A4VG series closed circuit variable displacement pump

– Variable displacement axial piston pump of swashplate design for hydrostatic closed circuit transmissions

– Flow is proportional to drive speed and displacement and is infinitely variable

– Output flow increases with swivel angle from 0 to its maximum value

– Swivelling the pump over centre smoothly changes the direction of flow

– Availability of a highly adaptable range of control and regulating devices

General

The pump housing must be filled with hydraulic fluid prior to commissioning and remain full when operating.

Commissioning should be carried out at low speed and with no load until all air has been bled from the system.

If the pump is idle for extended periods, the housing may drain via the service lines. It is important to refill the housing sufficiently before putting the pump back into operation.

Leakage fluid in the housing space should be sent to the tank via the highest leakage oil port. Ensure a minimum suction pressure at port S of 0,8 bar abs. (cold start 0,5 bar absolute).

– The pump A4VG is designed for application in closed circuits.

– Layout, assembly, startup and operation of the pump requires sufficiently trained staff.

– The service and operating ports are only designed for the connection of hydraulic lines.

– Tightening torques: Do not exceed the max. permissible tightening torque of the fittings used, see manufacturer’s specifications. For fixing screws conforming to DIN 13, we recommend to verify the tightening torque in each individual case in accordance with VDI 2230, edition 2003.

– During and shortly after operation of the pump, the solenoids are extremely hot: do not touch - risk of burns.