Cleaning And Inspection Of Allison Automatic Transmission; Breather; Allison Transmission Oil Cooler Removal; Transmission Without Retarder - PREVOST H3-41 Maintenance Manual

SECTION 07: TRANSMISSION
Using the oil level dipstick filler tube, refill with 24
US qts (23 liters), 28 US qts (26.5 liters) if
equipped with retarder, and check the oil level
Fluid
using the
Pushbutton Shift Selector procedure in this
section. Add transmission fluid according to
pushbutton shit selector fluid level check.
3.7 CLEANING AND INSPECTION OF
ALLISON AUTOMATIC TRANSMISSION
The exterior of the transmission should be
cleaned and inspected at regular intervals. The
length of service and severity of operating
conditions will determine the frequency of such
inspections. Inspect the transmission for:
1. Loosen bolts (transmission and mounting
components);
2. Oil leaks (correct immediately);
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.

3.7.1 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.
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PA1621 Maintenance Manual All Series | January 2017
Level Check Using
4. ALLISON TRANSMISSION OIL COOLER
REMOVAL
4.1

TRANSMISSION WITHOUT RETARDER

Stop engine and allow engine to cool. Close both
heater line shutoff valves (refer to Section 05
''Cooling'').
To drain the cooling system, proceed as per
Section 05 ''Cooling'', paragraph 5: Draining. If
the cooling system is contaminated, flush system
as per Section 05 ''Cooling'', paragraph 7:
Flushing.
1. Remove the rear L.H. side tag axle wheel,
then remove the rear L.H. side fender panel.
2. Disconnect the two transmission hoses from
oil cooler. Cover hose ends and fittings to
prevent fluid contamination (Figure 8).
WARNING
A significant amount of oil may drain from oil
lines when they are disconnected.
3. Unfasten the constant-torque hose clamps
and remove the two hoses.
4. Unscrew the four holding nuts and remove
the U-bolts, remove the oil cooler from engine
compartment.
5. Reinstall transmission oil cooler by using
reverse procedure.
4.2

TRANSMISSION WITH RETARDER

Stop engine and allow engine to cool. Close both
heater line shutoff valves (refer to Section 05
''Cooling'').
1. To drain the cooling system, proceed as per
Section 05 ''Cooling'', paragraph 5: Draining.
If the cooling system is contaminated, flush
system as per
paragraph 7: Flushing.
2. Remove the rear L.H. side tag axle wheel,
then remove the rear L.H. side fender panel.
3. Disconnect the transmission hoses from oil
cooler. Cover hose ends and fittings to
prevent fluid contamination.
Section 05
''Cooling'',