A4VG Series 180cc Axial Piston Variable Hydraulic Pump for Closed Circuit Mobile Machinery

Key Features

1. EP4 electric control version, precise signal control, fast response

2. Built-in auxiliary charge pump for make-up oil & pilot supply

3. Integrated high pressure relief valves to protect hydraulic system

4. Modular design, easy maintenance and interchangeable replacement

5. Low noise, high efficiency, long service life

6. High strength cast iron housing, wear-resistant piston assembly

7. Can be used with mineral hydraulic oilTechnical Parameters

Technical Parameters

Specifications:

Application Scenarios

· Large crawler excavator

· Road roller

· Asphalt paver

· Crawler carrier

· Mobile drilling rig

· Other heavy closed-loop hydrostatic drive construction machinery

· Concrete mixer truck

· heavy-duty mobile hydraulic transmission system

Competitive Advantage:

1. Equipped with EP electric proportional variable mechanism, it adjusts pump displacement precisely through electric signals, with controllable flow and power response. It is convenient for PLC automatic control of complete machine. It can match output power in real time according to load, improve equipment control accuracy, and meet the automatic operation requirements of large mobile construction machinery.

2. 180cc displacement closed-circuit piston pump with high rated working pressure, continuously outputs high torque power and has excellent overload and impact resistance. Compact structure and high power density, suitable for the limited hydraulic installation space of heavy mobile equipment such as large excavators and concrete machinery.

3. The core friction pairs adopt high-strength wear-resistant materials, which can withstand alternating impact loads on construction sites and operate stably for a long time under harsh conditions with dust and large temperature difference. Original and replacement spare parts are maturely supplied in the market, easy for maintenance and disassembly, reducing equipment downtime losses.

The Analysis For Rexroth A4VG Piston Pump Common Breakdown:

1. Insufficient pump output flow and slow, weak equipment movement. Wear of pistons and cylinder block or scratches on the valve plate cause increased internal leakage, and the pump cannot reach the rated flow. It directly slows down the actuators of large excavators and concrete machinery and reduces operating efficiency. The problem of insufficient power becomes more obvious under heavy load.
2. Abnormal noise and violent vibration of pump body. The main inducing factors are contaminated hydraulic oil, air entering the suction pipeline or main bearing wear. Impurities and cavitation continuously scour internal precision parts. Vibration and noise keep intensifying. Long-term operation will damage internal components, and the pump core may seize in severe cases, causing machine shutdown.
3. EP electric proportional control failure and abnormal displacement adjustment. Damage to proportional electromagnet, stuck control spool or circuit fault will prevent the EP variable mechanism from receiving electric signals to adjust displacement. The system flow cannot change with instructions, resulting in out-of-control power output and large pressure fluctuation, affecting automatic operation of equipment.