R902482660 A10VSO71DR/31R-VPA42N00 Piston pump from Rexroth, Germany

The DR is a Pressure Compensator. It automatically reduces the pump's displacement (destrokes) when the system pressure reaches the preset value. This maintains constant pressure while minimizing energy consumption and heat generation.

This code defines the mechanical configuration:

• V: FKM (Viton) seals for high temperature and chemical resistance
• P: Tapered shaft (1:5) with a parallel key
• A42: Port size code 42 (SAE flange ports with UNC threads)
• N00: No through-drive (solid shaft end)

The primary difference is the displacement size:

• A10VSO71: 71 cm³/rev, providing higher flow output (~156 L/min vs ~117 L/min at same speed)
• A10VSO45: 45 cm³/rev, smaller size for lower flow requirements

This model uses a simpler DR pressure control, whereas the previous ones used DFR1 (pressure + load sensing).

The L Port (Case Drain) must be connected directly to the tank. It relieves internal leakage pressure to protect the shaft seal. Maximum allowable backpressure is typically 2 bar.

No. The A10VSO DR is designed exclusively for open-circuit applications (pump → valve → actuator → tank). For closed-loop hydrostatic transmissions, you would need an A4VG or A2FM series unit.