ST-45 PUMP —TROUBLESHOOTING (HYDRAULIC SYSTEM)

Practically all breakdowns can be prevented by proper handling and maintenance inspections, but in the event of a breakdown, please take a remedial action following the diagnosis based on the Hydraulic System Troubleshooting (Table 10) information shown below and on the proceeding page. If the problem cannot be remedied, please leave the unit just as it is and consult our company's business office or service plant.

TABLE 10. HYDRAULIC SYSTEM TROUBLESHOOTING

SYMPTOM

POSSIBLE PROBLEM

SOLUTION

 

 

 

 

 

Check TB1 terminal #17. If this terminal is energized when the

 

Delta "Q" compensator not de-energized

pump is turned on, the pump will not cycle because the

 

when pump is energized?

compensator is dumping controll pressure to the accumulator tank.

 

 

Check K-3 relay and replace if necessary.

 

 

 

 

Volume control not turned open?

Turm volume control valve counter-clockwise to open.

No hydraulic oil flow from axial piston

 

 

 

 

pump.

Hydraulic oil level low?

Fill resevouir to proper level.

 

 

 

 

 

Restricted suction screen?

Clean suction screen.

 

 

 

 

Main pressure relief valve open

Remove cartridge. Clean and reset. Replace cartridge if

 

ncessisary.

 

 

 

 

 

 

 

This emergency cycle switch, located in the control box, can be

 

Proximity switch is not sending a signal?

used to determine which switch is faulty. Determine malfunctioning

 

 

proximity switch and replace.

 

 

 

 

 

Turn on pump switch. Check TB1 terminal #35 and #36 to

 

Pilot cycle valve malfunction?

determine if current is flowing to valve. Check detents in valve for

Drive cylinders will not cycle

 

proper operation.

 

 

 

 

K-4 relay faulty?

Check the proximity switch enclosure.

 

 

 

 

Main cycle valve(manifold) faulty?

Check spool or centering springs. Replace or repair as necessary.

 

 

 

Accumulator pressure drops to zero

Low nitrogen charge in accumulator

Re-charge accumulator bladder with nitrogen to 1100 PSI.

on every cycle

bladder?

 

 

 

 

Accumulator pressure is below 1750

Unloading valve setting too low?

Adjust unloading valve until 1750 PSI is reached.

PSI.

 

 

 

 

 

Accumulator pressure is not

Cartridge at port 4-D on manifold block

Check solinoid and cartridge. Replace if necessary

discharging when switch is turned off

is not working?

 

 

 

 

PAGE 62 — MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04)

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Multiquip ST-45HRM manual ST-45 Pump -TROUBLESHOOTING Hydraulic System, Hydraulic System Troubleshooting
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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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