Multiquip ST-45HRM CE ST-45HRMCE CONCRETE PUMP— MAINTENANCE PUMP, ST45 PRESSURE SETTING SEQUENCE

ST-45HRM CE CONCRETE PUMP— MAINTENANCE (PUMP)

ST45 PRESSURE SETTING SEQUENCE

To set maximum pump pressure:

1.With the engine turned “OFF”, loosen the 6.4 mm (1/4- inch) hydraulic hose attached to the compensator valve located on the top of the Main Delta Q Pump.

Figure 50. Compensator Valve

2.Loosen the jam nut located on the end of the compensator valve (Figure 50).

3.Turn the compensator adjustment nut (Figure 50) clockwise until tight.Tighten the 6.4 mm (1/4-inch) hose leading to the compensator.

4.Start the engine and loosen the jam nut located on the maximum relief valve cartridge (Figure 51).

5.Run the engine at maximum RPM (2,550) and turn the volume control knob counter-clockwiseto maximum volume position (Figure 51).

MAXIMUM RELIEF

VALVE CARTRIDGE

JAM NUT

MAIN

RELIEF VALVE

VOLUME

CONTROL

Figure 51. Hydraulic Drive Pump Manifold

6.On the control box, turn the pump control switch (Figure

22)and the test switch (Figure 31) to the “ON” position. Using an allen wrench, adjust the main relief valve (Figure

45)to 24.13 mPa (3,500 PSI). The reading can be taken from the pumping pressure gauge (Figure 52).

7.Hold the main relief valve adjusting bolt with a wrench and tighten the jam nut. Using the test switch, double check the pressure reading to make sure the setting has not changed.

Figure 52. Pumping Pressure Gauge

8.Turn the engine off and loosen the hose from the compensator valve. Loosen the jam nut and turn the compensator adjustment nut (Figure 50) counter- clockwise ½ turn. Tighten the 6.4 mm (1/4-inch) hydraulic hose.

9.Start engine and run at maximum RPM with volume control at maximum volume (fully counter-clockwise). Turn the pressure test switch (Figure 31) to the “ON” position. The pumping pressure gauge should now read 22.75 mPa (3300 PSI). It may be necessary to repeat the above steps to achieve the proper pressure settings. After the adjustment, make sure the compensator valve jam nut is locked tight.

MAYCO ST-45HRM CE PUMP — OPERATION & PARTS MANUAL — REV. #0 (02/23/04) — PAGE 53