TM-9-2320-361-24-1
2-1/2 TON, 6X6, M44A2 SERIES TRUCKS
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE PART 1 OF 2
AUGUST 2006
TM-9-2320-361-24-1 - Page 149 of 1176
TM 9-2320-361-24-1
0008 00
0008 00-21
MECHANICAL SYSTEMS TROUBLESHOOTING - DIRECT SUPPORT (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. TRANSFER CASE
WILL NOT OPERATE
FRONT DIFFERENTIAL
1. Check sprag air cylinder operation
(TM 9-2520-246-34-1) and test
using outside air source with
engine stopped.
2. With air tanks full and engine off,
loosen airlines at sprag air
cylinder and listen for sprag
clutch engagement in transfer
sprag unit.
If sprag air cylinder operation is
defective, replace sprag cylinder
(WP 0136 00).
1. If forward and reverse sprag
engagements are not heard,
replace transfer sprag air cylinder
(WP 0136 00).
2. If sprag engagement is heard,
repair sprag unit in transfer case
(WP 0451 00).
2. TRANSFER CASE
WILL NOT OPERATE
REAR DIFFERENTIAL
1. Confirm transmission to transfer
propeller shaft turns.
2. Place transmission to transfer
propeller shaft in neutral. Try to
turn propeller shaft. If propeller
shaft moves, then it is damaged.
3. Confirm transfer to forward rear
axle propeller shaft can be turned.
Place transfer shifter into neutral
and raise both rear wheels on one
side of vehicle.
If transmission to transfer propeller
shaft will not turn with transmission
and transfer assembly in neutral.
Repair or replace transfer case
(WP 0451 00 or WP 0138 00)
Remove and repair propeller shaft
(WP 0139 00).
If rear axle propeller shaft will not
turn, see WP 0006 00, table 11,
malfunction 1, step 5. If propeller
and axles turn freely, replace
transfer case
(WP 0138 00).
3. TRANSFER CASE
LEAKS OIL
Check and verify approximate
location of oil leak(s).
1. If transfer case front output shaft
cover gasket is leaking, remove
transfer case (WP 0138 00) and
replace gasket (WP 0451 00).
2. If transfer case housing gasket is
leaking, remove transfer case
(WP 0138 00) and replace gasket
(WP 0451 00).
3. If transfer case input flange oil
seal is leaking, replace seal
(WP 0451 00).
4. If transfer case front output flange
oil seal is leaking, replace seal
(WP 0451 00).
5. If transfer case input shaft
bearing cover gasket is leaking,
replace gasket
Table 6. Transfer Case Troubleshooting Procedures.
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