Komatsu 830E-AC Shop Manual page 788

Trouble
Visible damage in the
following areas:
• Sandblasted band
around pressure plate
bores
• Angle groove on
face of pressure plate
• Lube groove
enlarged and edges
rounded
• Dull area on shaft at
root of tooth
• Dull finish on shaft
in bearing area
• Sandblasted gear
bore in housing
Visible damage in the
following areas:
• Scored pressure
plates
• Scored shafts
• Scored gear bore
External damage to
pump
Damage on rear of
drive gear and rear
pressure plate only
Eroded pump hous-
ing or pressure plate
Excessive wear on
pressure plate and/or
end of gear
L10-20
TROUBLESHOOTING CHART
(Hoist Pump)
Possible Cause
Abrasive wear caused by fine parti-
cles in oil supply — Dirt (fine contami-
nants, not visible to the eye).
Abrasive wear caused by metal parti-
cles — Metal (coarse contaminants,
visible to the eye).
Incorrect installation.
Defective pump driveshaft.
Aeration - cavitation
• Restricted oil flow to pump
• Aerated oil
Lack of oil.
Hydraulic Check-out Procedure
Suggested Corrective Action
Change hydraulic oil.
Hydraulic filters may need changing.
Verify correct filter elements are being used.
Check hoist and steering cylinders for dents,
scoring, or seal damage.
Entire hydraulic system may require com-
plete cleaning (See Flushing Procedure in
the following pages).
Entire hydraulic system may require com-
plete cleaning (See Flushing Procedure in
the following pages).
Check other hydraulic system components
for possible source of contaminants.
Remove and repair as required.
Check pump driveshaft.
Check cross and bearings for smooth oper-
ation.
Check for adequate joint lubrication.
Check hydraulic tank oil level.
Verify correct oil viscosity.
Check for restriction or air leak at pump inlet
line.
Check for loose fittings, clamps etc.
Check hydraulic oil level.
Check pump inlet hoses for obstructions or
leaks.
L10028