ST-45HRM CE CONCRETE PUMP—TROUBLESHOOTING (HYDRAULIC

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 15) 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 15. 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 7.58 mPa (1,100

on every cycle

bladder?

PSI.)

 

 

 

Accumulator pressure is below 12.1

Unloading valve setting too low?

Adjust unloading valve until 12.1 mPa (1,750 PSI) is reached.

mPa (1750 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 68 — MAYCO ST-45HRM CE PUMP — OPERATION & PARTS MANUAL — REV. #0 (02/23/04)

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Multiquip manual ST-45HRM CE Concrete PUMP-TROUBLESHOOTING Hydraulic, Hydraulic System Troubleshooting
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ST-45HRM CE specifications

The Multiquip ST-45HRM CE is a robust and versatile machine designed for a variety of heavy-duty applications, particularly in construction and industrial settings. Known for its durability and efficiency, the ST-45HRM CE stands out due to its combination of advanced technology, user-friendly features, and powerful performance, making it an ideal choice for professionals seeking reliable equipment.

One of the main features of the ST-45HRM CE is its powerful engine. It is equipped with a high-performance diesel engine that provides exceptional reliability and fuel efficiency. This engine allows the machine to achieve high-performance levels while minimizing operational costs, making it a cost-effective solution for various jobs. Additionally, the engine meets stringent environmental regulations, ensuring compliance with the latest emission standards.

The ST-45HRM CE is designed with operator comfort and safety in mind. One of its key characteristics is the spacious and ergonomically designed operator platform that allows for easy access and enhanced visibility. The controls are intuitively placed, providing excellent maneuverability and reducing operator fatigue during long working hours. Moreover, safety features such as emergency shut-off switches and protective enclosures are built into the design, ensuring a safer working environment.

In terms of technology, the ST-45HRM CE is equipped with advanced hydraulic systems that enhance its lifting capabilities. This machine is capable of lifting loads up to 45 tons, making it suitable for heavy materials and equipment. The hydraulic system is designed for smooth operation, allowing for precise control and optimal performance in various applications, including lifting, transportation, and heavy-duty towing.

Maintenance is another consideration where the ST-45HRM CE excels. It features easy access points for routine checks and repairs, reducing downtime and operational costs associated with maintenance. The components are engineered for longevity, ensuring that the machine can withstand the rigors of continuous use in demanding environments.

Overall, the Multiquip ST-45HRM CE is a standout in its category, boasting an exceptional blend of power, efficiency, and user-centric design. With its advanced features, safety technologies, and ease of maintenance, it is ideal for professionals in construction, industrial lifting, and other heavy-duty applications, providing a reliable solution to meet their needs.
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