. Install the fill tube bolt
and tighten to 24–29 N·m (18–21 lb ft). Install the expansion plug in the unused fill
tube hole. Tighten the plug to 1–3 N·m (9–26 lb in.).
3–6. CHECKING PLUGS AND OPENINGS
Carefully check all sides and the bottom of the transmission for loose or missing
plugs.
a. Pressure Plugs. Check that .4375–20 UNF-2A pressure plugs are tightened to
10–13 N·m (7–10 lb ft).
b. Fluid Drain Plug. Check that the drain plug is tightened to 25–32 N·m
(18–24 lb ft).
c. Cleanliness. Check the openings into which the cooler lines connect for defor-
mities or obstructions. Check the transmission electrical connectors for cleanliness.
Clean electrical connections with an LPS cleaner only.
25
S ECTION
IV
PREPARING VEHICLE
FOR TRANSMISSION
INSTALLATION
4–1. ENGINE, TRANSMISSION ADAPTATION REQUIREMENTS
You must ensure a new transmission installation can be adapted to the vehicle’s
engine. The measurements described in this section ensure correct transmission-toengine adaptation. Refer to Figure 4–1 or 4–2.
a. Measuring Equipment. The following measuring equipment is required:
•
•
•
•
•
600 mm (24 inches) precision caliper
50–100 mm (2–4 inches) telescoping gauge
25–75 mm (1–3 inches) outside micrometer
Dial indicator and mounting attachments — base, posts, and clamps
0–150 mm (0–6 inches) depth micrometer
b. Flywheel Housing Pilot Bore Diameter. The flywheel housing pilot bore
diameter must measure from 447.68–447.81 mm (17.625–17.630 inches)
c. Flywheel Housing Bore Runout. Flywheel housing bore runout cannot exceed
0.51 mm (0.020 inch) TIR.
d. Flywheel Housing Face Squareness. The flywheel housing face cannot be
out-of-square more than 0.51 mm (0.020 inch) TIR.
e. Crankshaft Hub Pilot or Adapter Diameter. The crankshaft hub pilot or
hub adapter pilot diameter must measure between 50.94–50.99 mm (2.006–2.008
inches).
f. Crankshaft Hub Pilot or Adapter Squareness. The crankshaft hub or hub
adapter cannot be out-of-square more than 0.13 mm (0.005 inch) TIR.
g. Crankshaft Hub Pilot or Adapter Concentricity. The crankshaft hub pilot or
the hub adapter pilot concentricity cannot exceed 0.13 mm (0.005 inch) TIR.
26
50.38 mm ± 1.08 mm (1.993 in. ± 0.043 in.)
Design shall result in the flexplate outside
diameter being deflected 0.38 mm (0.0151 in.)
away from engine. See VIEW B for flexplate
adapter design position.
32.63 mm (1.285 in.)
MOUNTING FACE OF ENGINE
FLYWHEEL HOUSING
FLEXPLATE ADAPTER
12-WASHER
HARDENED STEEL
FLYWHEEL HOUSING
SAE STANDARD J617/2
27
Figure 4–1. MD 3070PT Engine Adaptation
STARTER RING GEAR
12-BOLT
FLEXPLATE-TO-FLEXPLATE ADAPTER
M8 X 1.25 X VARIOUS LENGTHS
TORQUE TO 24–29 N•m (17–21 LB FT)
ACCESS HOLE
20-BOLT (MODEL PRIOR TO 1995)
10-BOLT (1995 MODEL)
M8 X 1.25 X 25.0 mm (0.98 in.)
TORQUE TO 24–29 N•m (17–21 LB FT)
VENT HOLES
CRANKSHAFT HUB ADAPTER
0.375-16 UNC-2A IN. SERIES THREAD BOLT
TORQUE TO 49–58 N•m (36–43 LB FT)
FOR M10 X 1.5-6H BOLT
TORQUE TO 51–61 N•m (38–45 LB FT)
CONVERTER HOUSING
ACCESS HOLE
50.76 mm (1.998 in.) Design shall result in the flexplate outside
diameter being deflected 0.38 mm (0.0151 in.) away from
engine. See VIEW A for converter position.
