Bosch Rexroth | AA10VO85DFR52R-VUC61N00
AA10VO85DFR/52R-VUC61N00
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The AA10VO85DFR/52R-VUC61N00 pump is produced by Bosch Rexroth and belongs to the A10VSO Variable Pumps series. Designed for hydraulic automation, it is an axial piston, variable displacement unit intended for open-circuit service where precise flow adjustment is required. A DFR pressure-flow control device modulates displacement, with a pressure setpoint that can be raised to 4,100 psi (280 bar) and a differential pressure reference of 200 psi (14 bar) to maintain stable flow under varying load. The housing, rotating group, and port block are rated for a nominal operating pressure of 4,000 psi (280 bar) and can tolerate peak excursions to 5,100 psi (350 bar) during short transients. Rotation is clockwise, and internal galleries route oil from port S to port B, matching standard mobile circuit layouts. Installation uses an SAE J744 mounting flange, and the rear-facing 61 N00 port arrangement omits a thru-drive to keep the package compact.
System interface requirements center on fluid quality and inlet conditions. The pump accepts inlet absolute pressures between 12 psi (0.8 bar) and 435 psi (30 bar), allowing operation with flooded or boosted supply lines. Two case-drain ports are provided, and the return line must remain below 29 psi (2 bar) absolute to prevent shaft-seal overload. Oil contamination must not exceed ISO 4406 class 20/18/15 so that the swashplate bearings achieve full service life. Continuous operation is permitted with fluid temperatures up to 115 °C, enabling use in high-ambient or heavily loaded machines. Hydraulic fluid flows through the selected drain port to remove heat and air before it reenters the reservoir, and dual ports give flexibility when routing hoses in confined spaces. These inlet, temperature, and cleanliness limits allow the pump to deliver the commanded displacement accurately across its full control range without cavitation or excessive wear.
Technical Specifications
Case Drain Abs Pressure Max
29 psi (2 bar)
Case Drain Ports
2
Control Device
DFR Pressure-Flow Control
Dfr Diff. Pressure Std
200 psi (14 bar)
Direction Of Flow
S To B
Direction Of Rotation
Clockwise (R)
Fluid Cleanliness Min
ISO 4406 20/18/15
Inlet Abs Pressure Max
435 psi (30 bar)
Inlet Abs Pressure Min
12 psi (0.8 bar)
Max Fluid Temperature
115 °C
Mounting Flange Standard
SAE J744
Nominal Pressure
4000 psi (280 bar)
Peak Pressure
5100 psi (350 bar)
Port Configuration
61 N00 (Rear, No Thru-Drive)
Pressure Setpoint Max (dfr)
4100 psi (280 bar)
Pump Type
Axial Piston, Variable, Open Circuit
1620 Old Apex Road
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