Section III: Maintenance
Page 82
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REV. 4 - 07/10
HYDRAULIC CLUTCH PUMP
Problem Cause Solution
No oil flow from a. No oil in reservoir a. Fill hydraulic reservoir
pump b. Pump not “primed” b. Fill inlet hose from pump
end
c. Clutch not engaging c. Check wiring/fuse
Pump will not build a. Relief valve improperly set a. Adjust relief valve to manu-
or hold pressure facturers specification
b. Relief valve stuck open b. Remove, clean and reset
Pump is noisy - a. Air in the system a. See “Oil Foaming”
whines b. Cavitation b. Check Hoses, Reservoir
breather or strainer
Pump is noisy - a. Belts are worn/loose a. Inspect, adjust and/or
squeals replace
b. System horsepower b. Review application
demand exceeds belt
capacity
c. Clutch is slipping c. Check voltage/ground
Pump ‘throws” belts a. Engine and pump pulley a. Check installation
alignment
b. System horsepower b. Review application
demand exceeds belt
capacity
c. High-speed engagement c. Reduce start-up RPM
Pump leaks at shaft a. Damaged seal a. Replace seal
seal b. Damaged pump body b. Replace pump body
Pump leaks at body a. Damaged seal a. Replace seal
section b. Damaged pump body b. Replace pump body
c. Body section bolt torque c. Torque to specification
Pump leaks a a. Loose fitting a. Inspect and/or tighten
fittings b. Damaged fitting b. Replace fitting
c. Damaged pump body c. Replace pump body
Pump is overheating a. Low oil level a. Fill hydraulic reservoir
b. Dirty oil b. Replace oil and filter
c. Relief valve stuck open c. Remove, clean and reset
d. Relief valve improperly set d. Adjust relief valve to manu-
facturers specification
e. Improper weight oil e. Replace with correct oil
Oil foaming a. Low oil lever a. Fill hydraulic reservior
b. Improper oil b. Fill with correct oil
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