12
Troubleshooting Guide
Problem
Possible Cause
Solution
PowerGrip jaw does not hold position
Excessive force being applied to jaw is
causing relief valve to open.
A bi-directional hydraulic motor control
valve is being used without the bucket
load control valve.
Load control valve is leaking.
Seals are leaking oil.
This is normal. The relief valve limits
the force applied to the bucket jaw to
prevent damage to the unit.
Install bucket load control valve.
Test, repair or replace as needed.
Test and replace seals as necessary.
Jaw moves only in one direction
Single directional control valve is being
used.
Load control valve manifold is
obstructed.
Hydraulic hose is internally damaged.
Replace with bi-directional
control valve.
Clean manifold passageways(s).
Test and replace damaged hose.
PowerGrip Bucket has spongy feel
Air in PowerGrip actuator or hydraulic
circuit.
Bleed air from circuit and check
for cause.
Side to side (axial play) movement of
jaw
Worn or missing thrust washers.
Replace or install thrust washers.
PowerGrip will not accept grease
at grease fittings.
Grease relief valve is not functioning, or
it has been replaced with a grease fitting
or plug.
Clean or replace grease relief valves.
INSTALLATION AND MOUNTING
