Fluid Motor
CONDITION CAUSE REMEDY
MOTOR WILL NOT TURN Pumps not engaged Engage pumps
No oil Fill reservoir to proper oil level
Pump broken Replace pump
Relief valve stuck open or set
too low
Clean and free relief valve
spool and adjust to proper
setting
Work load jammed or stuck Remove obstruction from
work load
Large contaminating foreign
bodies in fluid
Flush hydraulic system
completely. Use new oil and
install new filters
SLOW OPERATION Wrong oil viscosity Use proper viscosity oil.
Rotary manifold leaking Reseal rotary manifold
Worn pump Repair or replace pump
Extremely high fluid
temperatures causing pump
and motor to slip
(temperature increases as
pump and motor wear)
Add heat exchangers
Relief setting too low Set relief valve for proper psi
MOTOR TURNS IN WRONG
DIRECTION
Hose connections wrong Reverse connections
Wrong timing Re-time motor
ERRATIC MOTOR
OPERATION
Relief valve pressure set too
low
Adjust relief valve setting
Low oil level in reservoir
permitting air to enter system
Fill reservoir to proper level
Air being “sucked in” on inlet
side of pump
Tighten fitting(s) on pump
inlet side
LEAK AT SHAFT Worn or cut shaft seal Replace shaft seal
LEAK BETWEEN HOUSING
AND WEAR PLATE OR
BETWEEN WEAR PLATE
AND GEROLER ASSEMBLY
Motor housing bolts loose Clean mating surfaces and
tighten nuts to appropriate
value.
Pinched “O” ring seal Replace
LEAK AT OIL PORTS Damaged seal or “O” ring Replace “O” ring or seal
Poor fittings Replace fittings carefully
Damaged threads Replace housing
RT500
Troubleshooting
228 REVISED:
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