Rexroth series A4VTG90 charge pump

Rexroth series A4VTG90 charge pump

5 month ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 4 year year

Product details

1. Product Overview

TheRexroth A4VTG90 series charge pumpis ahigh-pressure gear pumptypically used as an auxiliary oil supply unit for main pumps (e.g., A4VTG90 axial piston pumps) in closed-loop hydraulic systems. Its primary functions include:

• Replenishing system leakageto maintain oil balance.

• Providing control pressurefor servo mechanisms or control valves of variable-displacement pumps.

• Cooling and lubricationby circulating oil to reduce system temperature and lubricate moving components.

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2. Technical Specifications

• Model: A4VTG90 (suffixes like HW/EP indicate control type)

• Displacement: Typically18.7 cm³/r(auxiliary pump) or25.7 cm³/r(model-dependent).

• Rated Pressure:40 MPa (400 bar); maximum pressure up to45 MPa (450 bar).

• Speed Range:

• Continuous:≤3,050 rpm

• Maximum (short-term):≤3,300 rpm

• Drive Method: Coaxial drive with the main pump (via coupling or spline).

• Structure:External gear pumpwith cast iron housing and double-lip nitrile rubber seals.

• Control Types:

• HW: Hydraulic-mechanical proportional control.

• EP: Electro-hydraulic proportional control (with emergency manual reset).

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3. Structural Features

1. Integrated Design:

• Shares housing with the main pump (e.g., A4VTG90 axial piston pump) for compactness.

• Built-in charge pump, control valves, and pressure cutoff valve to reduce system complexity.

2. High Reliability:

• Gears made of high-quality powder metallurgy for wear resistance.

• Bearings (SF-1 oil-free or needle bearings) ensure long service life.

3. Low Noise:

• Optimized gear parameters reduce operational noise (typically ≤70 dB).

4. Easy Maintenance:

• Modular design allows replacement of wear parts (e.g., seals, bearings) individually.

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4. Working Principle

The charge pump uses a pair of meshing gears to draw oil from the suction port and pressurize it into the system:

1. Suction Phase: Gears disengage, increasing volume to create a vacuum and draw in oil.

2. Discharge Phase: Gears engage, decreasing volume to pressurize and expel oil.

3. Oil Distribution: Pressurized oil is directed to the main pump’s servo mechanism or returned to the tank via a cooler.

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5. Applications

1. Construction Machinery:

• Concrete mixer trucks (closed-loop drive for mixing drums).

• Road rollers (vibration motor oil supply).

• Excavators (travel motor charge pump).

2. Industrial Equipment:

• Hydraulic test benches, injection molding machines, die-casting machines requiring high-pressure charge oil.

3. Specialized Fields:

• Marine steering gears, wind turbine yaw drives, and other systems demanding high reliability.

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6. Common Faults & Troubleshooting

【表格】

Fault Symptom Possible Causes Solutions

Insufficient flow Clogged suction filter, worn gears, low oil level Clean filter, replace gears, replenish oil

Pressure fluctuation System leakage, faulty charge pump relief valve Check pipe seals, adjust/replace relief valve

Abnormal noise Poor gear meshing, damaged bearings, air ingestion Replace gears/bearings, check suction line seal

Overheating Excessive charge flow, inefficient cooler Adjust pump displacement, clean/replace cooler

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7. Selection & Installation Guidelines

1. Selection Tips:

• Match charge pump displacement to main pump (e.g., 18.7 cm³/r for A4VTG90).

• Ensure system pressure ≤ charge pump’s rated pressure (40 MPa).

2. Installation Notes:

• Position suction port below oil level to prevent cavitation.

• Align coupling with ≤0.1 mm runout to minimize vibration.

• Perform a dry run before startup to confirm rotation direction matches label.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 Audited supplier

4 year

Address: Ningbo, China

Main Product: hydraulic motor , gear box, hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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