REXRTOH Axial piston variable pump A4VG Series 40

Product Overview and Core Positioning

The A4VG Series 40 is a high-pressure inclined disc axial piston variable displacement pump launched by Bosch Rexroth, designed specifically for closed-loop hydraulic systems. Its core advantages are high power density and stable high-pressure performance. Its rated pressure reaches 450 bar, and the maximum pressure can reach 500 bar (single working time ≤ 10s, total working time ≤ 300h), suitable for scenarios such as machine tools, construction machinery, industrial transmission, etc. that require high-pressure power output. The product integrates a built-in auxiliary pump, which can provide pressure compensation and pilot oil supply, while supporting multiple control modes and expansion functions, with strong flexibility.

Core specifications and technical parameters

Key dimensions and displacement | Specification (NG) | Main pump displacement (cm ³/rev) | Auxiliary pump displacement (standard/large, cm ³/rev) | Weight (without through drive, kg) | Maximum speed (rpm)|

| 110 | 110.4 | 24.5/31 | 88 | 3150 |

| 125 | 125 | 31/- | 84 | 3000 |

| 145 | 145.3 | 32/39 | 106 | 2850 |

| 175 | 175.4 | 39/47 | 115 | 2650 |

| 210 | 210.6 | 46/60 | 152 | 2500 |

| 280 | 280.3 | 60/- | 160 | 2400 |

Hydraulic oil and environmental parameters

Recommended hydraulic oil: HLP mineral oil (DIN 51524), also compatible with environmentally friendly and fire-resistant hydraulic oil (please refer to the corresponding data manual).

Viscosity requirement: Continuous operation at 10-400 mm ²/s (optimal at 36-16 mm ²/s), cold start at ≤ 1600 mm ²/s (duration ≤ 3 minutes).

Temperature range: working temperature of hydraulic oil NBR seal ≤ 85 ℃, FKM seal ≤ 110 ℃; Storage and transportation temperature -30~+85 ℃.

Cleanliness requirements: ISO 4406 20/18/15, viscosity<10 mm ²/s needs to be increased to 19/17/14.

Control mode and functional configuration

Detailed Explanation of Mainstream Control Methods | Control Types | Model Codes | Core Features | Power Supply/Signal Requirements|

|Hydraulic proportional control (related to pilot pressure) | HP1/HW2/HW8 | Flow rate is continuously adjustable from 0-100%, proportional to pilot pressure (6-18 bar) | Hydraulic pilot signal|

|Mechanical servo control | HW series | Adjust flow rate through control rod swing angle, with spring centering | Mechanical force (maximum 170Ncm)|

|Speed related automatic control | DA1 (12V)/DA2 (24V) | Suitable for walking drive, flow rate automatically adjusts with engine speed | 12V/24V, rated power ≈ 26W|

|Electric proportional control | EP1/EP3 (12V)/EP2/EP4 (24V) | Flow proportional to control current (200-1200mA), some with manual emergency adjustment | 12V/24V, 100Hz jitter frequency|

|Electric two-point control | EZ1 (12V)/EZ2 (24V) | Only switch between "zero displacement/maximum displacement" | 12V/24V, minimum operating current 0.67-1.32A|

Core auxiliary functions

Pressure cut-off: After the pressure reaches the set value, reduce the displacement to the minimum, which should be 30 bar lower than the high-pressure relief valve to avoid frequent operation of the relief valve.

Bypass function: It can connect ports A and B (such as in towing scenarios), with a maximum towing flow rate of ≤ 30L/min.

Neutral valve: When the power is cut off, the pump torque is zero to ensure safety and adapt to safety critical scenarios.

Mechanical travel limiter: It can infinitely limit the maximum displacement and adapt to different load requirements.

Installation and maintenance requirements

Installation specifications

Installation position: Supports 12 installation methods, recommended bottom mounted (pump body below the lowest liquid level in the tank), maximum allowable suction height is 800mm.

Port connection: The working ports A/B are SAE J518 standard, and the oil suction port S and oil discharge port T1/T2 need to be connected according to the installation position (to avoid liquid accumulation).

Through drive: Supports the installation of additional pumps of the same specifications, and attention should be paid to the through drive torque (934Nm for 110NG and 2641Nm for 280NG).

Filtering and pressure compensation requirements

Oil suction filter: It is recommended to install an oil suction filter with a cold start valve. When working continuously, the oil suction pressure should be ≥ 0.8 bar absolute pressure, and when starting cold, it should be ≥ 0.5 bar absolute pressure.

Pressure compensation circuit: The rated pressure of the auxiliary pump is 25 bar, with a maximum of 40 bar. It can be equipped with built-in or external filtration (to meet cleanliness requirements).

Safety and Maintenance

Safety protection: When working, the temperature of the pump body and electromagnetic coil is high, and protective equipment should be worn; To avoid valve group jamming caused by hydraulic oil contamination, filters need to be replaced regularly.

Filling and deflation: After the first start-up or long-term shutdown, it is necessary to fill hydraulic oil and deflate it. The oil outlet should be connected to the highest position of the oil tank to avoid negative pressure.

Shelf life: The standard rust prevention period is 12 months, and can be extended up to 24 months (please specify in the order and meet the optimal storage conditions).

Expansion configuration and accessories

Sensor options

Pressure sensor: PR4 series (0-600bar), installed on MA/MB port, suitable for high pressure monitoring.

Speed sensor: DSA/DSM series, capable of monitoring pump speed and steering, non retrofit.

Swing angle sensor: Hall effect type, outputting 1-4V analog signal, suitable for displacement closed-loop control, non retrofit.

Connectors and accessories

Electromagnetic coil connector: DEUTSCH DT04-2P-EP04 (IP67/IP69K protection), without suppression diode.

Filter accessories: oil suction filter (version S), pressure filter (version D), and installed filter with pollution indicator (versions B/F).