R902520808 AA10VS0140DRS/32R-VPB22U00E Rexroth Germany made variable piston pump

R902520808 AA10VSO140DRS/32R-VPB22U00E - Variable Axial Piston Pump

FAQ - Frequently Asked Questions

Q1: What is the key difference between DR and DRS control?

A:​ Both are pressure controls (constant pressure). The DR​ control is adjusted mechanically via a screw on the pump cover. The DRS​ control allows for remote hydraulic adjustment​ via an external pilot pressure signal connected to port X. This lets you change the pump's pressure setting remotely using a proportional valve or a manual relief valve.

Q2: How do I set up the remote pressure control (DRS)?

A:​ Connect an external pressure source (e.g., from a hand pump or a proportional reducing valve) to port X​ on the pump control cover. The pressure at port X will determine the pump's cutoff pressure. Ensure the control pressure line is clean and free of leaks to avoid erratic pump behavior.

Q3: What are the port connections (VPB22)?

A:​ VPB22​ indicates SAE flanged ports with metric screws and a 22 series port plate. This pump has three main ports:

• S (Suction): Connect to reservoir.

• P (Pressure): Connect to system.

• L (Case Drain): One of the two drain ports must be connected directly to the tank with zero backpressure; the other must be plugged.

Q4: Can I add a gear pump to the back of this unit?

A:​ No.​ The code U00​ indicates a standard shaft with no through-drive capability. The shaft does not protrude from the rear housing to drive an auxiliary pump. If you need a multi-pump configuration, you must select a version with a through-drive code (e.g., K01, K02).

Q5: Why are there two case drain ports?

A:​ The pump has two case drain ports for installation flexibility. You must connect only one​ of them directly to the tank (reservoir). The second port must be plugged. The drain line must have zero backpressure​ (max 0.5 bar) to prevent damage to the shaft seal.

Q6: What is the recommended operating speed?

A:​ The standard nominal speed for the A10VSO 140 size is 1500 – 1800 rpm. While the maximum speed may be listed as 2050-2100 rpm, running at higher speeds requires excellent suction conditions (pressurized inlet) and may reduce service life.

Q7: What does the "V" in the code mean for seals?

A:​ V​ stands for FKM (Viton)​ seals. This is suitable for a wider range of fluids, including certain biodegradable oils (HEES) and high-temperature applications. If you are using standard mineral oil, NBR (code 'P') is also acceptable, but 'V' offers better chemical resistance.