4-FLEXPLATE
WEARPLATE
CRANKSHAFT BOLT (Consult engine manufacturer for
torque requirements.)
R 145.0 mm (5.71 in.) MIN
ENGINE CRANKSHAFT CENTERLINE
VIEW A
TRANSMISSION CONVERTER SPACE CLAIM
VIEW B
ENGINE ADAPTATION REQUIREMENTS
V01719.01
;
;
V01717
Figure 4–2. Converter Axial Location Measurement
h. Flexplate Bolt Hole Flatness. Flexplate flatness in the area of the bolt holes is
not a measurement required for the MD 3070PT transmission.
i. Torque Converter Axial Location. Refer to Figure 4–2. Using depth gauge,
measure from the torque converter housing to the torque converter’s flexplate adapter mounting face.
The torque converter axial location should measure 50.76 mm (1.998 inch).
4–2. CHECKING FLEXPLATE DRIVE ASSEMBLY
a. Flexplate Inspection. Check the flexplate for cracks, distortion, or elongated
bolt holes. Replace a worn or damaged flexplate.
b. Engine Crankshaft End Play. Ensure engine crankshaft end play is within the
engine manufacturer’s specifications.
28
CRANKSHAFT
HUB ADAPTER
STARTER
RING GEAR
WEARPLATE
ENGINE
FLYWHEEL
HOUSING
FLEXPLATE
ASSEMBLY
FLEXPLATE
ADAPTER
TRANSMISSION
V00533.03
Figure 4–3. Arrangement of Adaptation Components
NOTE:
When assembling the flexplate to the crankshaft hub or hub adapter,
ensure the outer flexplate bolt holes are aligned.
c. Flexplate Assembly Installation. Install the flexplate onto the engine crankshaft
hub using the bolts and torque values specified for that engine. Refer to Figure 4–1
for the proper position of an installed flexplate.
4–3. CHASSIS AND DRIVELINE INSPECTION
Inspect the chassis and driveline components for the following conditions, and
correct them as appropriate.
•
•
•
•
Transmission mounts — broken or worn-out
Bolts and other hardware — damaged, missing, or incorrect
Isolators (rubber mounts) — damaged or missing
Driveline angles — runout, balance, or offsets which do not conform to the
manufacturer’s recommendations
• Driveline yoke slip joints:
— freedom of movement
— damaged or worn-out
29
•
•
•
•
•
•
•
— correctly lubricated
— correctly indexed
Driveline midship or hanger bearings — damaged or misaligned
Universal joints:
— freedom of movement
— damaged or worn-out
— correctly lubricated
— correctly indexed
Vehicle differential backlash — manufacturer’s specification
Universal joint coupling — alignment and differential damage
Cross-frame members and rear support members — condition and location
PTO driven equipment shafts and couplings — damaged or misaligned
Auxiliary transmission:
— shaft alignment
— alignment of yoke or flange
— backlash
— fluid leaks
4–4. COOLER, FILTER, AND LINES
a. Inspection. Perform the following and correct any faulty conditions:
• Transmission fluid cooler and related coolant lines:
— Check for contamination — clean and flush as necessary
— Inspect for deterioration
— Inspect for faulty connectors or kinks
— Clean and flush transmission fluid cooler, both coolant and oil sides.
Pressure check both sides using a 276 kPa (40 psi) air supply.
• Hydraulic lines:
— Check for contamination — clean and flush as necessary
— Inspect for deterioration
— Inspect for faulty connectors, or kinks
b. After Overhaul. A complete cleanup of the transmission system after an over-
haul cannot be assumed. Repeated cleaning and flushing may not remove all debris
from the transmission fluid cooler system. Replace the transmission “from cooler”
(lube) filter after 8000 km (5000 miles). Refill the transmission to the correct fluid
level — refer to Paragraph 1–3.
