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Axial piston motors are the solution for hydrostatic transmissions requiring high power density, high operating pressures and compatibility with both open and closed circuits.
The Hydraut range, featuring Hydraut and Hytek series, is based on bent-axis architecture, in fixed and variable displacement configurations, with SAE, ISO and plug-in mounting flanges.
Variable displacement enables torque and speed adjustment according to load conditions without the need for external mechanical gearboxes. The range is suited to open and closed circuits, delivering high power density in a compact footprint.
The fixed displacement range comes in multiple construction variants — from conventional mounting to plug-in designs for direct coupling to gearboxes — to match the installation requirements of both mobile and industrial transmissions.
Axial piston motors guide
An axial piston motor does the opposite of a pump: it turns the flow and pressure of the oil into torque and speed on a shaft. With the bent-axis architecture, where the cylinder block is inclined with respect to the shaft, it offers high power density, high starting torque and efficiency over a wide speed range. It drives wheels, winches, slewing gears, mixers and the tools of mobile and industrial machines.
The Hydraut range covers fixed and variable displacement motors with Hytek series, from 10 to 355 cc/rev, for open and closed circuits.
| Series | Brand | Displacement | Displacement range (cc/rev) | Pressure nominal / peak (bar) | Max speed (rpm) | Mounting |
|---|---|---|---|---|---|---|
| HA6VM | Hytek | Variable | 28–250 | 400 / 450 | 5,500 | Flange |
| HA2FM | Hytek | Fixed | 10–355 | up to 400 / 450 | 6,300 | ISO flange |
| HAA2FM | Hytek | Fixed | 45–107 | 400 / 450 | 5,600 | SAE flange |
| HA2FE | Hytek | Fixed | 45–180 | 400 / 450 | 6,300 | Plug-in |
Size the motor from the torque and speed the load requires:
T [Nm] = V [cc/rev] × Δp [bar] × ηmh / (20 × π)
n [rpm] = Q [l/min] × 1000 × ηv / V [cc/rev]
For example, a 56 cc/rev motor with a pressure differential of 300 bar delivers about 267 Nm theoretical; fed with 100 l/min it turns at about 1,785 rpm.
A fixed displacement motor (HA2FM, HAA2FM, HA2FE) has a constant ratio between flow and speed: simple and robust. A variable displacement motor (HA6VM) reduces its displacement to run faster when the load is low and increases it for maximum torque: on many vehicles it removes the need for a mechanical gearbox. The HA6VM is available with hydraulic, electric and automatic high-pressure controls (HD, HZ, EP, EZ, HA).
Choose between flange mounting (ISO or SAE) and the plug-in design of the HA2FE, which mounts directly into planetary gearboxes of winches, slewing drives and wheel drives without a separate coupling and flange.
Fixed displacement Hytek motors are available with pressure relief, counterbalance and flushing valves. The flushing valve keeps oil temperature and cleanliness under control in closed circuits.
All series work in both open and closed circuits. In a hydrostatic transmission with closed circuit, pair the motor with a closed circuit pump such as the HP2VC or the HA4VTG.
Tell us torque, speed and mounting
Our technical team proposes series and size, and checks interchangeability with the motor you use today.
T [Nm] = V [cc/rev] × Δp [bar] × ηmh / (20 × π). A 56 cc/rev motor with 300 bar of pressure differential delivers about 267 Nm theoretical.
When the machine must deliver high torque at low speed and high speed at low load, as in travel drives: the variable motor adapts its displacement and can replace a mechanical gearbox.
A motor designed to be inserted directly into a gearbox, without a separate flange and coupling. The Hytek HA2FE is the plug-in version of the HA2FM, with the same hydraulic specifications.
Yes, all our Hytek axial piston motors work in both open and closed circuits.
Stock items ship in 24–48 hours, standard delivery is 2 weeks. Warranty is 24 months.
