ST-45 PUMP —TROUBLESHOOTING (ELECTRICAL 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 Electrical System Troubleshooting (Table 11) 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 11. ELECTRICAL SYSTEM TROUBLESHOOTING

SYMPTOM

POSSIBLE PROBLEM

SOLUTION

 

 

 

 

 

If the hydraulic system is in a maximum pressure condition, pull

After completion of a pumping stroke,

 

the toggle on the emergency cycle switch (located inside the

Proximity switch is not emitting a radio

control box) towards you. If the pump cycles, replace the proximity

pumping pressure gauge indicates

frequency?

switch at the lubrication box. If the pump cycles when you push

high pressure and cycle stops.

 

the toggle down, replace the proximity switch on the towing end of

 

 

 

 

the pump.

 

 

 

 

 

Use a hot jumper wire. Connect (jumper wire) to terminals #35

Emergency cycle switch does not

Faulty K-4 relay?

and #36 on terminal block #1. When contact is made between

cycle pump

these two terminals and the pump cycles. This would indicate that

 

 

 

you have a faulty K-4 relay.

 

 

 

Starter switch is activated and pump

 

Check fuse box in control panel. Replace blown fuses.

Faulty fuses?

 

does not start

Check fuse link below engine solenoid, next to batter.

 

 

 

 

 

 

Hatz engine will not continue to run

D-1 diode has failed?

Check D1 diode in control box. Replace if needed with 6 amp

after key is released

diode P/N EGG5815 or equivalent.

 

 

 

 

Hatz engine will not start

No power to TB-5, conductor #3?

Check and replace K1 relay if necessary

 

No power to magnet valve start/stop?

 

 

 

 

 

Engine runs, but no current travels to

Faulty K-2 relay?

Check and replace K-2 relay if necessary

circuits #32-47

 

 

 

 

 

When pump is turned on, engine

K-6 relay not completing the circuit?

 

 

Check and replace K-6 relay if necessary

RPM's will not increase

Open circuit at TB1-24?

 

 

 

 

 

 

The pump will not reverse when

K-5 relay failure?

Check and replace K-5 relay if necessary

operated by remote control

 

 

 

 

 

Engine oil pressure light will not

Oil pressure sending unit failure?

Check and replace sending unit if necessary

de-activate

 

 

 

 

 

 

Faulty D-2 diode?

Replace with diode 1U404-C

Battery charge light wont de-activate

 

 

Alternator not charging battery?

Check and repair/replace alternator unit.

 

 

 

 

MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 63

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Multiquip ST-45HRM manual ST-45 Pump -TROUBLESHOOTING Electrical System
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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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