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 TM 10-3930-621-34
Table 2-1. Troubleshooting - Continued
Malfunction
Probable cause
Corrective action
e. Faulty transmission pressure pump.
6. Transmlssonh- does not shift. or,'
e. Check pump pressure and repair
truck will not move. Continued
f. Incorrect forward and reverse clutch
f. Check transmission and clutch
pressures.
pressures and repair (para 6-71.
g. Incorrect converter pressure.
g. Check converter pressure and repair
(para 6-7 1).
a. Replace rings (para 3-26).
7. Smoky exhaust
a. Worn pistons, out-of-round and
tapered cylinders (blue smoke).
8. Ammeter not registering.
a. Dirty alternator commutator.
a. Clean commutator
b. Worn alternator brushes.
b. Replace (para 5-5).
c. Test and replace (TM 3930-621-121
c. Grounded or open alternator rotor.
or repair (para 5-4, 5-5, and 5-61.
d. Grounded or open alternator stator.
d. Test and replace (TM 10-3930-621-
12) or repair (para 5-4).
e. Test and replace (TM 10-3930-621-
e. Shorted or open alternator diode.
12) or repair (para 5.4).
9. Starter motor failure.
a.
Commutator dirty.
a.
Clean (para 5-10).
b.
b.
Worn brushes.
Replace (para 5-12).
c.
Broken drive unit.
c.
Replace.
d.
d.
Broken teeth on flywheel ring gear.
Replace ring gear (para 3-13).
10. Failure to move.
a. Broken axle pinion shaft.
a. Replace (para 7-2).
b. Teeth broken on axle pinion shaft or
b. Replace (para 7-2).
bull gear.
c. Broken teeth on differential ring gear
c. Replace both ring gear and pinion;
or pinion.
they are a matched set (para 7-4).
11. Axle noise on drive or coast.
a. Excessive wear on ring gear or pinion.
a. Adjust if possible, or replace (para 7-
4c).
b. Worn pinion gears or side gears in
b. Replace worn gears (para 7-4).
differential case.
12. Continuous axle noise.
Excessive wear in gear train.
Replace worn parts (para 7-4).
13. Excessive backlash in drive unit.
a. Worn splines on axle pinion shaft.
a. Replace axle pinion shaft (para 7-21.
b. Replace (para 7-4).
b. Worn pinion, ring gear or differential
case pinion.
c. Loose or worn propeller shaft cross
c. Tighten or replace (TM 10-3930-
assemblies.
621-12).
a. External leak in system or leak past
14. Brake pedal goes to toe board.
a. Check system and master cylinder for
master cylinder piston cup.
leak, and repair (para 8-5).
a. Mineral oil in brake system.
15
Bothl brakes drag
a. Clean out system, replace cups in
cylinders (para 8-4) and refill with
approved brake fluid (TM 10-3930-
621-12).
b. Breather port in master cylinder
b. Clean out breather port (para 8-5).
clogged..
16. One wheel drags.
a. Obstructed brake line.
a. Remove obstruction or repair line.
b. Swollen wheel cylinder piston cups,
b. Replace defective or damaged parts
or piston binding.
I17 Tr'uck pulls !( one side.
lining charred or drum scored.
Replace lining. Repair or replace drum
(TM 10-3930-621-12).
18. Loss of coolant.
a. Cracked engine block.
a. Replace damaged part (para 3-3).
b. Repair or replace (para 5-18).
b. Leaking radiator.
19. Loss steering.
a. Bent or loose linkage and knuckle
a. Repair, replace or adjust (TM 10-
pins.
3930-621-12).
2-2
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