Jacobs Exhaust Brake™
EX3116/3126,
EX3126B, And TM3126B
FOR APPLICATION ON 3116, 3126, AND 3126B CATERPILLAR® ENGINES
INSTALLATION
™
Information in this manual was current at the time of printing and is subject to change without notice or liability.
See the Jake Brake Product Reference Guide for Caterpillar Engines, Manual Form RENR 1370, and Jacobs
website - www.jakebrake.com - for more information.
Table of Contents
B.
Vehicles equipped with hydraulic brakes:
Vehicles that do not have an on-board air supply
require the installation of an auxiliary air supply
system. When an air supply is required, order the
Pneumatic Group with Air Supply and Electrical
harness Group. Follow the installation instructions
included with the Pneumatic Group with Air
Supply. See the Brake Application Guide for
correct part numbers.
C.
Vehicles with Allison Transmissions: For
vehicles equipped with an Allison transmission,
refer to Appendix A, Installing the Jacobs Exhaust
Brake with Allison Automatic Transmissions. For
information on the use of the exhaust brake on
these vehicles, see Jacobs Exhaust Brake™
Application Note 93-1, available in the Jake
Brake Product Reference Guide (see note at the
top of this page).
1.Exhaust Brake Assembly Installation ........ 3
A. Turbo-mount Applications ........................ 3
B. In-pipe Applications .................................. 4
2.Pneumatic Group Installation .................... 6
3.Controls Installation
A. 3116 Mechanical Engines ........................ 8
B. 3126B Electronic Engines ....................... 10
C. 3126 Electronic Engines ........................ 11
4. Final Test ................................................. 12
Appendix A
Installing the Jacobs Exhaust Brake with
Allison Automatic Transmissions ........... 13
Application Notes
A.
Engine application:
For Caterpillar 3126B engines there are two
aftermarket kits available: a turbo-mount design
and a standard "in-pipe" design. The turbomount design eliminates cutting and welding of
exhaust pipes, simplifying installation. The
exhaust brake housing, however, extends
approximately 3" from the turbo outlet. Before
installing this type of exhaust brake, ensure there
will be at least 3" of clearance between any
exhaust component and the vehicle chassis and
firewall after exhaust brake installation.
For Caterpillar 3116 and 3126 engines, a
standard "in-pipe" kit is available.
For kit part numbers and further information, see
the Brake Application Guide in the Jake Brake
Product Reference Guide for Caterpillar Engines,
Manual Form RENR 1370.
Installation is approved for all 3126 and 3126B
engines. Installation on 3116 engines is limited to
engines with S/N 2BK29931 and higher (all
horsepower ratings) and 200 - 275 horsepower
ratings built after August, 1992. Some earlier
3116 engines can be converted for higher back
pressure. See Jacobs Product Advisory 94-2 for
details (included in the Form RENR 1370).
2
Safety Precautions
The following symbols in this manual signal potentially
dangerous conditions to the mechanic or equipment.
Read this manual carefully. Know when these
conditions can exist. Then, take necessary steps to
protect personnel as well as equipment.
THIS SYMBOL WARNS OF
POSSIBLE PERSONAL INJURY.
THIS SYMBOL REFERS TO
POSSIBLE EQUIPMENT DAMAGE.
NOTE:
INDICATES AN OPERATION, PROCEDURE
OR INSTRUCTION THAT IS IMPORTANT
FOR CORRECT SERVICE.
Fuels, electrical equipment, exhaust gases and
moving engine parts present potential hazards that
could result in personal injury. Take care when
installing a compression brake. Always use correct
tools and proper procedures as outlined in this
manual.
THE JACOBS EXHAUST BRAKE™
COMPRESSION BRAKE IS A
VEHICLE SLOWING DEVICE, NOT A
VEHICLE STOPPING DEVICE. IT IS NOT A
SUBSTITUTE FOR THE SERVICE BRAKING
SYSTEM. THE VEHICLE’S SERVICE BRAKES
MUST BE USED TO BRING THE VEHICLE TO A
COMPLETE STOP.
JACOBS EXHAUST BRAKE™ EX3116/3126, EX3126B, AND TM3126B INSTALLATION MANUAL
Section 1: Exhaust Brake Assembly Installation
For turbo-mount models, follow the procedure in 1A. For in-line models, follow the
procedure in 1B.
