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 TM 10-3930-644-14&P
C. HYDRAULIC SYSTEM
TROUBLE
PROBABLE CAUSE
POSSIBLE SOLUTION
Unable to lift or
Load too heavy.
Check capacity on Serial No. Plate.
tilt load.
Insufficient or no oil.
Check tank for proper oil level and plugged
suction line.
Air leak at suction line.
Tighten connections.
Damaged or worn pump.
Remove and repair.
Relief valve binding open.
Remove and repair.
Broken lift chains.
Repair.
Obstruction in hydraulic lines.
Check flow of oil from pump through hydraulic
system.
Damaged lift cylinder.
Check for binding or any reason for inoperative
plunger.
Control valve inoperative.
Inspect for internal leakage or damaged parts
and repair.
Lift and tilt too
Engine speed governed too low.
inspect governor controls and adjustment.
slow.
Internal leakage at pump.
Inspect for worn or damaged parts.
Excessive leakage at cylinder
Repair or replace packing.
packing.
Air leaks in system.
Tighten all connections.
Misalignment.
Check masts, carnage or tilt linkage for cause
of binding.
Faulty relief valve.
Check for worn or damaged parts. Repair or
replace. Check relief valve setting.
Load creeps-
Internal leakage in cylinders.
Repair or replace packing.
tilting or
lowering.
Oil leak at packing glands.
Repair or replace packing.
2-108
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