Section 07: TRANSMISSION
PA1553
13
3. Loose, dirty, or improperly adjusted throttle
sensor linkage;
4. Damaged or loose oil lines;
5. Worn or frayed electrical harnesses, improper
routing;
6. Worn or out of phase drive line U-joint and slip
fittings.
CAUTION
DO NOT pressure wash the transmission
electrical connectors. Water and detergent will
cause the contacts to corrode or become faulty.
7.1 BREATHER
The breather is located on the engine, flywheel
side near the valve cover. It serves to prevent
pressure build-up within the transmission and
must be cleaned to keep the passage opened.
The prevalence of dust and dirt will determine the
frequency at which the breather requires
cleaning. Use care when cleaning the engine.
Spraying steam, water or cleaning solution
directly at the breather can force the water or
solution into the transmission. Always use care
when removing the hose connector from
transmission to prevent the entry of foreign
matter.
8. ALLISON TRANSMISSION INSTALLATION
NOTE
For more clearance between the tag axle and
transmission, the tag axle may be unloaded
and jacked up, or retracted (if applicable).
1. With the access plug removed, align one of
the 12 attaching screw holes in the flexible
plate with the access opening (starter side).
2. Place the transmission on a transmission
jack.
3. Install a headless guide bolt into one of the 12
threaded holes for flexible plate attaching
screws in the flywheel.
4. Lubricate the flywheel center pilot boss with
molybdenum disulfide grease (Molycote G, or
equivalent).
5. Raise transmission and position the flywheel
pilot boss into the flexible plate adapter. Align
the guide bolt previously installed in the
flywheel with the flexible plate hole facing the
access opening in the flywheel housing.
DANGER
Severe damages and/or personal injury can
occur if transmission is not adequately
supported.
6. Seat the transmission against the engine
flywheel housing. NO FORCE IS
REQUIRED. If interference is encountered,
move the transmission away from engine,
then investigate the cause.
CAUTION
The torque converter housing must be seated
against the flywheel housing prior to tightening
any screws. DO NOT USE SCREWS TO SEAT
THE HOUSING.
7. Start all torque converter housing screws,
and then tighten four of them gradually and in
a criss-cross sequence around the housing.
Tighten the 12 remaining screws.
Recommended torque is between 42-50 lbf-ft
(57-68 Nm).
8. Remove the guide bolt through the access
opening in the flywheel housing. Replace it
with a self-locking screw, finger-tighten then
start the remaining screws; tighten to 17-21
lbf-ft (23-28 Nm). Place a wrench on the
crankshaft pulley attaching screw to turn the
converter to gain access to the threaded
holes.
9. Reinstall the access plug.
10. Remove jack from under transmission.
11. Connect all sensors.
12. Connect the main wiring harness.
13. Connect the air supply line (steel-braided
hose) to the retarder control valve (if
applicable).
14. Connect the two transmission oil cooler
hoses as they were previously.
15. Reinstall clamps and brackets, and replace
locking ties previously removed during
removal procedure.
16. Install propeller shaft and its safety guard.
Refer to Section 09, "PROPELLER SHAFT".
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