1A.
Turbo-mount Installation
Refer to Figure 1 for the following procedures.
1. Loosen the “V” clamp holding the original
exhaust pipe to the turbo. Remove the exhaust
pipe. Inspect the exhaust pipe for any sign of
rust or damage. Replace if necessary.
2. In most installations, the exhaust pipe must be
shortened to allow installation of the exhaust
brake housing. The most convenient method is
to modify the exhaust pipe length at a slip joint.
Using a torch, heat the pipe sufficiently to
disassemble the slip joint. Then remove the
required length of exhaust pipe.
3. The exhaust brake assembly is mounted to the
turbo outlet using the gasket and clamp
provided (see Figure 1). The gasket is coated
with an adhesive to ease installation. Remove
the backing from the adhesive and apply the
gasket to the turbo outlet, taking care to center
the gasket.
NOTE:
ENSURE THE GASKET IS CENTERED
DURING INSTALLATION OF THE EXHAUST
BRAKE. GASKETS NOT CENTERED
CORRECTLY DURING INSTALLATION CAN
CAUSE UNNECESSARY RESTRICTION OF
EXHAUST FLOW AND POSSIBLE LOSS OF
POSITIVE POWER, OR A LEAK DURING
BRAKING AND LOSS OF BRAKING POWER.
4. Position the exhaust brake assembly so the air
cylinder is either above the exhaust brake
housing or on the side of the housing opposite
the engine, and mount to the turbo using the
clamp provided.
FIG. 1
6. Connect the original exhaust pipe to the
exhaust brake housing. Use the clamp
provided in the kit. No gasket is required
between the exhaust brake assembly and the
exhaust pipe. Tighten the clamp enough to
loosely hold the parts in place.
7. Make the connection to the muffler using the
parts (flex pipe and clamp) removed when the
installation began. With the clamps still loose,
align the exhaust system. Ensure that there is
proper clearance between the exhaust system,
including the exhaust brake components, and
the engine and chassis. Now torque all the “V”
clamps to 70 - 80 lb-in. (8 - 9␣ N•m).
Proceed to Section 2, Pneumatic Group
Installation.
TO PREVENT EXPOSURE TO
EXCESSIVE HEAT, DO NOT
INSTALL THE EXHAUST BRAKE
ASSEMBLY WITH THE AIR CYLINDER FACING
THE ENGINE SIDE OF THE HOUSING. TO
PREVENT ACCUMULATION OF WATER IN THE
SOCKET JOINT, DO NOT INSTALL THE EXHAUST
BRAKE ASSEMBLY WITH THE AIR CYLINDER
LOCATED BENEATH THE MAIN HOUSING.
5. When the exhaust brake assembly is properly
positioned, torque the clamp bolts to 70 - 80
lb-in. (8 - 9␣ N•m).
JACOBS EXHAUST BRAKE™ EX3116/3126, EX3126B, AND TM3126B INSTALLATION MANUAL
3
ORIGINAL
EQUIPMENT
WELD
ORIGINAL
EQUIPMENT
HORIZONTAL
ORIENTATION
(OPTIONAL)
VERTICAL
ORIENTATION
(PREFERRED)
FIG. 3
FIG. 2
1B.
In-pipe Installation
Important Notes on the Positioning of
the Jacobs Exhaust Brake™
A. Exhaust pipe arrangements vary from vehicle to
vehicle. Install the exhaust brake no further than
48” (122 cm) from the turbocharger.
NOTE:
NOTE:
INSTALLING THE EXHAUST BRAKE
ASSEMBLY DOWNSTREAM FROM A FLEX
PIPE OR NON-SEALED JOINT, OR
INSTALLING THE ASSEMBLY FURTHER
THAN 48" FROM THE TURBOCHARGER
WILL RESULT IN POOR BRAKING
PERFORMANCE.
B. Mount the exhaust brake in a vertical orientation
with the exhaust brake air cylinder facing the
front of the vehicle (refer to Fig. 2). This will
ensure a flow of air over the cylinder.
