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 TROUBLE
PROBABLE CAUSE
REMEDY
5-88. HYDRAULIC PUMP.
a. Pump fails to start
1. Damaged pump
Replace or overhaul pump.
pumping.
b. Low pump pressure
1. Hose leaks
Tighten or replace hoses and/or
clamps as necessary.
2. Truck engine malfunction
Refer to engine trouble-shooting.
3. Low fluid level
Add sufficient fluid or proper
type.
4. Damaged pump
Replace pump.
c. Undue pump vibration
1. Clogged pump
Clean pump.
2. Power take-off bearings defective
Replace bearings.
3. Loose mounting
Tighten mounting bolts.
5-89. UPRIGHT ASSEMBLY HYDRAULIC SYSTEM.
a. No movement of upright
1. Defective hydraulic pump
Replace or overhaul pump.
assembly
2. Excessive fluid leakage
Correct and replenish fluid supply.
3. Truck engine malfunction
Refer to engine trouble-shooting.
b. Excessive "drift" of hoist
1. External cylinder leakage
Replace packings.
and tilt cylinders
2. Internal cylinder leakage
Replace packings.
3. Leakage at hydraulic lines and
Repair, replace or tighten loose
fittings
fittings and lines.
c. Hoist cylinder will not
1. Leakage at hydraulic lines and
Repair, replace or tighten loose
maintain raised position
fittings
fittings and lines.
with load
2 Cylinder leakage
Replace packings.
d, Excessive hydraulic fluid
1. Excessive fluid leakage
Repair, replace or tighten loose
consumption
fittings and lines.
2 Cylinder leakage
Replace packings.
3 Defective hydraulic pump
Replace or overhaul hydraulic
pump.
e. Will not lift full rated
1 Excessive fluid leakage
Check fittings, lines and cylinders,
load
replace or tighten as necessary.
2 Low fluid level
Add sufficient fluid of proper type.
3 Incorrect pressure relief
Correct pressure.
5-90. BRAKES.
a. Excessive pedal travel
1 Linings worn
Replace brake linings.
2 Fluid low in master cylinder
Replenish fluid and check for
leaks.
3
Air in system
Bleed hydraulic system.
4
Pedals improperly adjusted
Adjust linkage.
b. Weak braking action
1
Oil on linings
Replace brake linings.
2
Incorrect lining
Replace brake linings.
c. Heavy braking action
1 Brake lining grease soaked
Replace brake linings.
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