Audited Supplier
We produce and supply Original Brueninghaus Hydromatik Rexroth Axial Piston Variable Pump Model: A4VG28 A4VG40 A4VG56 A4VG71 A4VG90 A4VG125 A4VG180 A4VG250 A4VG pump, and 2500889 2613629 2899657 2896388 1414126 2501902 2221214 1836129 1295348 2498572 1367701 1398897 2784437 1809997 Cat Hydraulic Pump
Features below:
1. Variable axial piston pump of swash plate design for hydrostatic closed circuit transmissions
2. Flow is proportional to drive speed and displacement and is infinitely variable
3. Output flow increases with the swivel angle of the swash plate from 0 to its maximum value
4. Flow direction changes smoothly when the swash plate is moved through the neutral position
5. A wide range of highly adaptable control devices is available for different control and regulating functions
6. The pump is equipped with two pressure-relief valves on the high pressure ports to protect the hydrostatic transmission
(pump and motor) from overload
7. The high-pressure relief valves also function as boost valves
8. The integrated boost pumps acts as a feed and control oil pump
9. The maximum boost pressure is limited by a built-in boost pressure relief valve
10. The integral pressure cut-off is standard.
Details regarding the choice of hydraulic fluid
The correct choice of hydraulic fluid requires knowledge of the operating temperature in relation to the ambient temperature: in
a closed circuit the circuit temperature. The hydraulic fluid should be chosen so that the operating viscosity in the operating temperature range is within the optimum range (νopt) - the shaded area of the selection diagram. We recommended that the higher viscosity class be selected in each case. Example: At an ambient temperature of X °C an operating temperature of 60 °C is set. In the optimum operating viscosity range (νopt; shaded area) this corresponds to the viscosity classes VG 46 or VG 68; to be selected: VG 68. Please note: The case drain temperature, which is affected by pressure and speed, is always higher than the circuit temperature. At no point in the system may the temperature be higher than 115 °C. If the above conditions cannot be maintained due to extreme operating parameters, please consult us.
Hydraulic fluid
Before starting project planning, please refer to our data sheets RE 90220 (mineral oil), RE 90221 (environmentally acceptable hydraulic fluids) and RE 90223 (HF hydraulic fluids) for detailed information regarding the choice of hydraulic fluid and application conditions. The variable pump A4VG is unsuitable for operation with HFA, HFB and HFC. If HFD or environmentally acceptable hydraulic fluids are being used, the limitations regarding technical data and seals mentioned in RE 90221 and RE 90223 must be observed. When ordering, please indicate the used hydraulic fluid.
