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TM 10-3930-632-34
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
COOLING SYSTEM
1.
COOLING SOLUTION IS LOW.
Step 1.
Check radiator for leaks.
Repair radiator (para 7-3).
ELECTRICAL SYSTEM
1.
STARTER MOTOR CRANKS ENGINE SLOWLY.
Step 1.
Inspect for dirty commutator.
Clean commutator (para 5-10).
Step 2.
Check wear condition of brushes.
Replace brushes (para 5-9).
Step 3.
Test starter motor (TM 10-3930-632-12).
Overhaul starter motor if defective (para 5-7).
2.
STARTER MOTOR DOES NOT CRANK ENGINE.
Step 1.
Check for faulty drive mechanism.
Overhaul drive mechanism (para 5-7).
Step 2.
Check for faulty solenoid switch.
Replace switch (para 5-7).
3.
LOW OR FLUCTUATING ALTERNATOR OUTPUT.
Step 1.
Inspect brushes for wear.
Replace brushes (para 5-4).
4.
ALTERNATOR IS NOISY.
Step 1.
Inspect for defective bearings or bent armature.
Replace defective parts (para 5-4).
Step 2.
Check brushes for alignment.
Align or seat brushes.
DRIVE AXLE
1.
CONTINUOUS DRIVE AXLE NOISE.
Step 1.
Check for badly worn parts.
Replace worn parts (para 12-2).
2.
COMPLETE FAILURE OF DRIVE AXLE TO FUNCTION.
Step 1.
Check for broken teeth on ring gear or pinion gear.
Replace ring gear, pinion, and other parts as necessary (para 12-2).
3.
DRIVE AXLE NOISE OCCURS ON DRIVE OR COAST ONLY.
Step 1.
Differential, pinion gear and ring gear out of adjustment or worn.
Adjust, repair or replace unit (para 12-2).
4.
EXCESSIVE BACKLASH IN DRIVE AXLE.
Step 1.
Check for loose axle shaft drive flange capscrews.
Tighten capscrews.
Step 2.
Check for maladjusted or worn differential drive pinion gear and ring gear.
Adjust or replace (para 12-2).
STEERING SYSTEM
1.
STEERING IS DIFFICULT.
Step 1.
Check for tight steering system connections.
Adjust linkage (TM 10-3930-632-12).
Step 2.
Check for tight steering gear and misaligned wheels.
Align and adjust steering gear and axle (paras 2-7 and 13-2).
Step 3.
Inspect for bent pitman arm.
Replace pitman arm (para 13-2).
2.
TRUCK WANDERING OR WEAVING.
Step 1.
Check for proper toe-in, camber, or caster (axle twisted).
Repair and adjust axle (para 12-2).
Step 2.
Check for worn or maladjusted steering gear.
Repair, replace, or adjust steering gear (para 2-7).
3.
SHIMMY OR WOBBLE OCCURS AT LOW SPEED.
Step 1.
Check for loose steering connections.
Adjust and tighten linkage (TM 10-3930-632-12).
Step 2.
Check for worn or loose adjustment on steering gear.
Repair, replace, or adjust steering gear (para 2-7).
4.
VEHICLE PULLS TO ONE SIDE.
Step 1.
Inspect for bent steering knuckle.
Straighten or replace bent linkage (para 13-4).
2-3

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