Operator`s manual

PROBLEM POSSIBLE CAUSE REMEDY

External leakage Control valve tie bolts Torque bolts to

loose 20 ft.lbs.

Damaged O-rings Repair control valve

between valve sections

Damaged O-rings on Repair control valve

valve spools

Cylinder seals damaged Repair cylinder

Damaged O-rings on Repair control valve

valve drop check

Broken oil lines Replace hose and

check for leaks

Swing cylinder Oil leaking past pack- Replace packing or

malfunctioning ing or seals seals

Faulty relief valve Clean or replace

Control valve sticking or Dirty valve Clean valve

working hard

Scored bore or bent Replace valve section

spool

Control linkage mis- Correct misalignment

aligned

Control valve tie bolts Tighten bolts only to

too tight 20 ft.lbs.

Return spring binding Replace spring

or broken

Foreign matter in spool Clean valve

bore

TROUBLESHOOTING

3913

8-13-91