C. When vertical orientation is not possible, the
exhaust brake can be mounted in the horizontal
position. Position the exhaust brake with the air
actuator facing the side of the exhaust pipe but
away from the engine(refer to Fig. 2).
DO NOT POSITION THE EXHAUST BRAKE SO
THAT THE ACTUATOR IS ABOVE OR BELOW
THE EXHAUST PIPE.
Installing the exhaust brake assembly
1. Figure 1 indicates a typical arrangement of the
exhaust brake and mounting hardware. Loosen
the “V” clamps holding the original exhaust pipe
arrangement in place. Remove the exhaust
pipe, inspect for any sign of rust or damage.
Replace if necessary.
2. Lay the exhaust pipe on the ground or bench
4
with the exhaust brake and exhaust pipe
sleeves, (see Fig.␣ 2) and mark the pipe section
to be replaced with the sleeves. Cut out the
necessary pipe section and weld the sleeve to
the two exhaust pipe lengths.
BE SURE TO CUT THE PIPE STRAIGHT AND
WELD THE SLEEVES IN PLACE CAREFULLY
TO ENSURE THAT NO LEAKS OCCUR IN
THE SYSTEM. THE SECTION OF THE
EXHAUST PIPE BETWEEN THE TURBO AND
THE EXHAUST BRAKE ASSEMBLY WILL BE
UNDER SIGNIFICANT INTERNAL
PRESSURE, AND ANY LEAKS WILL
SERIOUSLY AFFECT RETARDING
PERFORMANCE.
3. Reinstall the exhaust pipe on the turbocharger
using Jacobs gasket. The gasket is coated with
an adhesive to ease installation. Remove the
backing from the adhesive and apply the gasket
to the turbo outlet, taking care to center the
gasket.
NOTE:
ENSURE THE GASKET IS CENTERED
DURING INSTALLATION OF THE EXHAUST
BRAKE. GASKETS NOT CENTERED
CORRECTLY DURING INSTALLATION CAN
CAUSE UNNECESSARY RESTRICTION OF
EXHAUST FLOW AND POSSIBLE LOSS OF
POSITIVE POWER, OR A LEAK DURING
BRAKING AND LOSS OF BRAKING POWER.
4. Install the exhaust brake assembly at the other
end of the section of pipe just installed using
the gasket and the “V” clamp. Orient the
exhaust brake assembly so the air cylinder
bracket points away from the turbocharger.
Make sure that the gasket is centered on the
exhaust brake inlet. Install the “V” clamp and
tighten enough to temporarily hold the parts in
place.
JACOBS EXHAUST BRAKE™ EX3116/3126, EX3126B, AND TM3126B INSTALLATION MANUAL
5. Install the second section of exhaust pipe with
the sleeve attached and clamp to the exhaust
brake outlet using the “V” clamp provided. No
gasket is needed between the exhaust brake
and this pipe section.
6. Make the connection to the muffler using the
parts (flex pipe and clamp) removed when the
installation began. At this point, with the
clamps still loose, align the exhaust system.
Ensure that there is proper clearance between
the exhaust system (including the exhaust
brake components) and the engine and
chassis. Torque all the “V” clamps to 70 - 80
lb.-in. (8 - 9␣ N•m).
7. One support boss is cast into the exhaust
brake housing to facilitate the attachment of a
support bracket. This support bracket is then
fastened to a suitable engine, bell housing or
transmission mounting point. The actual
configuration of this support bracket and
fasteners depends on the specific vehicle
configuration. Failure to support the exhaust
brake and exhaust system properly can cause
damage to the exhaust system.
NOTE:
MAKE SURE THAT THE GASKETS ARE
INSTALLED BETWEEN THE TURBO
OUTPUT AND THE EXHAUST PIPE AND
BETWEEN THE EXHAUST PIPE AND THE
EXHAUST BRAKE INLET. FAILURE TO
CORRECTLY INSTALL THESE GASKETS
CORRECTLY WILL RESULT IN A
SIGNIFICANT LOSS OF RETARDING
PERFORMANCE.
JACOBS EXHAUST BRAKE™ EX3116/3126, EX3126B, AND TM3126B INSTALLATION MANUAL
5
Section 2: Pneumatic Group Installation
Refer to Figure 4 when installing the pneumatic group.
