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 TM 10-3930-644-14&P
C. HYDRAULIC SYSTEM (CONT)
TROUBLE
PROBABLE CAUSE
POSSIBLE SOLUTION
Load creeps-
Leak in control valve.
Check for worn or damaged plungers.
tilting or
lowering.
Leaks in oil lines.
Tighten all connections or replace damaged
(Continued)
lines.
Noisy hydraulic
Insufficient or no oil.
Check tank for proper oil level or restricted
pump.
suction line.
Air leaks.
Tighten intake connections.
Air bubbles in intake oil.
Use hydraulic oil with antifoaming character-
istics.
Oil reservoir breather re-
Replace breather.
stricted.
Coupling misalignment.
Realign.
Pump head loose.
Tighten.
Worn or broken parts.
Replace.
Hydraulic-oil
Pump too tight alter overhaul.
Remove and repair.
overheating.
Restricted lines.
Check and repair.
Relief valve set too high.
Valve should be set as recommended.
Incorrect oil.
Drain. replace filter and use only recom-
mended oil.
Internal oil leakage.
Repair or replace pump.
D. DRIVE UNIT
TROUBLE
PROBABLE CAUSE
POSSIBLE SOLUTION
Failure to op-
Broken jackshaft/axleshaft.
Replace jackshaft/axleshaft.
erate.
Teeth broken out of jackshaft.
Replace jackshaft, bull gear. axleshaft, or
bull gear. axleshaft. or
planetary.
planetary cluster.
Broken teeth on ring gear or
Replace ring gear and pinion.
pinion.
Axle noise on
Excessive wear at ring gear
Adjust. if possible. or replace.
drive or coast.
and pinion.
Worn pinion gears or side gears
Replace worn gears.
in differential case.
Continuous
Excessive wear in gears.
Replace worn parts.
axle noise.
Lack of lubrication.
Lubricate with specified lubricant.
Uneven tire wear.
Replace tires.
Worn or damaged bearing.
Replace bearings.
2-109
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