30
4–5. CHECKING CONTROLS
a. Inspection. Inspect the following and correct any faulty conditions:
• Shift selector:
— improper operation
— poor electrical connection
— improper harness routing
• Cab and chassis wiring harness:
— poor connections
— frayed insulation
— wiring damage
• Throttle sensor components:
— freedom of movement
— improper routing
— bellows damage
— improper or loose cable mounting
• PTO controls:
— damage
— wear
— improper operation
— lubrication
• Scavenge pump:
— damage
— wear
— improper operation
— lubrication
• Temperature gauge:
— capillary tube damage (if used)
— sensor damage
• Fluid pressure gauge tubing:
— damage
— kinks
— improper routing
31
b. Throttle Position Sensor (TPS) Adjustment — Using Diagnostic Tool. When
properly installed by the equipment manufacturer, the TPS should not need adjustment.
If TPS adjustment is necessary, confirm that it has been installed to ATD specification
(refer to Figure 4–5). The TPS is self-calibrating and therefore has no optimum closed
throttle or full throttle count value. Idle count should be 50 or higher and full throttle
count 200 or lower. As long as the counts are in the 50 and 200 range with a difference
of 85 to 130 counts between closed and full throttle the TPS is set correctly.
The Pro-Link® diagnostic tool can read TPS counts. Watch the TPS movements as the
controls move it through a full stroke. Be sure the following conditions do not exist:
• misalignment or obstruction to smooth movement through the full stroke
• idle and full throttle positions are not within an error zone
(refer to Figure 4–4)
Error codes occur if the idle position is less than 14 counts or when the full throttle
position is more than 233 counts.
Adjust so total stroke is within
50–200 count band
0 COUNT
233 COUNTS
14 COUNTS
ERROR
ZONE
255 COUNTS
ERROR
ZONE
200 COUNTS
50 COUNTS
APPROX.
19 mm (0.75 in.) STROKE
CLOSED
THROTTLE
FULLY
RETRACTED
(AT REST)
2.5 mm
(0.1 in.)
0 mm
WIDE OPEN
THROTTLE
Total Stroke
CT–WOT
15.2 mm–22.9 mm
(0.6 in.–0.9 in.)
85–130 Counts
FULLY
EXTENDED
40.6 mm
(1.6 in.)
45.7 mm
(1.8 in.)
V00429.05
Figure 4–4. Throttle Position Determination Diagram
32
MOUNTING PROVISION:
Use M6 X 1.00 or .250-20 IN. series bolts
3 places
Torque M6 X 1.00 IN. bolt to 10–13 N•m (84–120 LB IN.)
Torque .250–20 IN. series bolts to 108–132 LB IN.
Mount to a solid frame member. Flatness of
chassis mounting surface must not exceed
0.8 mm (.03").
BENDING LOAD
APPLIED
UNACCEPTABLE INSTALLATION
10.0° MAX INSTALLED
OPERATING ANGLE
IN ALL DIRECTIONS
55.0 mm (2.17")
MIN REQUIRED
FOR CONNECTION
REMOVAL
LOADING IN
TENSION ONLY
ACCEPTABLE INSTALLATION
Attachment must provide freedom
of motion to allow cable loading in
tension only (no bending loads).
WIRING HARNESS
Fuel control must not move
the throttle sensor beyond
the closed throttle position
at any time.
FULLY
EXTENDED
FORCE REQUIRED
26.7 N (6.0 LB) MAX
47.5 mm (1.87")
FULL THROTTLE
118.1 mm (4.65")
R 152.0 mm (6.00") MIN
ALLOWANCE RADIUS
FULLY
RETRACTED
MOUNTING
LENGTH
CLOSED
THROTTLE
95.2 mm (3.75")
OPERATING BAND
22.9 mm (0.9")
118.1 mm
(4.65")
95.2 mm
(3.75")
The location of the clamping bracket relative
to the fuel lever at closed throttle must be
maintained within this range.
