A10VSO45DFR1/32R Rexroth Piston Pump 45cc 280bar

Product Overview

The A10VSO45DFR1/32R-VPB12N00-S2655 is a Bosch Rexroth A10VSO Series 32 swashplate-type axial piston variable displacement pump with a nominal displacement of 45 cm³/rev (2.75 in³/rev), rated operating pressure of 280 bar (28 MPa / 4000 psi), peak pressure capability of 350 bar (35 MPa / 5000 psi), maximum speed of 2600 rpm, output flow of 67.5 L/min at 1500 rpm, and weight of approximately 30 kg. Designed for hydrostatic drives in open circuits, the pump features a swashplate-type axial piston rotary group, delivering output flow proportional to drive speed and displacement, with stepless variation via swashplate angle adjustment.

This model is equipped with a DFR1 pressure-flow combined controller, integrating pressure compensation (DR) and load sensing (FR) functions in a single controller. The DFR1 version has the X channel blocked from the reservoir; unloading the LS pilot line must be accomplished through the valve system. The pressure control setting range is 20 to 280 bar (standard setting 280 bar), with load sensing differential pressure adjustable from 10 to 22 bar. This control method precisely matches pump output flow to actual system demand, eliminating relief losses, particularly suitable for injection molding machines, presses, and other industrial hydraulic systems requiring precise on-demand flow supply and constant pressure holding.

The A10VSO 32 series reduces airborne noise by 3 dB(A) compared to the previous generation through comprehensive structural optimization. The pump supports 100% through-drive capability, enabling tandem connection with same-size A10VSO pumps or gear pumps for compact integration of multi-circuit hydraulic systems. The A10VSO45DFR1/32R-VPB12N00-S2655 features mounting flange (ISO 3019-2 metric, 2-hole), shaft specifications, and port layouts conforming to Rexroth A10VSO Series standards, enabling drop-in interchangeability with other A10VSO45 models of the same specification.

The pump is widely deployed in injection molding machines, die-casting machines, machine tools, metallurgical equipment, forging equipment, mining machinery, and cranes, particularly suitable for high-power hydraulic transmission applications. The S2655 suffix indicates a customer-specific configuration, which may include specific pressure cut-off settings or LS valve pressure settings.

Every A10VSO45DFR1/32R-VPB12N00-S2655 undergoes 100% simulated duty-cycle testing prior to shipment — covering pressure holding, flow output, control response, and internal leakage — ensuring complete drop-in interchangeability with original Rexroth pumps without installation or plumbing modifications.

Technical Specifications

• Model: A10VSO45DFR1/32R-VPB12N00-S2655

• Material Number (MNR): R902452707

• Brand: Bosch Rexroth

• Series: A10VSO Series 32

• Pump Type: Open-circuit swashplate axial piston variable displacement pump

• Nominal Displacement: 45 cm³/rev (2.75 in³/rev)

• Rated Operating Pressure: 280 bar (28 MPa / 4000 psi)

• Peak Pressure: 350 bar (35 MPa / 5000 psi)

• Maximum Speed: 2600 rpm

• Output Flow at 1500 rpm: 67.5 L/min

• Maximum Flow at 2600 rpm: Approx. 117 L/min (theoretical)

• Control Type: DFR1 pressure-flow combined control (X-T channel blocked version)

• Pressure Control Setting Range: 20–280 bar (standard setting 280 bar)

• Load Sensing Differential Adjustment Range: 10–22 bar

• Direction of Rotation: R (clockwise, viewed from shaft end)

• Mounting Flange: ISO 3019-2 metric, 2-hole

• Shaft Type: ISO keyed shaft (DIN 6885)

• Seals: NBR (Nitrile), FKM option available

• Case Drain Ports: 2

• Through-Drive Capability: Yes, 100% torque transmission

• Weight: Approx. 30 kg

• Inlet Absolute Pressure Range: 0.8–30 bar

• Case Drain Maximum Permissible Backpressure: ≤ 2 bar absolute

• Fluid Cleanliness Requirement: NAS Class 8 (ISO 18/16/13), system filter 10 μm

• Recommended Fluid: ISO VG32 / VG46 anti-wear hydraulic oil (L-HM)

• Operating Temperature Range: -20 to +80 ℃, optimal 40–55 ℃

A10VSO Series 32 Same-Family Displacement Reference (nominal conditions):

• A10VSO28: 28 cm³/rev, 280 bar rated, 350 bar peak, max 3000 rpm, flow at 3000 rpm approx. 84 L/min, weight approx. 15 kg

• A10VSO45: 45 cm³/rev, 280 bar rated, 350 bar peak, max 2600 rpm, flow at 2600 rpm approx. 117 L/min, weight approx. 21–30 kg

• A10VSO71: 71 cm³/rev, 280 bar rated, 350 bar peak, max 2200 rpm, flow at 2200 rpm approx. 156 L/min, weight approx. 33 kg

• A10VSO100: 100 cm³/rev, 280 bar rated, 350 bar peak, max 2000 rpm, flow at 2000 rpm approx. 200 L/min, weight approx. 45 kg

• A10VSO140: 140 cm³/rev, 280 bar rated, 350 bar peak, max 1800 rpm, flow at 1800 rpm approx. 252 L/min, weight approx. 60 kg

Data based on Rexroth A10VSO Series 32 official technical specifications.

