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Page Title:
Table 2-1. Troubleshooting - continued |
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 Table 2-1. Troubleshooting (Continued)
Malfunction
Probable cause
Corrective action
e. Control valve inoperative.
e. Inspect for internal leakage or
damaged parts, and repair (para
a. Internal leakage at pump.
a. Inspect for worn or damaged
16. Lift and till too slow.
parts (para 4-2).
b. Excessive leakage at cylinder
b. Repair or replace packing (para
packing.
c. Air leaks in system.
c. Tighten all connections.
d. Misalignment.
d. Check mast (para 4-8) or tilt
linkage (TM 10-3930-618-20)
for cause of binding.
e. Faulty relief valve.
e. Check for worn or damaged parts.
Repair or replace (para 4-3).
a. Internal leakage in cylinders.
a. Repair or replace packing (para 4-5)
17. Load creeps when tilting or
lowering.
and para 4-6).
b. Oil leak at packing glands.
b. Repair or replace packing (para
c. Leak in control valve.
c. Check for worn or damaged
plungers (para 4-3).
d. Leaks in oil lines.
d. Tighten all connections or replace
damaged lines.
a. Check tank for proper oil level or
18. Noisy hydraulic pump.
a. Insufficient or no oil.
restricted suction line (para 4-4).
b. Air leaks.
b. Tighten intake connections.
c. Oil bubbles in intake oil.
c. Use hydraulic oil with antifoaming
characteristics. (LO 10-3930-
618-12).
d. Coupling misalignment
d. Realign.
e. Pump mounting flange I loose
e. Tighten (para 4-2).
f. Worn or broken parts.
f. Replace (para 4-2).
a. Internal oil leakage.
a. Repair or replace pump (para
19. Oil overheating.
b.
b. Remove and repair (para 4-2).
Pump too tight after overhaul.
c.
c. Check and repair.
Restricted lines.
a.
a. Replace axle (para 5-19).
20. Failure to operate.
Broken axle shaft.
b.
b. Replace axle shaft or planetary
Teeth broken on axle shaft
planetary gears.
gears. (para 5-19).
c.
c. Replace ring gear and pinion (para
Broken teeth on ring gear or
pinion.
d.
d. Replace disc (para 3-16).
Worn disc in transmission
e.
Worn transmission oil
e. Replace pump (para 3-15).
f.
f. Replace worn parts (para 3-16).
in transmission.
g.
g. Disassemble valve clean, and
Valve plunger stuck in transmis-
sion control valve.
replace worn parts (para 3-16).
a.
a. Replace disc (para 3-16).
21. Truck moves in one direction but
Worn disc in transmission.
not in other.
b. Binding valve plunger in trans-
b. Disassemble valve clean, and
mission control valve.
replace worn parts (para 3-16).
a. Excessive wear at ring gear and
a. Replace (para 5-20).
22. Axle noise drive or coast.
pinion.
b. Worn pinion gears or side gears in
b. Replace worn gears (para 5-21).
differential case.
a. Excessive wear in gear train.
a. Replace worn part (para 5-19
23. Continuous axle noise.
b. Lack of lubrication.
b. Lubricate according to LO 10-
3930-618-12.
c. Worn or damaged drive wheel
c. Replace bearings (para 5-20).
bearing.
a. Worn splines on axle shafts.
24. Excessive backlash in unit.
a. Replace axle shafts (para 5-19).
b. Worn ring gear, pinion or dif-
b. Replace gear and pinions (para
ferential case pinions.
c. Loose or worn universal joints.
c. Tighten or replace (para 5-21).
25. Pedal goes to toe board.
External leak in brake system or leak
Check master cylinder for leak and
past master cylinder piston cup.
repair (par 5-14).
a. Mineral oil in brake system.
a. Clean out system, replace cups in
26. Both brakes drag.
brake cylinders and refill with
2-3
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