From 4.9 to 500 cc/rev, up to 450 bar: Hydraut, Hytek and Huade series assembled and tested in Italy.
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Axial piston pumps are the most versatile solution for hydraulic circuits requiring high pressures, consistent volumetric efficiency and superior power density compared to gear or vane technologies.
The Hydraut range includes swashplate and bent-axis architectures, in both variable and fixed displacement configurations, with series from Hydraut, Hytek and Huade selected to cover the full application spectrum — from stationary industrial systems to mobile hydrostatic transmissions.
Variable displacement allows real-time flow adjustment to match circuit demands, reducing absorbed power and heat generation. The range includes series for open and closed circuits, with multiple control configurations and through-drive options for multistage installations.
Fixed displacement, combined with a bent-axis architecture, delivers direct power transfer through a simple, low-maintenance construction. The range covers open-circuit applications where reliable constant flow is the primary requirement.
Axial piston pumps guide
An axial piston pump converts the rotation of a shaft into flow through pistons arranged parallel to the drive shaft. It is the right choice when a circuit needs high pressure (250–450 bar), high power density and stable volumetric efficiency over time, where gear and vane pumps reach their limits.
The Hydraut range covers both main architectures, swashplate and bent-axis, with Hydraut, Hytek and Huade series from 4.9 to 500 cc/rev for open and closed circuits.
| Series | Brand | Architecture | Circuit | Displacement | Displacement range (cc/rev) | Pressure nominal / peak (bar) |
|---|---|---|---|---|---|---|
| HSP | Hydraut | Swashplate | Open | Variable | 18–140 | 280 / 350 |
| PQ | Hydraut | Swashplate | Open | Variable | 15–70 | 210–250 / 280 |
| HA10V(S)O | Hytek | Swashplate | Open | Variable | 18–140 | 280 / 350 |
| HP3VO | Hytek | Swashplate | Open | Variable | 40–85 | 280 / 320 |
| HP1VO | Hytek | Swashplate | Open | Variable | 58.5–260 | 350 / 400 |
| HD-A4VSO | Huade | Swashplate | Open | Variable | 40–500 | 350 / 400 |
| HA4VTG | Hytek | Swashplate | Closed | Variable | 71–100 | 320 / 400 – 400 / 450 |
| HP2VC | Hytek | Swashplate | Closed | Variable | 56–180 | 400 / 450 |
| HPPF | Hydraut | Bent-axis | Open | Fixed | 4.9–200 | 400 / 450 |
| HA2FO | Hytek | Bent-axis | Open | Fixed | 10–180 | 400 / 450 |
If your machines use Rexroth A10VSO pumps, the Hydraut HSP series is the alternative we propose: same flanges, same shafts and same ports, so it replaces the original without modifications to the machine. HSP pumps cover 18 to 140 cc/rev at 280 bar nominal and 350 bar peak, with a 9-piston rotary group for low flow pulsation.
For heavy industrial open circuits from 40 to 500 cc, the alternative to the Rexroth A4VSO is the Huade HD-A4VSO, built under Rexroth technology licence with the same controller designations and an extra 370 cc size. The cross-reference table shows the corresponding sizes.
What makes the difference is not the copy of a catalogue, but the service around the pump:
In an open circuit the pump draws oil from the tank and returns it there after the actuators: this is the layout of presses, power units and most industrial machines (HSP, PQ, HA10V(S)O, HP3VO, HP1VO, HD-A4VSO, HPPF, HA2FO). In a closed circuit the oil flows directly between pump and hydraulic motor, as in the hydrostatic transmissions of mobile machines: this needs a pump with charge pump and pressure valves on both lines (HA4VTG, HP2VC).
A fixed displacement pump delivers a flow proportional to speed: it is simple, robust and has fewer wear-prone parts. A variable displacement pump adjusts the swashplate angle and delivers only the flow the circuit needs, reducing absorbed power and heat during stand-by and partial-load phases.
Size the pump from the flow and pressure the circuit requires. Theoretical flow is calculated as:
Q [l/min] = V [cc/rev] × n [rpm] × ηv / 1000
For example, an HSP-45 at 1,500 rpm delivers about 67 l/min theoretical (ηv = 1). Then check that the nominal pressure of the series covers the working pressure, keeping the peak value for transients only.
The controller defines how the pump reacts to the circuit: pressure compensator (DR), remote pressure (DRG), pressure and flow / load-sensing (DFR, DFR1, DRS), power control (LR, LA, DFLR) and proportional electric controls (EP, ED, ERHZ-EQZ). Each series page lists the controllers available.
If you need to drive a second pump from the same shaft, choose a series with through-drive (HSP, HA10V(S)O, HP3VO, HP1VO, HA4VTG, HP2VC). Finally, check flange (SAE or ISO), shaft (keyed or splined) and port position against the installation.
Send us the code of the pump you use today
Our technical team returns the equivalent Hydraut, Hytek or Huade code with a comparison chart.
The Hydraut HSP series. It has the same flanges, shafts and ports as the A10VSO, so it is installed without modifications to the machine. Send us the code you use today and our technical team will confirm the matching HSP code.
In a swashplate pump the pistons run parallel to the shaft and their stroke depends on the angle of an inclined plate: it is compact and easy to make variable. In a bent-axis pump the whole cylinder block is inclined with respect to the shaft: it offers high efficiency and power density and is typically used for fixed displacement pumps such as HPPF and HA2FO.
Industrial machines, presses and power units normally use open circuit pumps. Hydrostatic transmissions of mobile machines, where the pump drives a hydraulic motor directly, use closed circuit pumps such as HA4VTG and HP2VC.
Multiply displacement by speed and volumetric efficiency, then divide by 1000: Q [l/min] = V [cc/rev] × n [rpm] × ηv / 1000. A 45 cc/rev pump at 1,500 rpm delivers about 67 l/min theoretical.
Stock items ship in 24–48 hours; standard delivery is 2 weeks from order confirmation. The warranty is 24 months on the Hydraut, Hytek and Huade lines.
Yes. Our manufacturing partners can build pumps to customer drawings and specifications, including special configurations for non-standard applications.
Rexroth and the series names mentioned are trademarks of their respective owners and are used only to indicate compatibility. Hydraut Europe S.r.l. is not affiliated with Bosch Rexroth.