14
Exhaust Brake
Assembly
13
11
8
9
12
10
11
7
1
6
5
2
4
3
To Vehicle Air Tank
FIG. 4
Ill.
Ill.
No.
1
2
3
4
5
6
7
6
Description
Pipe tee, 1/2 NPT
Reducer bushing, 1/2 - 1/4 NPT
90° street elbow, 1/4 NPT
Nipple, 1/4 NPT
Protection valve
Compression fitting assembly
Air brake tube
No.
8
9
10
11
12
13
14
Description
Compression fitting assembly
Solenoid valve
45° flared, 90° elbow, 1/8 NPT
Hose fitting assemblies (2)
Air brake hose
45° flared, 90° elbow, 1/4 NPT
Nipple, 1/4 NPT
JACOBS EXHAUST BRAKE™ EX3116/3126, EX3126B, AND TM3126B INSTALLATION MANUAL
BLEED THE AIR TANK OF THE
VEHICLE BEFORE STARTING THIS
INSTALLATION.
1. Install the protection valve at the outlet of the
vehicle's existing air tank using the proper pipe
fittings as indicated in Figure 3.
USE OF THE PROTECTION VALVE
WILL MAINTAIN THE INTEGRITY OF
THE ORIGINAL PNEUMATIC
SYSTEM. UNDER NO CIRCUMSTANCES
SHOULD THE PROTECTION VALVE BE OMITTED
FROM THE INSTALLATION OF THE EXHAUST
BRAKE.
NOTE:
IF A FITTING IS NOT AVAILABLE ON THE
AIR TANK AND A “TEE” FITTING IS
EMPLOYED TO TAP INTO THE ORIGINAL
PNEUMATIC CONNECTIONS, ENSURE
THAT THE ORIGINAL AIR CONNECTIONS
ARE CORRECTLY RETORQUED.
2. Install the solenoid valve on the chassis rail
using existing predrilled holes. If no suitable
location is available on the chassis rail, then
mount the solenoid valve to the body sheet
metal. Position the solenoid valve with its air
exhaust port facing downward. Avoid excessive
heat coming from the exhaust system. The
distance from the solenoid valve to the air
cylinder of the exhaust brake should be within
the length of the supplied air hose.
3. Using the 1/4 - 18 NPT compression fittings,
connect the solenoid port marked “1” or “P” to
the air tank using the air tubing. When
assembling compression fittings, cut the tubing
ends squarely, then insert the tubing into the
fitting until it bottoms on the seat. Tighten the
nut until one thread remains visible on the
fitting.
2” (51 mm). Install the end fittings on both ends
of the hose according to the following steps:
a. Cut the hose squarely with a fine tooth
hacksaw or cutoff wheel.
b. Put the socket in a vise.
c. Screw the hose counterclockwise into
socket until it bottoms, then back off 1/4
turn.
d. Lubricate the nipple thread and inside of the
hose liberally with a heavy oil or Aeroquip
hose assembly lube, Aeroquip P/N 222070.
e. Screw the nipple clockwise into socket and
hose. Leave 1/32” (0.8 mm) to 1/16” (1.6
mm) clearance between the nipple hex and
socket.
5. Route the air tubing carefully and clamp using
the clamps provided. Avoid tight bends,
excessive heat coming from the exhaust
system (+200° F/93° C) and ensure there is no
possibility of abrasion through contact with
chassis components.
6. If there is a plug in the exhaust port of the
solenoid valve, remove it. Use the hose
assembly to connect the solenoid port marked
“2” or “A” to the exhaust brake air cylinder.
4. The supplied air hose, connects the solenoid
port marked “2” or “A” to the exhaust brake air
cylinder. Shorten the hose to the required
length. Ensure that the minimum bend radius is
JACOBS EXHAUST BRAKE™ EX3116/3126, EX3126B, AND TM3126B INSTALLATION MANUAL
7
Section 3: Installation of the Controls
3.A. 3116 Mechanical Engines
Dash and Clutch Switches
1. Install the dash switch in a convenient location
on the dashboard.
2. Install the clutch switch using the instructions
included in the Clutch switch group.
