Bosch Rexroth | AA2FM25060W-VSD527F-SO103
AA2FM250/60W-VSD527F-SO103
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The AA2FM250/60W-VSD527F-SO103 belongs to the A2FM Fixed Motors series from Bosch Rexroth and serves as a fixed-displacement axial piston motor for hydraulic automation systems that require dependable rotary output. Its displacement of 250 cm³ per revolution defines the fluid volume consumed each cycle, influencing pump sizing and circuit flow. At a nominal speed of 2700 rpm the motor draws 675 l/min, matching high-flow applications such as propel drives. Continuous operation is supported at 350 bar nominal pressure, where the motor develops 1393 Nm of torque to move heavy mechanical loads. A 1 1/4 in SAE J518 working port accommodates large-diameter hoses to keep pressure losses low, while the rotating group moment of inertia of 0.061 kg·m² affects acceleration response. The complete assembly weighs 73 kg, which must be considered when selecting mounting hardware and frame supports.
A case volume of 2.5 l provides internal oil capacity for thermal management and pressure equalization. Leakage oil exits through an M22×1.5 drain port to prevent case over-pressure, and a recommended flushing flow of 10 l/min passes through a separate M14×1.5 port to remove heat and particles. The design permits intermittent speeds up to 3000 rpm, giving headroom for short-term overspeed during load variations. Maximum pressure is rated at 400 bar, while the high-pressure side must stay above 25 bar so hydrostatic bearings remain stable. A total differential limit of 700 bar protects the housing against extreme transients. These pressure and connection parameters allow the motor to operate reliably in closed-loop hydrostatic drives that demand consistent high power and controlled thermal conditions.
Technical Specifications
Case Volume
2.5 l
Displacement (per Rev)
250 cm³
Drain Port Size
M22×1.5
Flushing Flow (recommended)
10 l/min
Flushing Port Thread
M14×1.5
Inlet Flow At Nnom
675 l/min
Max Speed (intermittent)
3000 rpm
Maximum Pressure
400 bar
Min High-pressure Side
25 bar
Moment Of Inertia
0.061 kg·m²
Nominal Pressure
350 bar
Nominal Speed
2700 rpm
Torque At Pnom
1393 Nm
Total Pressure Limit
700 bar
Weight
73 kg
Working Port Size
1 1/4 in (SAE J518)
1620 Old Apex Road
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