Bosch Rexroth | AA10VO28DFR-31L-VSC62N00
AA10VO28DFR /31L-VSC62N00
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The AA10VO28DFR /31L-VSC62N00 variable pump belongs to the A10VSO Variable Pumps series and is manufactured by Bosch Rexroth for controlled oil delivery in hydraulic automation. A displacement of 28 cm³/rev (1.71 in³/rev) sets the theoretical volume moved each shaft revolution, while a flow of 13.2 gpm at 1800 rpm shows expected output in common drive arrangements. The unit can reach 22.2 gpm at its rated maximum speed, giving headroom for higher demand cycles. Counter-clockwise rotation defines the necessary motor coupling direction. A top speed of 3000 rpm at full displacement limits mechanical stress during continuous service. The nominal pressure rating of 4000 psi (280 bar) establishes routine operating conditions, and a peak rating of 5100 psi (350 bar) allows short-term pressure spikes without damage. A weight of 33 lb (15 kg) informs mounting design and handling requirements.
The case drain pressure is limited to 29 psi (2 bar) so internal leakage oil can return to tank without overloading shaft seals. A DFR differential pressure setting of 200 psi (14 bar) provides a reference for the pump’s compensator function. Flow moves from port S to port B, clarifying circuit layout. The inlet port follows SAE J518 1 1/4 in dimensions to accept reservoir lines sized for the stated flow rates, and the pressure port uses SAE J518 3/4 in to connect to system piping. Maximum absolute inlet pressure is 435 psi (30 bar), preventing cavitation during elevated tank pressures. Control oil enters through pilot port X with a 7/16-20 UNF-2B thread, offering a standard interface for remote actuation. When the displacement is reduced below maximum, the shaft may run up to 3600 rpm, giving faster response for variable-speed drives.
Technical Specifications
Case Drain Pressure (abs) Max
29 psi (2 bar)
Dfr Differential Pressure Standard
200 psi (14 bar)
Direction Of Flow
S to B
Direction Of Rotation
Counter-Clockwise
Displacement
28 cm³/rev (1.71 in³/rev)
Flow (at 1800 Rpm)
13.2 gpm
Inlet Port Size
SAE J518 1 1/4 in
Inlet Pressure (abs) Max
435 psi (30 bar)
Max Flow (at Nmax)
22.2 gpm
Max Speed (at Vg < Vg Max)
3600 rpm
Max Speed (at Vg Max)
3000 rpm
Nominal Pressure
4000 psi (280 bar)
Peak Pressure
5100 psi (350 bar)
Pilot Port X Thread
7/16-20 UNF-2B
Pressure Port Size
SAE J518 3/4 in
Weight
33 lb (15 kg)
1620 Old Apex Road
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