Fuel Pump Switch Installation
1. Remove the two throttle return springs, throttle
lever, bolt and washers. Note there is one
washer on top and one below the throttle lever.
2. Remove the three bolts that attach the throttle
linkage bracket to the engine. Using the
template supplied in the kit, mark and drill the
bracket with a “V” size (0.377”) or an M10 drill
bit (see Fig. 4).
FIG. 5
4. Install the provided switch in the switch bracket
as shown. Orient the switch bracket so that the
switch contact face is perpendicular to the
switch axis (see Fig. 6). Once this adjustment
has been made, torque the throttle lever bolt to
15 - 25 lb.-ft. (21 - 35 N•m). Reinstall the
throttle linkage springs.
FIG. 4
3. Reinstall the throttle linkage bracket. Torque
the two M10 bolts to 33 - 47 lb.-ft. (45 - 65
N•m) and the M8 bolt to 15 - 25 lb.-ft. (21 - 35
N•m). Discard the throttle lever bottom washer
and replace with the bracket included in the kit.
Reinstall the throttle lever along with the upper
washer (see Fig. 5). Do not torque the throttle
lever bolt at this time.
8
FIG. 6
JACOBS EXHAUST BRAKE™ EX3116/3126, EX3126B, AND TM3126B INSTALLATION MANUAL
5. Adjust the position of the switch so that the
switch plunger is depressed when the throttle
lever is at its low idle position. At the proper
adjustment, there should be a 0.010 - 0.015”
(0.254 - 0.381 mm) gap as shown in Fig. 7. In
this position, the throttle lever must be stopped
against the idle speed stop bolt.
6. Hold the switch in position and torque the
locknuts to 5 lb.-ft. (7 N•m).
NOTE:
ADJUST (IF NECESSARY) THE LOW IDLE
RPM ACCORDING TO THE ENGINE SHOP
MANUAL. NOTE THAT EVERY IDLE SPEED
ADJUSTMENT WILL REQUIRE A FUEL
PUMP SWITCH POSITION ADJUSTMENT.
Wire Harness Installation
Use the harness group supplied and make the
connections shown in the wiring diagram in Fig. 8.
BRACKET
SWITCH
0.010 - 0.015”
FIG. 7
Wiring Diagram, 3116 Engines
FUEL PUMP SWITCH
green
blue
yellow
red
Clutch switch
10A fuse or engine
circuit breaker
(required for
installation - not
included)
Key-switched
power
017594 power lead
NOTE: Connect all
grounds to a
common bolt or a
good chassis
ground.
Dashboard switch
Exha
u
Brakest
018899
wire harness
blue
red
black
white
green
BA
yellow
Exhaust Brake
FIG. 8
JACOBS EXHAUST BRAKE™ EX3116/3126, EX3126B, AND TM3126B INSTALLATION MANUAL
9
3.B. 3126B Electronic Engines
1. Install the dash switch in a convenient location
in the dashboard.
NOTE:
4. Connect the brown wire to Pin 12 on the
Engine Control Module (ECM) P1 connector
(see Fig. 9).
THE SWITCH GROUP USES LOWRESISTANCE GOLD-PLATED CONTACTS
AS REQUIRED BY THE ENGINE CONTROL
MODULE. ANY SUBSTITUTE SWITCH MUST
HAVE GOLD-PLATED CONTACTS.
5. Plug the connector on the Solenoid harness to
the corresponding connector on the Solenoid.
6. Connect the gray wire on the Solenoid harness
to the dash switch as shown in Figure 9.
Connect the green wire on the Solenoid
harness to a good chassis ground.
2. Connect the green and gray wires on the Relay
harness to the back of the switch as indicated
in Figure 9.
3. Connect the pink/white wire to keyed ignition.
Wiring Diagram, 3126B Engines
2-position
ON/OFF switch
Exha
u
Brakest
green
12V Relay base
Pin 86
Back side of switch
module
silver
contacts
Pin 87
Pin 30
gold
contacts
Pin 85
gray
green
A B
10A fuse or engine
circuit breaker
(required for
installation - not
included)
green
brown
pink/white
gray
Key-switched
power
Engine
ECM
To PIN 12 of ECM
Connector P1
P2
P1
Exhaust
brake
solenoid
FIG. 9
10
JACOBS EXHAUST BRAKE™ EX3116/3126, EX3126B, AND TM3126B INSTALLATION MANUAL
3.C. 3126 Electronic Engines
1. Install the dash switch in a convenient location
in the dashboard.
