TM 9-2320-273-20
Table 7-1. Power Transfer Case Troubleshooting Procedures.
MALFUNCTION.
TEST OR INSPECTION.
CORRECTIVE ACTION.
1.
2.
3.
4.
POWER TRANSFER CASE DOES NOT TURN FRONT AXLE PROPELLER SHAFT:
Disconnect control air supply line at power transfer case air chamber and check for air
supply with differential lockup control valve switch in LOCK position.
a.
Replace defective control valve (para 9-44).
b.
Troubleshoot truck compressed air system (para 9-5).
c.
If air control system is good, refer problem to Direct Support
Maintenance.
EXCESSIVE HEAT BUILDUP:
Step 1.
Check oil level in both the main case and the clutch housing for proper level.
Fill to proper level (para 7-8).
Step 2.
Check oil cooler system for proper functioning.
Tighten fittings, clean cooling fins, replace pump (para 7-9).
LUBRICANT LEAKING:
Step 1.
Check drain plugs for tightness.
Tighten drain plugs.
Step 2.
Check for clogged or damaged breathers on clutch housing.
Replace breathers.
Step 3.
Check for damaged gaskets or seals.
Refer problem to Direct Support Maintenance.
TRANSFER CASE NOISY (OIL LEVEL OKAY):
Refer problem to Direct Support Maintenance.
7-2
