TM-9-2320-361-24-1 Field Maintenance Manual Volume 1 for M44A2 Series Trucks
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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.