PowerTilt Tilting Coupler
PowerTilt Series Service & Repair Manual
HY34-1410
17
Parker Hannifin Corporation
Helac/Cylinder Division
Enumclaw, Washington USA
www.parker.com/helac
Problem
Possible Cause
Solution
PowerTilt does not hold position
Excessive down pressure applied
by the excavator can cause buildup
of pressure in the PowerTilt which is
opening the cross port relief valve.
Control valve leaking oil.
Faulty cross port relief valve.
Seals leaking oil.
This is normal. The integral cross port
relief valve is designed to protect
the PowerTilt from excessive internal
pressures that can damage the unit.
Test, repair or replace as needed.
Remove the integral cross port relief
valve and visually inspect for damage
or debris. Check pressure setting of
the cross port relief valve which can be
found in the Tool Circuit Requirements
Chart shown on page 11.
Test and replace seals as needed.
PowerTilt swings in only one direction.
Single directional control valve is being
used.
Cross port relief valve damaged.
Both lines connected to either both P1
or P2 ports of PowerTilt.
Replace with bi-directional
control valve.
Inspect, test and replace as needed.
Refer to page 16 for proper port
connection location.
PowerTilt has spongy feel side to side.
Air in PowerTilt or hydraulic circuit.
Diameter of tubing/hoses larger or
longer than recommended.
Bleed air from circuit and check
for cause.
Install new tubing/hoses with
recommended diameters.
Install pilot operated check valve in
lines as close as possible to PowerTilt.
Forward and backward movement of
shaft in the housing (shaft endplay).
Worn or missing thrust washers.
Tighten end cap according to the End
Cap Torque Chart on page 38. Replace
or install thrust washers if necessary.
Side to side bucket movement.
Some movement is normal due to
clearance required between internal
spline teeth.
Normal movement is 1° to 1-1/2°.
If greater, check shaft end play;
excessive end play can contribute to
side to side movement. If shaft end
play is not within acceptable limits,
consult PowerTilt AG.
PowerTilt will not accept grease
at fittings.
Grease relief valve is not functioning,
or it has been replaced with a grease
fitting or plug.
Clean or replace grease relief valves.
PowerTilt squeals at maximum tilt or
when stalled.
Relief valve is opening from machine
pressure.
Check relief pressure, and if within
range, reduce the pressure from the
machine to below relief pressure
setting. See page 10 for pressure
settings.
Installation and Maintenance
Troubleshooting Guide
