Bosch Rexroth | AA4VG56EP4D132R-NSC52F005DH
AA4VG56EP4D1/32R-NSC52F005DH
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The AA4VG56EP4D1/32R-NSC52F005DH variable pump belongs to the AA4VG Variable Pumps series and is manufactured by Bosch Rexroth for hydraulic automation where adjustable flow is required. Its displacement is 56 cm³ per revolution, setting the base volume delivered by each shaft turn. At the nominal speed of 3600 rpm the pump outputs 202 l/min, while an intermittent ceiling of 4500 rpm allows brief increases in delivery without overstressing internal components. Clockwise rotation when viewed from the shaft end matches common engine drive arrangements. Installation uses an SAE J744 127-2 (C) mounting flange, and torque is transmitted through a 1.25-inch 14-tooth 12/24DP spline shaft that resists wear in cyclic duty. A nominal pressure rating of 400 bar defines continuous system loading and guides selection of compatible hoses and valves.
The integrated EP4 electro-proportional control starts to shift the swashplate at 200 mA and reaches full displacement at 600 mA, giving proportional flow adjustment from remote electronics. The solenoid is powered by a 24 V DC supply; its 22.7 Ω coil resistance determines steady-state current, and a 0.77 A limit protects the winding from thermal damage during prolonged commands. A built-in 100 Hz dither minimizes static friction so the swashplate tracks small signal changes smoothly. The pump can sustain a maximum system pressure of 450 bar during transient loads, and the drive must accommodate 357 Nm of torque at 400 bar when running at full displacement.
Technical Specifications
Control Current End (ep4)
600 mA
Control Current Start (ep4)
200 mA
Direction Of Rotation
Clockwise (shaft view)
Displacement
56 cm³/rev
Dither Frequency (ep4)
100 Hz
Drive Shaft Spline
1.25 in 14T 12/24DP
Flow At Nominal Speed
202 l/min
Max Speed (intermittent)
4500 rpm
Maximum Pressure
450 bar
Mounting Flange
SAE J744 127-2 (C)
Nominal Pressure
400 bar
Nominal Speed
3600 rpm
Solenoid Coil Resistance (ep4)
22.7 Ω
Solenoid Current Limit (ep4)
0.77 A
Solenoid Supply Voltage (ep4)
24 V DC
Torque At 400 Bar
357 Nm
1620 Old Apex Road
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