OP000497
6-5
Troubleshooting
HYDRAULIC PUMP
SWING SYSTEM
Problem
Possible Cause
Remedy
Poor oil delivery.
Hydraulic oil level low.
Add oil.
Suction filter restricted.
Clean or replace filter.
Pressure does not rise.
Oil leak from inside pump.
Replace pump.
Air in pump.
Add oil or check suction side hose.
Main relief valve pressure set too
low.
Adjust pressure.
Unusual sound from
hydraulic pump.
Cavitation from bent suction side
hose or clogged suction filter.
Replace hose and filter.
Cavitation from suction side fittings
and air in system due to low oil
level.
Tighten fittings and add oil.
Cavitation due to high viscosity oil.
Replace oil.
Pump and engine not aligned.
Readjust shaft.
Air in hydraulic oil.
Bleed.
Oil leak from outside pump.
Bad hydraulic pump seal.
Replace seal or pump.
Problem
Possible Cause
Remedy
Swing power weak.
Hydraulic motor performs poorly.
Replace hydraulic motor.
Swing bearing seized.
Grease or replace swivel bearing.
Braking power weak.
Brake valve pressure set low.
Adjust pressure.
Foreign material in port relief or
brake valves.
Clean valves.
Swing motion drags while
stopping.
Port relief or brake valve pressure
set low.
Adjust pressure.
Foreign material in port relief or
brake valves.
Clean valves.
Unusual sound.
Air in system.
Add oil.
Swing bearing needs grease.
Grease.
Summary of Contents for DX35Z
Page 2: ......
Page 6: ...Table of Contents K1025196E IV Index 8 1 ...
Page 60: ...OP000468 Safety 1 54 ...
Page 90: ...OP000469 Operating Controls 2 30 ...
Page 132: ...OP000470 Operation 3 42 ...