Rexroth A10FM 23 Hydraulic Motor
Product Overview
The A10FM 23 is a fixed displacement axial piston motor in swashplate design from the Rexroth A10FM series 52 range. With a geometric displacement of 23.5 cm³ per revolution it works as a constant motor in hydrostatic drives: output speed is proportional to the inlet flow, while output torque increases with the pressure differential between the high and low pressure sides. It is released for both open and closed circuits and for mobile as well as industrial duty.
Size 23 is the fastest unit in the line-up, which makes it a frequent choice where a small displacement has to be combined with high rotational speed. The well-proven A10 rotary group, the high power-to-weight ratio and low operating noise are the practical benefits behind the specification figures below.
Technical Data - Size NG 23
| Displacement, geometric (Vg max) | 23.5 cm³/rev (1.43 in³) |
| Nominal pressure (pnom) | 280 bar (4100 psi) |
| Maximum pressure (pmax) | 350 bar (5100 psi) |
| Maximum rotational speed at Vg max | 4900 rpm |
| Inlet flow at nnom | 115 L/min (30.4 gpm) |
| Power at 280 bar | 53.6 kW |
| Torque at Vg max and 280 bar | 105 Nm (77.4 lb-ft) |
| Actual starting torque at n = 0 | approx. 75 Nm |
| Rotary stiffness of drive shaft (R / C) | 28478 / 30017 Nm/rad |
| Moment of inertia of rotary group | 0.0017 kgm² |
| Maximum angular acceleration | 5500 rad/s² |
| Case volume / weight, approx. | 0.6 L / 12 kg |
| Max. perm. axial / radial shaft load | 1000 N / 1200 N |
Theoretical values without efficiency and tolerances, rounded. Maximum speed depends on the output pressure at the working port.
Key Features
Long service life with the established axial piston rotating group.
4900 rpm at full displacement, ideal for small-displacement high-speed drives.
53.6 kW from a 12 kg frame with a high power-to-weight ratio.
Swashplate design with quiet running characteristics.
One unit for both circuit types, medium-pressure duty up to 280 bar.
Speed sensing prepared for DST / DSAx sensors; anti-cavitation valve for fan drives.
Available Configurations
W - splined, reduced torque
C - tapered with key and bolt
Threaded ports to DIN 3852-1 / ISO 11926
Anti-cavitation valve
Installation and Operating Notes
Any mounting position may be used. Before start-up the housing has to be filled with hydraulic fluid, and the drain line is laid so that the housing does not empty itself while the shaft stands still - the port at the highest point serves both filling and draining.
With the drive shaft in view, supplying port A turns the shaft clockwise and supplying port B turns it anticlockwise. The specified fluid is HLP mineral oil to DIN 51524, held at a purity class of at least 20/18/15 to ISO 4406; once viscosity at the drain port drops under 10 mm²/s, 19/17/14 applies instead.
Efficiency is best between 16 and 36 mm²/s. Working viscosity may range from 400 down to 10 mm²/s, brief excursions to 7 mm²/s are acceptable, and a cold start may reach 1600 mm²/s. Fluid temperature at port LX must not exceed 110 °C with FKM seals. On the pressure side, hold at least 10 bar absolute at the high-pressure port and 2 bar absolute at the low-pressure port, with no more than 2 bar absolute static at the drain connections.
A10FM 23 - Frequently Asked Questions
Request a Quotation for A10FM 23
Tell us the required shaft end, port variant, valve options and quantity - we will reply with the confirmed type code, price and delivery time.
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