93.45 mm (3.679")
87.15 mm (3.431")
30.2 mm (1.19")
Attach to engine or governor housing using
clamp and shims as required. Clamp must
positively lock in cable groove.
HITCH PIN CLIP
ENGINE FUEL LEVER
Fuel lever attachment linkage or bracket must
allow fuel lever to return to closed throttle
position when sensor rod is maintained at full
throttle position. Attach the throttle sensor
directly to the engine fuel lever with no breakover
or yield linkages between the engine fuel lever
shaft and the attachment point of the throttle
sensor.
CLOSED THROTTLE
183.1 mm (7.21") MAX
FULL THROTTLE
SAME AS WITHOUT SLIP LINK
160.2 mm (6.31") MIN
FULLY EXTENDED
38.1 mm (1.50")
HITCH PIN CLIP
FULLY RETRACTED
OPTIONAL THROTTLE SENSOR ASSEMBLY WITH SLIP LINK
V00430.01
Figure 4–5. Hitch Pin Throttle Position Sensor Installation Diagram
33
c. Hitch Pin Throttle Position Sensor Installation.
• Install the throttle sensor body as follows:
— Clamp cable end using clamp and shims (refer to Figure 4–5).
— Secure the sensor body using the mounting holes provided.
— Install a heat shield if any part of the throttle sensor is near the exhaust
manifold, turbochargers, or any other heat source.
• Adjust the throttle sensor as follows:
— The engine fuel lever must be at the closed throttle position.
— Install the hitch pin cable end of the of the sensor to the engine fuel lever
with brackets so that at the idle position the cable end is 11–17 mm
(0.44–0.67 inch) from its fully retracted position, and at wide open throttle
the cable end is pulled 15–22.9 mm (0.60–0.90 inch) from the idle
position.
— Check the stroke distance of the throttle sensor, from closed to wide open.
Stroke distance must be from 15–22.9 mm (0.60–0.90 inch).
— Recheck for zero clearance at the fuel lever. Make sure that the
15–22.9 mm (0.60–0.90 inch) dimension has not changed.
— Design throttle sensor linkage brackets and levers to nominal dimensions so
that the system stays within tolerance bands throughout its operating life.
34
INSTALLING
TRANSMISSION
INTO VEHICLE
S ECTION
V
5–1. HANDLING
a. Preventing Damage. Carefully handle the transmission to prevent damage to
components in the installation path.
b. Control of Transmission Movements. Use a hoist or transmission jack that al-
lows precise control of transmission movements during installation.
5–2. MOUNTING TO ENGINE
Use the following procedure to mount the transmission to the engine:
•
•
•
•
•
•
• Align one of the flexplate’s bolt holes with the access opening at the
front of the engine flywheel housing.
Lubricate the center pilot boss with molybdenum disulfide grease (Molycote
G, or equivalent).
Install a headless guide bolt into one of the flex disk bolt holes in the flexplate
adapter (refer to Figure 4–3). Align the guide bolt with the flexplate hole at
the access opening.
Push the transmission toward the engine while guiding the pilot boss on the
flywheel into the flexplate hub (adapter), and the guide bolt into the hole on
the flexplate.
Seat the transmission squarely against the engine flywheel housing — no
force is required. If interference is encountered, move the transmission away
from the engine and investigate the cause.
Align the bolts holes in the converter housing with those in the engine
flywheel housing.
Install all transmission-to-engine bolts finger tight.
CAUTION: The entire converter housing circumference must be
flush against the engine flywheel housing before tightening any bolts.
DO NOT use the bolts to seat the housing.
35
• Tighten four bolts at 90 degree intervals around the converter housing bolt
circle. Use the torque specified by the engine or vehicle manufacturer —
usually M10 x 1.5-6H bolts tightened to 51–61 N·m (38–45 lb ft) or 7⁄16-14
bolts tightened to 73–88 N·m (54–65 lb ft).
• Remove the guide bolt through the engine flywheel housing access opening.
