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The AA10VO60DFR1/52L-VWD61N00 variable pump is part of the A10VSO Variable Pumps series from Bosch Rexroth and is intended to modulate oil flow in hydraulic automation circuits. It operates at a nominal pressure of 4000 psi (280 bar), while a peak pressure limit of 5100 psi (350 bar) covers short load spikes. A load-sensing DFR1 differential pressure setting of 200 psi (14 bar) supports automatic displacement control under varying demands. Suction conditions are governed by an absolute inlet pressure window that starts at 12 psi (0.8 bar) and reaches 435 psi (30 bar). Flow is directed from port S to port B, clarifying circuit layout, and the ports are positioned at the rear to simplify manifold mounting.
Service parameters specify that case drain pressure must remain below 29 psi (2 bar) to protect shaft seals. The unit accepts hydraulic fluids with viscosities between 10 mm²/s and 1600 mm²/s for short periods, allowing start-up in cold oil and continued running in warmed conditions. Maximum fluid temperature is 239 °F (115 °C), so heat exchangers must be sized accordingly. ISO 4406 cleanliness class 20/18/15 is required to limit particle-induced wear and maintain regulator accuracy.
Case Drain Pressure Max
29 psi (2 bar)
Dfr1 Differential Pressure (std)
200 psi (14 bar)
Direction Of Flow
S To B
Fluid Cleanliness (iso 4406)
20/18/15
Fluid Temperature Max
239 °F (115 °C)
Inlet Pressure (abs) Max
435 psi (30 bar)
Inlet Pressure (abs) Min
12 psi (0.8 bar)
Nominal Pressure
4000 psi (280 bar)
Peak Pressure
5100 psi (350 bar)
Port Orientation
Ports At Rear
Viscosity Max (short Term)
1600 mm2/s
Viscosity Min (short Term)
10 mm2/s
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