HYDRAULIC INSTALLATION
COMPACTOR CONTROL VALVE
1. CONTROL SYSTEM USING THE CARRIER AUXILIARY OR SPARE VALVE
SECTION.
This type of installation uses an existing carrier auxiliary valve to operate the NPK
Compactor/Driver. Additional parts, such as mechanical linkage, hydraulic pilot
control valves, etc. can be furnished in an NPK HYDRAULIC INSTALLATION KIT.
2. CONTROL SYSTEM USING THE NPK FLOW VALVE (MULTIVALVE).
For carriers not equipped with an auxiliary or spare valve section as part of the
control valve bank, the NPK HYDRAULIC INSTALLATION KIT typically includes a
solenoid operated, priority valve to operate the NPK Compactor/Driver. (The NPK
Multivalve is specifically designed for the operation of boom mounted attachments.)
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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