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TM 5-2420-222-34
Table 2-1. Troubleshooting (Con’t).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Check for worn or damaged lock collar splines.
Replace lock collar (see paragraph 8-9).
Step 3.
Check for worn or damaged bevel pinion gear (see paragraph 8-7).
Replace bevel pinion gear (see paragraph 8-7).
20.
TRANSMISSION JUMPS WHEN ENGAGED.
Perform transmission oil pressure test (see paragraph 8-1).
Repair or replace reverser clutch control valve assembly (see paragraph 8-20).
21.
CLUTCH OR BRAKE SLIPS UNDER LOAD.
With engine running, engage clutch pedal with reverser lever in forward position until unit moves (see TM 5-
2420-222-10). Depress clutch pedal and lock brakes. Place transmission in eighth gear. Run engine at fast
idle and engage clutch. Engine must stall within five seconds after clutch pedal is released. Repeat stall with
reverser lever in reverse position and transmission in fourth gear.
If engine does not stall within five seconds, repair or replace reverser clutch control valve
assembly (see paragraph 8-20). Repair reverser clutch drum and disks (see paragraph 8-18).
REAR AXLE HOUSING
22.
REAR AXLE HOUSING NOISY.
Step 1.
Check for broken axle shaft, bearings, or planetary pinion carrier.
Repair or replace as required (see paragraph 9-3).
Step 2.
Check for broken final drive shaft or pinion gear (see paragraph 8-6).
Replace final drive shaft or pinion gear (see paragraph 8-6).
BRAKES
23.
EXCESSIVE PEDAL LEAK-DOWN.
Step 1.
Check hydraulic brake cylinder for leaking pistons (see paragraph 10-4).
Replace preformed packing on piston (see paragraph 10-4).
2-10
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