HYDRAULIC INSTALLATION
SHUT-OFF VALVES
Pressure test ports (k8) are located in the shut-off valves (and check valves). Each
shut-off valve has an “ON” (k5) and an “OFF” (k6) position.
NOTE: When operating the NPK Compactor/Driver on a carrier with a return line shut-
off valve, be sure the valve is turned to the “ON” position to prevent damage to the
Compactor/Driver’s hydraulic motor.
RETURN OIL
The return line must be routed correctly and sized large enough to handle the oil flow
without creating excessive back pressure. The return oil MUST NOT go through a
control valve. It must be connected directly to the carrier’s hydraulic reservoir via the oil
cooler and return filter (or an NPK filter, if supplied).
To prevent failure of the hydraulic motor shaft seals, motor shaft or motor thrust plates,
the return line back pressure must not exceed 150 psi (10 bar). See the
“TROUBLESHOOTING”, MEASURING BACK PRESSURE section of the
INSTRUCTION MANUAL.
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