ST-45 PUMP — MAINTENANCE (PUMP)

ST45 PRESSURE SETTING SEQUENCE

To set maximum pump pressure:

1.With the engine turned “OFF”, loosen the ¼” hydraulic hose attached to the compensator valve located on the top of the Main Delta Q Pump.

Figure 44. Compensator Valve

2.Loosen the jam nut located on the end of the compensator valve (Figure 44).

3.Turn the compensator adjustment nut (Figure 44) clockwise until tight. Tighten the ¼” hose leading to the compensator.

4.Start the engine and loosen the jam nut located on the maximum relief valve cartridge (Figure 45).

5.Run the engine at maximum RPM (2550) and turn the volume control knob counter-clockwiseto maximum volume position (Figure 45).

MAXIMUM RELIEF

VALVE CARTRIDGE

JAM NUT

MAIN

RELIEF VALVE

VOLUME

CONTROL

Figure 45. Hydraulic Drive Pump Manifold

6.On the electrical control panel, 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 3500 PSI.The reading can be taken from the pumping pressure gauge (Figure 46).

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 46. 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 44) counter- clockwise ½ turn. Tighten the ¼” 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 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 PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 47

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Multiquip ST-45HRM manual ST45 Pressure Setting Sequence, To set maximum pump pressure
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ST-45HRM specifications

The Multiquip ST-45HRM is a highly versatile and robust soil compactor designed for various construction applications. With its advanced engineering and innovative technologies, it sets a new standard in the compaction equipment market. This model is particularly favored for its reliability, durability, and exceptional performance in both small-scale and large-scale projects.

One of the standout features of the ST-45HRM is its powerful engine. Equipped with a high-performance, fuel-efficient diesel engine, it delivers ample power while ensuring reduced fuel consumption. This results in not only lower operational costs but also decreased environmental impact, aligning with today's sustainability goals.

The compactor's dual-directional capability allows for efficient operation in compacting various soil types. Whether tackling granular, cohesive, or mixed soils, the ST-45HRM adapts seamlessly, ensuring optimal performance. Furthermore, it features a unique vibratory system that maximizes compaction efficiency, enabling faster job completion and minimizing the number of passes required.

Operator comfort and safety are paramount in the design of the ST-45HRM. The machine is equipped with an ergonomic operating platform and intuitive controls, allowing for easy maneuverability even in tight spaces. The advanced vibration dampening technology significantly reduces operator fatigue, making long hours of operation more manageable.

Additionally, the ST-45HRM offers impressive maneuverability, thanks to its compact size and precise control. This is particularly beneficial for working in confined areas, such as urban construction sites where space is limited. Its robust construction ensures it can withstand the rigors of challenging job sites while maintaining performance.

Maintenance is made simple with the ST-45HRM. The design allows for easy access to key components, reducing downtime and enhancing productivity. Regular service intervals and the use of quality materials ensure the longevity of the machine, making it a smart investment for contractors looking for reliable and efficient compaction equipment.

In summary, the Multiquip ST-45HRM combines powerful performance, innovative technology, comfort, and ease of maintenance into a single, versatile package. It is an ideal choice for contractors seeking a dependable soil compactor to meet the demands of various construction projects. With its impressive features and capabilities, the ST-45HRM stands out as a leader in the field of soil compaction.
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