Bosch Rexroth A10VSO Series Industrial Piston Pumps

The Bosch Rexroth A10VSO Series is the premier choice for stationary industrial hydraulic systems. Designed for open-circuit operations, these swashplate-design axial piston pumps are known for their low noise levels and long service life.

These specific configurations—A10VSO71DR/31R-VPA42N00, A10VSO18DR/31R-VSC12N00, and A10VSO28 DFR1/31R-VPA12N00—are high-performance units featuring Viton (FKM) seals. This makes them exceptionally resistant to high temperatures and compatible with specialized hydraulic fluids often found in factory environments.

Engineering Configuration Highlights

Selecting the exact alphanumeric code ensures a perfect “drop-in” replacement for your industrial power unit:

A10VSO71DR/31R-VPA42N00: A 71cc heavy-duty unit featuring DR (Pressure Control). It automatically reduces flow once the set pressure is reached, protecting the system from overload while minimizing energy waste.
A10VSO18DR/31R-VSC12N00: A compact 18cc pump with DR control and a VSC porting configuration. Ideal for smaller industrial auxiliary circuits or pilot pressure supplies.
A10VSO28 DFR1/31R-VPA12N00: A mid-range 28cc pump with DFR1 Load Sensing Control. The DFR1 configuration has the internal X-port plugged, offering a streamlined load-sensing response for specific machine cycles.
Premium Sealing (V): All three models utilize Viton seals, which provide superior protection against heat degradation compared to standard NBR seals.

Exact Technical Specifications Matrix

Feature	A10VSO71DR/31R-VPA42N00	A10VSO18DR/31R-VSC12N00	A10VSO28 DFR1/31R-VPA12N00
Displacement	71 cm³/rev	18 cm³/rev	28 cm³/rev
Control Type	DR (Pressure Control)	DR (Pressure Control)	DFR1 (Pressure & Flow Control)
Circuit Type	Industrial / Open Circuit	Industrial / Open Circuit	Industrial / Open Circuit
Rotation	Right-Hand (Clockwise)	Right-Hand (Clockwise)	Right-Hand (Clockwise)
Seals	V (Viton / FKM)	V (Viton / FKM)	V (Viton / FKM)
Nominal Pressure	280 bar	280 bar	280 bar
Peak Pressure	350 bar	350 bar	350 bar

Frequently Asked Questions (FAQs)

Q1: What is the difference between A10VSO and A10VO pumps?

The A10VSO is designed for stationary industrial applications (S = Stationary). It is optimized for lower noise and specifically configured for factory environments. The A10VO is designed for mobile machinery (O = Off-highway) and is built to handle higher vibrations and different mounting standards.

Q2: Why should I choose the Viton (V) seal option for my A10VSO pump?

Viton seals are essential if your hydraulic system operates at high temperatures or uses fire-resistant fluids. They offer much better chemical resistance and thermal stability than standard Nitrile (NBR) seals, reducing the risk of internal leaks.

Q3: What does the “DR” control actually do?

The DR control is a pressure compensator. It allows the pump to maintain a constant pressure. When the system pressure reaches the value set on the valve, the pump automatically reduces its displacement to near zero, maintaining pressure without wasting energy.

Q4: How does the DFR1 control on the A10VSO28 differ from a standard DFR?

Both are Load Sensing controls. However, the DFR1 has the internal X-port (load signal) plugged. This is often used in specific industrial circuits where the load-sensing signal is managed differently or when a more simplified control response is required.

Q5: Can I use these pumps for a system that rotates counter-clockwise?

No. These specific part numbers feature the “R” designation (31R), meaning they are built for Right-hand (clockwise) rotation. Running them in the wrong direction will result in a failure to prime and cause immediate damage to the internal valve plate.