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TROUBLE
1. Sandblasted band around pressure
plate bores
2. Angle groove on face of pressure
plate
3. Lube groove enlarged and edges
rounded
4. Dull area on shaft at root of tooth
5. Dull finish on shaft in bearing area
6. Sandblasted gear bore in housing
1. Scored pressure plates.
2. Scored shafts
3. Scored gear bore
1. Any external damage to pump
2. Damage on rear of drive gear and
rear pressure plate only
1. Eroded pump housing
2. Eroded pressure plates
1. Heavy wear on pressure plate
2. Heavy wear on end of gear
1. Housing scored heavily
2. Inlet peened and battered
3. Foreign object caught in gear teeth
1. Pressure plate black
2. O-rings and seals brittle
3. Gear and journals black
1. Broken shaft
2. Broken housing or flange
L03027
TROUBLESHOOTING GUIDE
(HOIST PUMP)
POSSIBLE CAUSE
1. Abrasive wear caused by fine
particles.
a. Dirt (fine contaminants, not visible
to the eye)
2. Abrasive wear caused by metal
particles
a. Metal (coarse)contaminants,
visible to the eye
3. Incorrect installation
4. Aeration-Cavitation
a. Restricted oil flow to pump inlet
b. Aerated Oil
5. Lack of oil
6. Damage caused by metal object
7. Excessive Heat
8. Over Pressure
Hydraulic Component Repair
SUGGESTED CORRECTIVE
ACTION
1. Was clean oil used?
2. Was filter element change period
correct?
3. Were correct filter elements used?
4. Hoist cylinder rod wiper and seals in
good condition?
5. Cylinder rods dented or scored?
6. Was system flushed properly after
previous failure?
1. Was system flushed properly after
previous failure?
2. Contaminants generated elsewhere
in hydraulic system?
3. Contaminants generated by wearing
pump components?
1. Did shaft bottom in mating part?
2. Any interference between pump and
machine?
1. Tank oil level correct?
2. Oil viscosity as recommended?
3. Restriction in pump inlet line?
4. Air leak in pump inlet line?
5. Loose hose or tube connection?
1. Was oil level correct?
2. Any leaks in piping inside tank?
1. Metal object left in system during
initial assembly or previous repair?
2. Metal object generated by another
failure in system?
1. Metal object left in system during
initial assembly or previous repair?
2. Was relief valve setting too low?
3. Was oil viscosity correct?
4. Was oil level correct?
1. Relief valve setting correct?
2. Did relief valve function?
L3-13
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Table of Contents
Troubleshooting