Replace it with a self-locking bolt. Tighten the bolt finger tight.
NOTE:
DO NOT tighten any flexplate-to-flexplate adapter bolts until all of the
bolts have been installed and tightened finger tight.
• Rotate the engine crankshaft to install the remaining self-locking bolts into
the flexplate adapter. After all bolts have been installed finger tight, tighten
them to 24–29 N·m (18–21 lb ft).
• Install the flywheel housing access cover.
5–3. INSTALLING TRANSMISSION MOUNTING COMPONENTS
CAUTION: Use the type and grade of mounting bolts recommended
by the vehicle manufacturer.
• Install all bolts, washers, spacer, isolators, or supports required to support the
transmission in the vehicle frame.
• Tighten the bolts to the torque values recommended by the vehicle
manufacturer.
5–4. COUPLING TO DRIVELINE
• Couple the driveline companion flange or universal joint yoke to the flange or
yoke on the transmission. Use the bolts and torque values recommended by
the vehicle manufacturer.
• Check the universal joint angularity of all U-joints in the driveline. Determine
if they are within specification.
5–5. CONNECTING POWER TAKEOFF CONTROLS
If not already mounted, mount the PTO(s) onto the transmission — refer to
Paragraph 3–3.
• Check the PTO harness routing for kinks and sharp bends. Avoid routing the
cable close to exhaust pipes or manifold. The PTO harness must not rub or
interfere with adjacent parts.
36
• Connect controls to the PTO.
• Check for proper PTO control operation.
CAUTION: PTO units using transmission main pressure to engage
the PTO gear must have a positive main pressure shut-off at the
solenoid valve when the PTO is not engaged.
• Couple the PTO output to its driven equipment. Check couplings or universal
joints for correct assembly and alignment.
5–6. CONNECTING COOLER
Figure 5–1 shows typical cooler line installation.
MD 3070PT
TO
COOLER
COOLER
RETURN
RIGHT VIEW
TORQUE ON COOLER FITTINGS 54–68 N•m (40–50 LB FT)
V01729
Figure 5–1. Torque Values of Typical Fluid Cooler Lines
5–7. CONNECTING SPEEDOMETER DRIVE
The ECU, through the VIM, provides an electronic speedometer speed signal.
If used, consult the OEM for connection procedure.
37
5–8.
CONNECTING ELECTRICAL COMPONENTS
NOTE:
Allison World Transmission electronic control systems are designed
and manufactured to comply with all FCC and other guidelines
regarding radio frequency interference/electromagnetic interference
(RFI/EMI) for transportation electronics. Manufacturers, assemblers,
and installers of radio-telephone or other two-way communication
radios have the sole responsibility to correctly install and integrate
those devices into Allison World Transmission-equipped vehicles to
customer satisfaction. For further information, refer to the Electronic
Controls Troubleshooting Manual, TS2470EN.
a. Procedure.
• Remove the cover from the transmission feedthrough connector and carefully
connect the transmission external wiring harness. Keep dirt and debris out of
the connector.
• Connect the external wiring harness.
— Connect the engine speed sensor and transfer case connector.
• Connect the PTO(s) connector(s). The PTO connector is NOT part of the
Allison Transmission external wiring harness.
• Tighten the transmission wiring harness external connector bolt to 2–3 N·m
(18–25 lb in.).
• Ensure the speed sensors, the PTO connector, and all other connectors are
securely seated and latched. A connector can be heard or felt to latch, but
confirm the latching by pulling on the connector — NOT THE WIRES.
• The transmission has a sump fluid temperature sensor on the internal harness.
Actual temperature readings can be made with the diagnostic tool.
• A temperature gauge may be installed in the “To Cooler” line. If equipped for
them, install a temperature probe — capillary tube and bulb or a
thermocouple.
If equipped with a capillary tube and bulb:
— Tighten the adapter tight enough to prevent leakage.
— Install the bulb into the adapter and tighten the nut.