NOTE:
4. Connect the brown wire to Pin 40 on the
Engine Control Module (ECM) P1 connector
(see Fig. 10).
THE SWITCH GROUP USES LOWRESISTANCE GOLD-PLATED CONTACTS
AS REQUIRED BY THE ENGINE CONTROL
MODULE. ANY SUBSTITUTE SWITCH MUST
HAVE GOLD-PLATED CONTACTS.
5. Plug the connector on the Solenoid harness to
the corresponding connector on the Solenoid.
6. Connect the gray wire on the Solenoid harness
to the dash switch as shown in Figure 10.
Connect the green wire on the Solenoid
harness to a good chassis ground.
2. Connect the green and gray wires on the Relay
harness to the back of the switch as indicated
in Figure 10.
3. Connect the pink/white wire to keyed ignition.
Wiring Diagram, 3126 Engines
Exha
u
Brakest
2-position
ON/OFF switch
green
12V Relay base
NOTE: Connect all
grounds to a
common bolt or a
good chassis ground.
Pin 86
(Back side of switch
module)
Pin 30
gray
pink/white
Pin 87
silver
contacts
gold
contacts
Pin 85
gray
green
A B
brown
green
10A fuse or engine
circuit breaker
(required for
installation - not
included)
Caterpillar
harness
P2
ENGINE
E.C.M.
OEM
harness
Exhaust
brake
solenoid
P1
Key-switched
power
IGNITION
To PIN 40 of ECM
Connector P1
FIG. 10
JACOBS EXHAUST BRAKE™ EX3116/3126, EX3126B, AND TM3126B INSTALLATION MANUAL
11
Final Test
1. Start the engine and run at low idle speed with
the transmission in neutral and the parking
brake set.
2. Turn on the dash switch. The exhaust brake
should come on within 0.25 seconds. Step on
the accelerator pedal and increase engine
speed. The exhaust brake must turn off at
900␣ ± 50 RPM. Take your foot off the pedal
and the exhaust brake should turn on again
within 0.25 seconds.
3. With the engine at idle, step on the clutch
pedal. Again, the exhaust brake must turn off
immediately. Take your foot off the clutch pedal
and the exhaust brake should turn on again.
NOTE:
ON ELECTRONIC ENGINES, THE EXHAUST
BRAKE WILL ONLY OPERATE ABOVE 900
RPM WHEN DECELERATING.
4. Check for exhaust gas leakage around the “V”
clamps at the turbo outlet and exhaust brake
inlet. No leakage is allowed as this will reduce
the effectiveness of retarding performance.
5. Before returning the vehicle to service, make a
final check of wiring and air tubing/hose routing
to make sure that it does not run against hot
surfaces or is abraded or kinked. Take the
vehicle out for a road test to ensure that the
system is functioning correctly.
NOTE:
12
UNDER NORMAL OPERATING
CONDITIONS, DO NOT USE THE EXHAUST
BRAKE AT IDLE ENGINE SPEED.
JACOBS EXHAUST BRAKE™ EX3116/3126, EX3126B, AND TM3126B INSTALLATION MANUAL
Appendix A - Installing the Jacobs Exhaust Brake™ on
vehicles equipped with Allison Automatic Transmissions
When installing the Jacobs Exhaust Brake™ on vehicles equipped with Allison Automatic transmissions, some
modification of the wiring provided in the kit may be required. For specific information by model, refer to the
procedures below.
For additional information on the use of the Jacobs Exhaust Brake with automatic transmissions, see Application
Notes 93-1 (P/N 021163).
Allison AT and MT Series Transmissions
When installing the Jacobs Exhaust Brake Model 3116 on vehicles equipped with the Allison AT or MT
transmissions, follow the installation instructions included in this manual with the following exception: splice
together the two wires connected to the clutch switch. Refer to the wiring diagram on page 9 for wire
identification.
