Maintaining the Hand Valve
This valve requires no periodic maintenance.
If a problem is traced to the hand valve, turn the system off and remove the cartridge. Clean and
inspect the cartridge. Make sure the handle returns to center on it’s own. If it doesn’t, it may need a
spring kit.
There are usually multiple relief valves within the same system. They must be set at least 100 psi apart
from each other or they will “chatter”. Adjusting one valve to be set differently than another should
eliminate the problem. Example: Pump relief valve 2000 psi, packer relief valve 1900 psi, lifter relief
valve 1650 psi.
Maintaining the PO Check Valve
PO Check Valve: D63580
The valve locks the oil from escaping unless
the hand control is activated. This locks
equipment in position and prevents drifting
when equipment is idle. It also acts as a
safety, in the event of a broken hose, the
valve stops the movement of the equipment.
This valve is not adjustable.
This valve requires no periodic maintenance.
If a problem is traced back to the PO check,
turn off the system and remove the cartridge.
Clean and inspect for damage. Replace
cartridge if needed, flush the valve, rebuild
and install.
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