A10VO100 DFR1 Rexroth Hydraulic Axial Piston Pump

Product Overview

The A10VO100DFR1/31R-VSC62K68 is a Bosch Rexroth A10VO Series 31 swashplate-type axial piston variable pump with a geometric displacement of 100 cm³/rev, a nominal working pressure of 280 bar, and a peak pressure of 350 bar, engineered for open-circuit hydrostatic drive systems. The pump features a DFR1 pressure and flow controller with integrated pressure cut-off, automatically adjusting displacement and output flow based on system load demand for on-demand oil supply, effectively reducing power loss and oil temperature rise.

The A10VO series covers displacements from 18 to 140 cm³/rev, including A10VO28, A10VO45, A10VO71, and A10VO100. Control options include DR (pressure control), DFR/DFR1 (pressure and flow control), and DFLR (pressure, flow and power control), meeting diverse OEM hydraulic system requirements.

Each unit is manufactured to exact Bosch Rexroth specifications, with mounting flange, drive shaft, port locations, and control interfaces fully dimensionally matched for drop-in interchangeability. Every pump undergoes 100% simulated load testing on our test bench, validating flow characteristics, DFR1 control response accuracy, and sealing integrity across the 280 bar rated and 350 bar peak pressure ranges before shipment.

Technical Specifications 

A10VO100DFR1/31R-VSC62K68 Core Specifications

• Model: A10VO100DFR1/31R-VSC62K68

• Series: Bosch Rexroth A10VO Series 31

• Pump Type: Swashplate-type axial piston variable pump

• Geometric Displacement (Vg max): 100 cm³/rev

• Nominal Pressure (pnom): 280 bar (4,100 psi)

• Peak Pressure (pmax): 350 bar (5,100 psi)

• Maximum Speed (nmax): 2,400 min⁻¹

• Maximum Flow: 200 L/min

• Control Type: DFR1 — Pressure and flow control (with pressure cut-off)

• Circuit Type: Open circuit

• Rotation Direction: Right-hand (R, viewed from shaft end)

• Mounting Type: SAE 2-bolt flange

• Body Material: Cast iron

• Weight (approx.): 55.4 kg

A10VO Series 31 Full Displacement Range

• A10VO28: 28 cm³/rev, rated pressure 280 bar, peak 350 bar, max speed 3,600 min⁻¹

• A10VO45: 45 cm³/rev, rated pressure 280 bar, peak 350 bar, max speed 3,000 min⁻¹

• A10VO71: 71.1 cm³/rev, rated pressure 280 bar, peak 350 bar, max speed 2,200 min⁻¹

• A10VO100: 100 cm³/rev, rated pressure 280 bar, peak 350 bar, max speed 2,400 min⁻¹

• A10VO140: 140 cm³/rev, rated pressure 280 bar, peak 350 bar, max speed 1,800 min⁻¹

Data referenced from Bosch Rexroth official technical manual RE-A 92701 and A10VO series technical documentation.

Key Technical Advantages

1. DFR1 Pressure and Flow Control for On-Demand Oil Supply

The A10VO100DFR1 features a DFR1 pressure and flow controller that integrates pressure control and flow control into a single unit. The pump senses actual system load pressure through the load-sensing port (X port) and automatically adjusts the swashplate angle so that the pump delivers only the flow actually required by the system, rather than full displacement output. When system pressure reaches the pressure cut-off setting, the pump automatically reduces displacement to near zero, maintaining only leakage compensation with minimal power consumption. This characteristic significantly reduces energy loss during holding-pressure conditions, directly translating into fuel savings and system temperature control — particularly suitable for injection molding machines, die-casting machines, and other hydraulic systems requiring prolonged pressure holding.

2. Swashplate Design with Excellent Suction Performance

The A10VO series utilizes a swashplate-type axial piston design with a rotating cylinder block and stationary swashplate, providing excellent suction performance. Pump flow is proportional to drive speed and swashplate angle, with infinitely variable flow achieved by adjusting the swashplate angle. The swashplate is supported by high-capacity bearings, minimizing control torque and ensuring short control response times that quickly track system load changes, ensuring hydraulic system response accuracy under dynamic conditions.