When installing Models 3126 or 3126B on vehicles equipped with Allison AT or MT transmissions, no
Modifications to the installation are required.
Allison MD Series ("World") Transmissions
Use of the Jacobs Exhaust Brake on Allison MD Series transmissions requires special programming of the Allison
Transmission. Refer to Application Notes 93-1 for more information. Application Notes 93-1 is available in the
Jake Brake® Product Reference Guide for Caterpillar Engines, Manual Form RENR 1370, or from Jaoobs website
(www.jakebrake.com).
Wiring of the exhaust brake with the Allison MD transmission requires interfacing with the Allison transmission
controls. Modification of the wiring harness included in the kit must be made by the installer. Refer to the wiring
diagrams below and on the next two pages when wiring the exhaust brake.
Wiring Diagram: Model EX3116 with the Allison World Transmission
NOTE: Connect all
grounds to a
common bolt or a
good chassis
ground.
10A fuse or engine
circuit breaker
(required for
installation - not
included)
green
blue
yellow
red
Pin 87A
Pin 85
018899
wire harness
To Allison ECU
installer
Pin 132
relay
(not
Pin 86
included)
Key-switched
power
017594 power lead
FUEL PUMP SWITCH
Dashboard switch
Exhau
Brakest
Pin 30
blue
red
Alternative installation
for vehicles equipped
with the Allison Vehicle
Interface Module (VIM)
green
To Pin 119 of
Allison ECU
Allison
VIM
Pin E2
BA
yellow
Pin D2
Exhaust Brake
JACOBS EXHAUST BRAKE™ EX3116/3126, EX3126B, AND TM3126B INSTALLATION MANUAL
13
Wiring Diagram: Model EX3126B with the Allison World Transmission
green
12V Relay base
Exha
us
Brake t
Pin 86
Pin 30
gray
pink/white
Pin 87
Pin 85
(Back side of switch
module)
To Allison ECM
wire 119
silver
contacts
gold
contacts
green
A B
To Allison ECU
installer
Pin 132
Pin 85
relay
(not
Pin 86
included)
Alternative installation
for vehicles equipped
Pin 30
with the Allison Vehicle
Interface Module (VIM)
14
2-position
ON/OFF switch
green
brown
Pin 87A
10A fuse or engine
circuit breaker
(required for
installation - not
included)
Flyback
diode
(prewired to
relay base)
NOTE: Connect all
grounds to a
common bolt or a
good chassis
ground.
gray
To PIN 12 of ECM
Connector P1
Pin D2
Key-switched
power
Allison
VIM
Pin E2
P2
Engine
ECM
P1
Exhaust
brake
solenoid
JACOBS EXHAUST BRAKE™ EX3116/3126, EX3126B, AND TM3126B INSTALLATION MANUAL
Wiring Diagram: Model EX3126 with the Allison World Transmission
green
12V Relay base
Exha
us
Brake t
Pin 86
Pin 30
gray
Flyback
diode
(prewired to
relay base)
(Back side of switch
module)
pink/white
Pin 87
Pin 85
To Allison ECM
wire 119
silver
contacts
gold
contacts
green
brown
Pin 87A
2-position
ON/OFF switch
NOTE: Connect all
grounds to a
common bolt or a
good chassis
ground.
green
A B
To Allison ECU
installer
Pin 132
Pin 85
relay
(not
Pin 86
included)
Alternative installation
for vehicles equipped
Pin 30
with the Allison Vehicle
Interface Module (VIM)
gray
To PIN 40 of ECM
Connector P1
Caterpillar
harness
P2
10A fuse or engine
circuit breaker
(required for
installation - not
included)
Pin D2
Key-switched
power
Allison
VIM
Pin E2
ENGINE
E.C.M.
P1
Exhaust
brake
solenoid
OEM
harness
JACOBS EXHAUST BRAKE™ EX3116/3126, EX3126B, AND TM3126B INSTALLATION MANUAL
15
™
Jacobs Vehicle Systems
22 East Dudley Town Road
Bloomfield, CT 06002
P/N 019747F
©2000 Jacobs Vehicle Systems, Inc.
Printed in U.S.A.
Visit us on the Internet:
www.jakebrake.com
Rev. 01/00
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