— Check the capillary tube for interference with other parts that might chafe
or damage the tube. Long tubes may require support clips or brackets.
38
If equipped with a thermocouple:
— Install the thermocouple and connect the leads.
• Install and connect other electrical components such as — heaters,
winterization equipment, and pressure sensors.
• If equipped, install the pressure gauge tube or line.
• Check that all unused hydraulic openings are plugged.
5–9.
FILLING HYDRAULIC SYSTEM
• Select a transmission fluid — refer to Paragraph 1–5.
• Fill the transmission with the required amount of fluid — refer to Paragraph 1–8.
• Run the engine for about one minute and check the fluid level — refer to
Paragraph 1–3.
5–10. INSTALLATION CHECKLIST
Complete the Installation Checklist in Section VI.
39
S ECTION
VI
CHECKS AND
ADJUSTMENTS
6–1. INSTALLATION CHECKLIST
Use this list after transmission installation. As items are checked, mark
them off this list.
• Torque Values:
❑ All control module bolts — 51–61 N·m (38–44 lb ft)
❑ Breather — 12–16 N·m (9–12 lb ft)
❑ Control module pressure taps — 10–13 N·m (7–10 lb ft)
❑ Cooler fittings — #12, 34–47 N·m (25–35 lb ft)
#16, 54–68 N·m (40–50 lb ft)
#20, 68–81 N·m (50–60 lb ft)
❑ Cooler port cover bolts — 51–61 N·m (38–44 lb ft)
❑ Expansion plug — 1–2 N·m (9–18 lb in.)
❑ External harness-to-transmission connector bolt — 1–2 N·m
(9–18 lb in.)
❑ Flexplate adapter-to-converter cover bolts — 24–29 N·m (18–21 lb ft)
❑ Flexplate-to-crankshaft hub bolts — Consult Engine Manufacturer
Specifications
❑ Flexplate-to-flexplate adapter bolts —
12-bolt design — 24–29 N·m (18–21 lb ft)
6-bolt design — 51–61 N·m (38–44 lb ft)
❑
❑
❑
❑
❑
❑
❑
Fluid drain plug — 25–32 N·m (18–24 lb ft)
Fluid fill tube bracket — 24–29 N·m (18–21 lb ft)
Speed sensor bolts — 24–29 N·m (18–21 lb ft)
Output flange bolts — 30–35 N·m (22–26 lb ft)
PTO cover bolts — 51–61 N·m (38–44 lb ft)
PTO mounting bolts — 51–61 N·m (38–44 lb ft)
PTO pressure hose to transmission — 10–13 N·m (7–10 lb ft)
40
❑ Rear cover bolts — 90–110 N·m (66–81 lb ft)
❑ TPS to transmission bracket — 108–122 N·m (80–90 lb ft)
❑ Transmission electronic connector bolts — 5–7 N·m (48–62 lb in.)
• Cooler Fluid Lines and Air Hose for:
❑ No leaks
❑ Connection tightness
❑ Correct routing
• Throttle Sensor for:
❑ Proper adjustment
❑ Correct routing of cable and harness
• Driveline for:
❑ Proper indexing of universal joints
❑ Proper drive shaft angles
❑ Driveline backlash
❑ Lubricated universals and slip-joints
• Hydraulic System for:
❑ Recommended fluid — DEXRON®-III or C-4 fluid
❑
❑
❑
❑
❑
❑
Correct fluid level in transmission
Dipstick correctly calibrated — refer to Figure 1–1
Fill tube tight
Fill tube cap tight
Breather clean and free of restrictions
No fluid leaks during operation
• Instruments and Electrical Equipment for:
❑ Proper wiring and electrical connections
❑ Instruments, gauges, and lights work correctly
❑ Shift selector display is on and DO NOT SHIFT light is off
❑ Fluid temperature gauge
• Power Takeoff for:
❑ Controls connected and operative
❑ Correctly coupled to driven equipment
❑ Lubrication line correctly installed and routed — if used
41
6-2. ROAD TEST AND VEHICLE OPERATION CHECKLIST
NOTE:
Refer to MD 3070PT Transmission Operator’s Handbook for operating
instructions.
a. Driveability. Drive-away checks are performed to verify proper transmission and
support equipment installation and operation. The following steps outline driveaway check procedures:
• Check Fluid — fill the transmission with the appropriate fluid.
