Bosch Rexroth | AA10VO28DFR152L-VSC64N00
AA10VO28DFR1/52L-VSC64N00
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The AA10VO28DFR1/52L-VSC64N00 variable pump belongs to the A10VSO Variable Pumps series produced by Bosch Rexroth for closed-loop hydraulic circuits in automated machinery. With a displacement of 28 cm³ per revolution, it supplies controlled fluid volume to actuators. The pump supports continuous operation at a nominal pressure of 4000 psi, while momentary loads can reach a peak of 5100 psi for short duty cycles. At 1800 rpm and full displacement it delivers 13.2 gpm, providing stable flow for medium-size systems. The inlet port requires an absolute pressure of at least 12 psi to prevent cavitation, and the case drain line must not exceed 29 psi to protect shaft seals. A differential pressure setting of 200 psi in the DFR1 control keeps the swashplate adjusted for load-sensing circuits. Internal oil reserve equals 0.18 gal, ensuring adequate lubrication of rotating groups during startup.
When speed increases to the maximum rated value, the pump supplies up to 22.2 gpm, covering demands of fast-moving cylinders. Flow regulation remains precise because deviation between DFR and DFR1 controls is limited to 0.26 gpm. The rotating assembly can run at 3600 rpm when the swashplate is below maximum displacement, or 3000 rpm when set to full stroke, allowing designers to balance speed and flow. Swashplate adjustment reacts in 40 ms at 4000 psi, so system pressure spikes are minimized. Output torque reaches 33 lb-ft at 1450 psi and rises to 91 lb-ft at 4000 psi, data useful for sizing drive motors and couplings. Dry weight of the unit is 33 lb, which aids mounting on mobile or stationary frames without heavy lifting equipment.
Technical Specifications
Case Drain Abs Pressure Max
29 psi (2 bar)
Case Volume (filling)
0.18 gal (0.7 L)
Dfr1 Differential Pressure Setting
200 psi (14 bar)
Displacement
28 cm³/rev
Flow At 1800 Rpm (vg Max)
13.2 gpm (50 L/min)
Inlet Abs Pressure Min (port S)
12 psi (0.8 bar)
Max Flow At Nmax (vg Max)
22.2 gpm (84 L/min)
Max Flow Deviation (dfr/dfr1)
0.26 gpm (1.0 L/min)
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)
Stroking Time At 4000 Psi (dfr1)
40 ms
Torque At 1450 Psi (vg Max)
33 lb-ft (45 Nm)
Torque At 4000 Psi (vg Max)
91 lb-ft (125 Nm)
Weight (without Fluid)
33 lb (15 kg)
1620 Old Apex Road
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