Key installation points for Rexroth A4VG_32 series piston pumps

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Series: Rexroth piston pump A4VG_32 Series; Specifications: 28, 40, 56, 71, 90, 125, 180, 250. Operating pressure: Nominal pressure of 40 MPa, peak pressure of 45 MPa. Control type: NV type, without control device; DG – hydraulic control, direct control type; EZ – electrical two-point control, with switch solenoid; HD – hydraulic control, dependent on pilot pressure; HW – hydraulic control, mechanical servo type; EP – electrical control, with proportional solenoid; DA – hydraulic control, dependent on reduction ratio. Features: ◆ Swashplate-type axial piston variable pump, used for closed-loop hydrostatic transmission. ◆ Flow rate is proportional to drive speed and displacement, and can be varied continuously； ◆The flow rate increases from zero to its maximum value as the swash plate angle increases ； ◆Swinging the swash plate past the neutral position allows for a smooth change in the direction of fluid flow ； ◆Multiple variable options that can be easily integrated with various control and regulation systems ； ◆The pump is equipped with two relief valves on the high-pressure oil side to protect the hydrostatic drive (pump and motor) from overload ； ◆The high-pressure relief valve also serves as an oil replenishment valve ； ◆The built-in auxiliary pump is used as an oil replenishment pump and a control pump ； ◆The maximum refueling pressure is limited by a built-in refueling relief valve ； ◆The entire series is equipped with a built-in pressure cut-off valve ； Safety instructions: - The A4VG pump is designed for use in closed circuits. - The project planning, installation, and commissioning of axial piston units must be carried out by qualified personnel. - Before using the axial piston unit, please read the corresponding instruction manual thoroughly. It can be obtained from Bosch Rexroth if necessary. - During operation and shortly after, the axial piston unit (especially the electromagnet) may pose a risk of burns. Appropriate safety measures should be taken (such as wearing protective clothing). - The characteristics of the axial piston unit can change depending on different operating conditions (operating pressure, oil temperature). - Working line oil port: · The oil port and fixing thread are designed for the maximum specified pressure. Machine or system manufacturers must ensure that the safety factors of the connecting components and pipelines meet the specified operating conditions (pressure, flow rate, hydraulic oil, temperature). · The working line oil ports and functional oil ports are used only for hydraulic lines. - The data and instructions contained here must be followed. - This product cannot be approved as a component that adheres to the general mechanical safety concept of ISO 13849. - Use the following tightening torques: Joints: For the tightening torque of the joints used, please refer to the manufacturer’s instructions. · Mounting bolts: For mounting bolts with ISO metric threads in accordance with DIN 13 standards and threads in accordance with ASME B1.1 standards, we recommend checking the tightening torque for each housing according to VDI 2230. · Threaded hole of the axial plunger unit: The maximum allowable tightening torque MG max applies to internal threaded holes, and this value must not be exceeded. · Locking screw: For the metal locking screw provided with the axial piston unit, the tightening torque MV required for the locking screw shall be used.