Multiquip ST-45HRM manual Pilot Relief Valve Cartridge Adjustment

ST-45 PUMP — MAINTENANCE (PUMP)

SETTING PRESSURE INTHE ACCUMULATOR CIRCUIT

1.Attach a 3000 PSI test gauge (Mayco P/N 98016) to port G2 of the main manifold block (Figure 49).

3000 PSI

PRESSURE TEST GAUGE

P/N: 98016

4.Loosen the lock nut for the the accumulator circuit pilot relief valve cartridge (Figure 51), located at port G4.Using an allen wrench, turn the adjusting screw until pressure gauge reads 1950 PSI and tighten lock nut. Turn the engine off and on several times to make the pressure continues to read 1950 PSI.

PILOT RELIEF

ADJUSTMENTVALVE CARTRIDGE SCREW

LOCK NUT

Figure 51. Pilot Relief Valve Cartridge Adjustment

Figure 49. Accumulator Circuit PressureTest Gauge

2.Loosen the lock nut on the unloading valve cartridge (Figure 50) and using an allen wrench, turn the adjusting screw clockwise until it is completely closed.

5.Turn the unloading valve cartridge adjusting screw counter-clockwise until the pressure reaches 1750 PSI on the accumulator pressure gauge (Figure 29). Start and stop the pump several times to make sure the accumulator circuit pressure is holding at 1750 PSI.

6.Tighten the lock nut on the unloading valve cartridge.Your accumulator circuit pressure should now be properly adjusted.

ADJUSTMENT

SCREW

UNLOADING

VALVE CARTRIDGE

LOCK NUT

Figure 50. Unloading Valve Cartridge Adjustment

3.Turn the pump control switch (Figure 22) to the “ON” position and run engine at 2550 RPM.

MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 49