R902520809 AA10VS071DRS/32R-VPB22U00E-S2183 German Rexroth Piston Pump
| Order Number |
R902520809 |
| Model |
AA10VSO71DRS/32R-VPB22U00E-S2183 |
| Type |
Variable displacement axial piston pump (swashplate design, open circuit) |
| Nominal Displacement |
71 cm³/rev |
| Control Type |
DRS (Pressure & Flow Control / Load Sensing) |
| Pressure Rating |
280 bar (Continuous)
350 bar (Peak, intermittent) |
| Speed Range |
1000 - 1800 rpm (Recommended)
Max. speed typically 2200 - 2400 rpm (limited by inlet conditions) |
| Rotation Direction |
Right-hand (R) (viewed from shaft end) |
| Shaft Type |
Splined shaft (SAE J744) |
| Port Connection |
VPB22U (SAE flange with metric threads, with through-drive) |
| Mounting Flange |
ISO 3019-2 (Series 32) |
| Seal Material |
NBR (Standard for mineral oil) |
| Suitable Media |
Mineral oils (HL, HLP), HLP-D, HVLP, HFC fluids |
| Media Temperature |
-20 °C to +80°C (Start-up viscosity < 1000 mm²/s) |
| Recommended Viscosity |
16 - 68 mm²/s (ISO VG 32-68) |
| Cleanliness Requirement |
ISO 4406 20/18/15 or better |
| Weight |
Approx. 47 - 52 kg |
Frequently Asked Questions
What is DRS control, and how does it work?
DRS is a combined
pressure-flow control with load sensing (LS).
- Pressure Control: Limits system pressure to a set maximum (like a DR control)
- Flow Control (LS): The pump automatically adjusts its swashplate angle to deliver only the flow required by the actuators, maintaining a constant pressure differential (Δp) across the control orifice. This results in significant energy savings compared to constant flow pumps
Can I mount an additional pump on the back?
Yes. The code VPB22U indies this pump has a through-drive shaft (through-drive). You can mount a second pump (e.g., a gear pump for pilot flow or a second circuit) directly onto the back flange of this unit.
What are the critical installation precautions?
- Case Drain (L port): Must be connected separately to tank with minimal backpressure (max 2-3 bar). Do not tee it into the main return line. This is critical for flushing heat and preventing seal/bearing failure
- Suction Conditions: Ensure inlet pressure at port S is ≥ -0.8 bar (absolute) to avoid cavitation. Use short, large-diameter suction lines
- Rotation: Confirm motor rotation matches the pump's "R" (clockwise) designation. Running backwards can destroy the pump
Why is my pump noisy or overheating?
- Noise: Usually caused by cavitation. Check suction filter, inlet line for leaks, or oil viscosity being too high at startup
- Overheating: Often due to excessive case pressure (blocked or undersized case drain line) or operating for long periods at high pressure with small displacement (high power loss)
How do I adjust the pressure setting?
The DRS control has a pressure limiter screw (usually under a cap on the control housing).
Always adjust under controlled conditions with a pressure gauge:
- Loosen the locknut
- Turn the screw clockwise to increase pressure, counterclockwise to decrease
- Tighten the locknut and re-check the setting
Is an external relief valve still needed?
Yes. While the DRS control limits pressure, it is not a safety valve. You must install a separate system relief valve (e.g., a DB/DBW type) in the main line as a safety backup against control failure.
What is the difference between DR and DRS?
- DR: Only pressure control (constant pressure variable pump)
- DRS: Pressure control + Load Sensing. DRS adds the ability to match flow to demand, which is more energy-efficient for systems with varying flow requirements
Disclaimer: For precise installation and commissioning, always refer to the official Rexroth technical data sheet RE 25700 for A10VSO Series 32 pumps.
