PROBLEM
POSSIBLE CAUSE
REMEDY
System will not operate
1. Oil supply low.
Check oil level and fill.
in either direction
2. Oil Filters clogged.
Replace Filter Element.
3. Oil too heavy.
Use proper viscosity oil.
4. Control linkage misadjusted.
Check to see if control linkage is
binding or unfastened
5. Low charge pressure
See remedy for Causes “6-9”.
Pressure should be 300-350,
100 PSI minimum.
6. Gear pump input shaft damaged.
Inspect gear pump input shaft for
damage.
7. Auxiliary pump charge relief valve
Replace or adjust relief valve.
damaged.
8. Gear pump gears worn or scored.
Replace defective parts.
9. Gear pump damaged.
Disassemble, inspect for damage.
10. Relief valve stuck open.
Remove, clean or replace.
11. Damaged check valve.
Dissassemble and check if valve is
faulty or damaged.
System noisy.
12. Air in system.
Low oil level in Reservoir.
13. Loose suction line.
Tighten fittings or lose hose.
14. Clogged Suction Filter.
Replace Element.
15. Internal Pump or Motor damage.
Dissassemble, inspect, repair or replace.
Sluggish response to
See Cause “12”.
Also see remedy for Causes “1-3, 13”.
acceleration or
decceleration.
See Cause “15”.
16. Low charge pressure.
See remedy for Causes “6, 7, 9”.
17. Relief Valve dirty or damaged.
Remove, clean or replace.
Oil leaking from Pump
18. Defective seal.
Replace seal and/or complete
or Motor.
assembly.
HYDRAULIC PUMP AND MOTORS SYSTEM
Printed In U.S.A.
41
907389/AP297
Discount-Equipment.com
