OP000497
Troubleshooting
6-4
HYDRAULIC MOTOR
HYDRAULIC CYLINDER
Problem
Possible Cause
Remedy
Hydraulic motor does not
rotate.
Hydraulic oil low.
Add oil.
Hydraulic pump bad.
Replace pump.
Oil leak from inside hydraulic
motor.
Replace motor.
Overload applied to output shaft.
Locate and remove cause of overload.
Low viscosity hydraulic oil.
Change to oil with correct viscosity.
Hydraulic motor will not
allow turning to one side.
Bad control valve relief valve.
Clean or replace relief valve.
Counterbalance valve spool
sticking.
Replace counterbalance valve.
RPM low.
Main or port relief valve pressure
set too low.
Add oil.
Oil leak due to excessive high
temperature.
Reduce oil temperature.
Air in system.
Bleed.
Oil leak from inside motor.
Replace motor.
Unusual sound from
hydraulic motor.
Hydraulic oil level low.
Add oil.
Air in motor.
Retighten fittings on suction side.
Wear and damage inside hydraulic
motor.
Replace motor.
Shaft not properly installed.
Readjust shaft.
Problem
Possible Cause
Remedy
Lack of cylinder power.
Relief valve pressure set too low.
Adjust pressure.
Oil leak from inside cylinder.
Replace cylinder seals.
Cylinder piston or rod damaged.
Replace piston or rod.
Oil leak from inside control valve.
Replace valve housing assembly.
Oil leak from outside
cylinder.
Bad hydraulic cylinder seals.
Replace seals.
Damaged cylinder rod.
Replace rod.
Unsmooth piston
movement.
Hydraulic oil temperature high.
Lower temperature.
Air in system.
Retighten fittings on oil fill and suction
sides.
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 ...