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VALVES - RELIEF
This is a direct acting valve that limits the maximum operating pressure in the system. When the
system pressure reaches the relief valve setting, the valve’s piston shifts to allow excess pump output to be vented directly to the tank line.
NOTE: This system uses a pressure compensated variable displacement pump which reduces its
own output as the pressure reaches the compensator’s setting. The relief valve is a backup for
the pressure compensator on the pump and should only open momentarily to relieve any pressure
spike in the system. The relief valve setting should be approximately 200 psi above the compensator’s setting.
SETTING: Place keyed selector switch in the “HAND” mode and start pump:
1) Loosen adjusting screw locking nut on RV1 and turn the adjust screw in several turns.
2) Loosen the adjusting screw locking nut on the pump compensator screw**.
3) Advance the #2 cylinder forward against the gate and hold.
4) Turn pump maximum pressure adjusting screw in until the system pressure is
approximately 50 psi (3.4 Bar) above the desired relief valve setting.
5) Turn adjusting screw on RV1 until the desired setting is reached, not exceeding 2600 psi
(180 Bar) and tighten locknut.
CAUTION: Do not run pump in this mode for a long period of time because it will over load
the motor.
6) Adjust maximum pressure adjusting screw setting down to its operating setting, 2400 psi
(165 Bar) max and tighten locknut.
7) Retract the #2 cylinder.
The diverter valve acts to both block and flow of oil to tank and as a reduced pressure relief valve
for the gate, the cover lock (when used) and the side hopper (optional) circuits.
SETTING: Place keyed selector switch in the “HAND” made, start pump:
1) Loosen adjusting screw locknut on the diverter valve.
2) Manually shift the solenoid on the diverter valve and hold.
3) Adjust the pressure to 1200 psi (83 Bar) using the adjusting screw, and tighten locknut.
4) Release the solenoid on the diverter valve.
*To manually “override” a solenoid operated valve: Locate the “plunger” in the appropriate end of
the solenoid housing and depress it with a suitable tool.
**The hex head bolt (on the manifold side of the pump) is the compensator screw and adjusts the
maximum pressure of the pump; the long threaded rod on the opposite side of the compensator is
the maximum volume stop.
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