3. Cast Iron Housing with High Power Density and Compact Design

The pump body is constructed from high-strength cast iron, offering excellent compressive strength and thermal stability. The A10VO100 delivers 100 cm³/rev displacement with a single pump weight of approximately 55.4 kg, achieving a leading power density among comparable products. The cast iron housing also provides favorable damping characteristics, and combined with optimized flow passages, effectively reduces operational vibration and noise levels.

4. Through-Drive Capability for System Scalability

The A10VO100DFR1 supports through-drive configuration, allowing the mounting of additional gear pumps or axial piston pumps (up to the same nominal size) on the rear flange for multi-pump tandem configurations without additional installation space. This feature provides high flexibility in system design, suitable for complex mobile machinery and industrial equipment requiring multiple hydraulic circuits.

5. OEM Interchangeability and 100% Simulated Load Testing

The A10VO100DFR1/31R-VSC62K68 features mounting flange dimensions (SAE 2-bolt), drive shaft specifications, inlet/outlet port positions, and DFR1 control interfaces fully matched to the original Bosch Rexroth pump, enabling direct replacement without piping or bracket modification. Every pump undergoes 100% simulated load testing on our test bench, validating flow characteristics, DFR1 control response accuracy, and sealing integrity across the 280 bar rated and 350 bar peak pressure ranges, ensuring first-time pass on commissioning.

Application Areas

The A10VO100DFR1/31R-VSC62K68 is widely deployed in the following machinery and systems:

• Construction Equipment: Hydraulic drive systems for Liebherr LR634, PR734, RL44, LU755 and other models; main hydraulic pumps for Komatsu PC7000 and other large excavators

• Excavators: Main hydraulic pumps for Hitachi, Volvo, Komatsu, Kobelco, Kubota and other brands of mini to large excavators

• Concrete Pumping Equipment: Hydraulic systems for Schwing, Putzmeister and other concrete pump trucks

• Industrial Hydraulic Power Units: Injection molding machine hydraulic power units, die-casting machine hydraulic systems, forging machinery hydraulic drives

• Other Mobile Machinery: Wheel loaders, rotary drilling rigs, lifting machinery and other open-circuit hydraulic systems

Expert Maintenance Tips

Pre-Installation Checks:

• Verify pump rotation direction is right-hand (viewed from shaft end, R). Reverse operation is not permitted.

• Fill the pump housing with clean hydraulic oil (ISO VG46 anti-wear hydraulic oil recommended) before installation to prevent dry-start damage to piston pairs and valve plate.

• Check drive shaft-to-coupling alignment. Use a flexible coupling; radial deviation ≤ 0.05 mm, angular deviation ≤ 0.5°.

• Verify that the DFR1 controller X port (load-sensing port) is correctly connected to the system load-sensing line and is not blocked or misconnected.

DFR1 Controller Adjustment:

• The pressure cut-off setting of the DFR1 controller should be 10%–15% below the system high-pressure relief valve setting. After adjustment, tighten the sealing nut and record the setting dimension for future maintenance reference.

• The X port line of the DFR1 controller must remain unobstructed. The unloading circuit from control valve X port to the reservoir must ensure sufficient flow capacity to prevent the control valve from failing to unload properly.

• Periodically check the load-sensing port (X port) line for sealing integrity. Any leakage will cause pump output flow to deviate from the set value.

Hydraulic Fluid and Filtration:

• Use ISO VG46 anti-wear hydraulic oil with a cleanliness level of NAS Class 9 (ISO 18/15) or better.

• Maintain system filtration at ISO 16/13 cleanliness level or better.

• Replace all hydraulic fluid after the first 100 hours, then every 2000 hours or annually.

Operational Monitoring:

• Continuous working pressure must not exceed 280 bar; short-term peak pressure must not exceed 350 bar.

• Case drain pressure should normally remain below 2 bar. Ensure the drain line is unobstructed and returns below the oil level in the reservoir.

• Pump housing temperature must not exceed 90°C. If exceeded, inspect the cooling system and circuit leakage.

• Every 1000 hours, verify DFR1 controller settings for drift and re-adjust if necessary.