• Start the Vehicle — check for proper system response during start-up.
— Turn on the vehicle’s master/ignition switch.
— The DO NOT SHIFT light should come on.
— Start the engine.
— The DO NOT SHIFT light should go off.
— “N N” should appear on the shift selector display.
• Clear Trouble Codes — during installation, it’s common for “false” codes to
be stored in the electronic control’s ECU. These codes must be cleared prior
to road testing the vehicle.
• Road Test the Vehicle — allow the electronic control time to “converge”
shifts.
• Check for Proper Operation — check all components for proper mounting and
operation, and check for transmission fluid leaks at gasket surfaces, lines, and
hoses.
• Re-check for Trouble Codes — use the Pro-Link® or shift selector to
determine if codes were set during the road test.
• Troubleshoot— if codes exist after the road test, problems must be found and
corrected. Refer to WT Troubleshooting Manual TS2470EN.
b. Service and Maintenance. Refer to a current issue of the MD Series Service
Manual for detailed transmission service and maintenance instructions. Refer to a
current issue of the MD Series Troubleshooting Manual for detailed electronic control system troubleshooting. Refer to Section 7–2 for the latest publication number.
c. Road Test Checklist. Complete the following check list.
• Neutral Start Circuit:
❑ Starts only in neutral
42
• Instruments:
❑ DO NOT SHIFT light and shift selector display
❑
❑
❑
❑
Transmission fluid pressure gauge — if used
Speedometer
Temperature gauge — if used
Reverse warning system — if used
• Transmission Fluid:
❑ Fluid level meet specifications — cold, neutral, level
❑ No leaks
❑ Warm-up and check fluid level — hot, neutral, level
• No-Load Governed Engine Speed:
❑ No-load governed speed of engine
❑ Adjust governor as necessary — refer to the manufacturer’s specifications
for the engine-transmission being tested.
• PTO:
❑ PTO operation — refer to MD 3070PT Operator’s Manual or to the
vehicle manufacturer’s specific instructions.
• Shift Sequence:
❑ Transmission upshifts and downshifts smoothly through all ranges
• Other Checks:
❑ Stall test
❑ Shift quality
• Comments:
_________________________________________________________
_________________________________________________________
_________________________________________________________
_________________________________________________________
_________________________________________________________
43
S ECTION
VII
CUSTOMER SERVICE
7–1. OWNER ASSISTANCE
There are distributors and dealers around the world ready to stand behind every
Allison Transmission product. Any situation that arises in connection with the sale,
operation, or service of your transmission will be handled by the distributor or dealer
in your area.
Refer to the North American Parts and Service Directory SA2229 or the International
Parts and Service Directory SA2338 for a current listing of Allison Transmission
authorized distributors and service dealers.
7–2. SERVICE LITERATURE
This service literature provides fully illustrated instructions for operation,
maintenance, service, overhaul, and parts support for your transmission.
To ensure maximum performance and service life from your unit,
see your dealer or distributor for the following publications. Check the
telephone directory for the Allison Transmission service outlet nearest you.
Table 7–1.
MD 3070PT Service Literature
Publication Title
Publication
Number
Service Manual
SM2148EN
Parts Catalog
PC2150EN
Troubleshooting Manual
TS2470EN
Principles of Operation
PO2454EN
Operator’s Manual
OM2683EN
Job-Aid Card
JA2506EN
44
MT2923EN 199611
www.allisontransmission.com
Printed in USA 199611

advertisement

Was this manual useful for you? Yes No
Thank you for your participation!

* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project

Related manuals

Download PDF

advertisement