Fluid Motor
MOTOR WILL NOT TURN
CAUSE REMEDY
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
CAUSE REMEDY
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
CAUSE REMEDY
Hose connections wrong Reverse connections
Wrong timing Re-time motor
ERRATIC MOTOR OPERATION
CAUSE REMEDY
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
CAUSE REMEDY
Worn or cut shaft seal Replace shaft seal
417P/N 12261-683 REVISED: January 2015
To Next Page
Loading...
