30
Testing for Internal Leakage
Testing Load Control Valve
Testing the Carrier's
Hydraulic System
Testing
If symptoms of poor performance develop, refer to
the Troubleshooting Guide on Page 15 for general
instructions. If you need help with more specific
application issues, contact Helac Corporation’s
Service Department.
It is the responsibility of your service technician
to verify that the carrier and hydraulic circuit are
operating correctly. Because the PowerTilt receives
its power from the carrier, a thorough check of
the carrier hydraulic system is mandatory before
performing any PowerTilt service or adjustments.
See valve manifold drawing on page 18 for locations
of ports and valve.
Valve Design
This valve has three separate cartridges that work
together to provide:
1.
Load holding with very low leakage to the tool
circuit.
2.
High pressure relief protection (when clamping).
3.
Low pressure relief protection (when open and
being pushed closed).
1.
Connect a 5,000 psi (350 bar) test gauge into
the hydraulic line to Port P2. Pressurize P2 until
the jaw closes fully.
2.
Remove and cap the hydraulic line attached to
Port P1. Pressurize port P2 to 2,500 psi (175
bar). Check for leakage at port P1 and from
around the main shaft and end cap seals. Leaks
indicate worn or improperly installed parts.
NOTICE
If the jaw is not completely closed,
hydraulic fluid will exhaust from
Port P1 at a high velocity when Port
P1 is uncapped.
POST ASSEMBLY
