Bosch Rexroth | AA10VO85DFR52L-VUC61N00
AA10VO85DFR/52L-VUC61N00
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The AA10VO85DFR/52L-VUC61N00 variable pump belongs to the A10VSO Variable Pumps series manufactured by Bosch Rexroth for hydraulic automation where adjustable flow and pressure are required. Its DFR pressure-flow control varies displacement according to demand, and the standard control differential is 200 psi (14 bar) to stabilize circuit pressure. A continuous nominal rating of 4000 psi (280 bar) supports most working cycles, while a peak limit of 5100 psi (350 bar) tolerates short overloads. Flow is directed from port S to port B so line routing must match this path, and the shaft turns counterclockwise to align with left-hand prime movers. All service ports face the rear under Version 61, allowing the pump to mount flush against a manifold. Cavitation is avoided because the inlet requires at least 0.8 bar absolute, and hydraulic oil may reach 115 °C without degrading performance.
The housing can be vented only to 2 bar absolute case-drain pressure, protecting shaft seals and bearings from excess load. Pilot oil consumption is limited to 0.8 gpm (3 L/min), which minimizes auxiliary flow requirements in the control loop. The design accepts very thick oil during startup, handling viscosities up to 1600 cSt, while short-term operation is still safe at 10 cSt for low-viscosity fluids. Cleanliness must reach ISO 4406 20/18/15 so internal surfaces remain free of particle wear. FKM sealing material withstands the specified temperature range and common hydraulic media. Because there is no through drive, indicated by code N00, the pump cannot transmit mechanical power to downstream attachments, which simplifies installation and reduces overall length.
Technical Specifications
Case Drain Pressure (max, Abs)
2 bar
Cleanliness Class (min)
ISO 4406 20/18/15
Control Type
DFR (Pressure-Flow)
Dfr Δp Standard
200 psi (14 bar)
Flow Direction
S to B
Fluid Temperature (max)
115 °C
Inlet Pressure (min, Abs)
0.8 bar
Nominal Pressure
4000 psi (280 bar)
Peak Pressure
5100 psi (350 bar)
Pilot Oil Consumption (max)
0.8 gpm (3 L/min)
Ports Orientation
Rear (Version 61)
Rotation
Counterclockwise (L)
Seal Material
FKM (V)
Through Drive
None (N00)
Viscosity (max, Cold Start)
1600 cSt
Viscosity (min, Short-term)
10 cSt
1620 Old Apex Road
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