Key Technical Advantages

1. DFR1 Pressure-Flow Combined Control — Precise Power Management and Energy Savings

The A10VSO45DFR1/32R-VPB12N00-S2655 features a DFR1 pressure-flow combined controller, integrating pressure compensation (DR) and load sensing (FR) functions in a single controller. Load sensing precisely matches pump output flow to actual system demand, eliminating relief losses; pressure compensation automatically reduces displacement to only leakage flow when system pressure reaches the set point. The DFR1 version has the X channel blocked from the reservoir; unloading the LS pilot line must be accomplished through the valve system. The pressure control setting range is 20–280 bar, with load sensing differential adjustable from 10 to 22 bar. This control method is particularly suitable for injection molding machines, presses, and other industrial hydraulic systems requiring precise on-demand flow supply and constant pressure holding.

2. Low Noise Design — 3 dB(A) Reduction Through Structural Optimization

The A10VSO 32 series reduces airborne noise by 3 dB(A) compared to the previous generation 31 series through comprehensive structural optimization and modal analysis. This improvement is achieved through optimized valve plate flow passages, precision-machined rotary group, and rigid compact housing structure. For injection molding workshops, precision machine tools, and other indoor industrial environments with stringent acoustic requirements, this pump offers significant acoustic advantages, helping to improve working environments and meet noise regulation requirements.

3. High Power Density and Compact Structure — 280 bar from 30 kg

The A10VSO45 delivers approximately 280 bar working pressure at 2600 rpm, weighing only approximately 30 kg, with power density leading among comparable products. The swashplate axial piston design combined with an optimized rotary group achieves efficient power transmission within a compact structure. The pump’s mounting dimensions conform to ISO 3019-2 standards, enabling direct replacement with same-specification A10VSO pumps without modifying the mounting interface. The cradle bearing is hydrostatically unloaded, effectively distributing loads and reducing friction losses for improved operating efficiency and service life.

4. Through-Drive and Flexible System Integration

The A10VSO45DFR1/32R-VPB12N00-S2655 supports 100% through-drive capability, enabling tandem installation of same-size A10VSO axial piston pumps or gear pumps on the rear of the main pump for compact system configurations driven by a single prime mover. The through-drive interface features a standard flange, permitting installation of a second pump. This design provides exceptional integration flexibility in multi-circuit hydraulic systems, reducing the number of independent power units and lowering piping complexity and installation costs.

5. Exceptional Field Interchangeability and Media Compatibility

The A10VSO45DFR1/32R-VPB12N00-S2655 features mounting flange (ISO 3019-2), shaft specifications (ISO keyed shaft), and port layouts conforming to Rexroth A10VSO Series 32 standards, enabling drop-in interchangeability with other A10VSO45 models of the same specification. The pump is compatible with mineral-based hydraulic oil and HF fire-resistant fluids, with NBR seals (FKM option) suitable for standard industrial hydraulic systems. For equipment currently using A10VSO45 series pumps, direct replacement installation is possible without modifying system installation interfaces or plumbing layouts.

Application Areas

• Injection Molding Machines: Main pump for clamping, injection, and holding pressure circuits, with DFR1 control enabling on-demand flow and energy-efficient operation

• Die-Casting Machines: Main hydraulic pump for shot and intensification systems, with high pressure and large flow meeting fast shot demands

• Machine Tools and Tool Machines: CNC lathes, machining centers, and grinding machine clamping, feed, and tailstock drive hydraulic systems

• Hydraulic Presses: Four-column and frame-type hydraulic press power sources

• Metallurgical Equipment: Rolling mill, forging equipment, and continuous casting machine hydraulic power stations

• Mining Machinery: Mining excavator and LHD loader travel drive and auxiliary hydraulic systems

• Cranes: Truck crane and loader crane hydraulic swing and hoist systems

• Marine Auxiliary Equipment: Deck machinery and steering gear hydraulic systems

The A10VSO45DFR1/32R-VPB12N00-S2655 is ideally suited for medium-to-large power industrial hydraulic systems requiring 280 bar continuous working pressure and displacements in the 45 cm³/rev range — the classic configuration for injection molding machine and press hydraulic power units.

Expert Maintenance Tips

1. Shaft Alignment and Coupling Requirements

Maintain concentricity between the pump shaft and drive shaft within 0.05 mm. Flexible couplings are strongly recommended to accommodate minor angular misalignment. The A10VSO45DFR1/32R-VPB12N00-S2655 weighs approximately 30 kg — use appropriate lifting equipment during installation and never strike the shaft end. Tighten mounting flange bolts in diagonal sequence to the specified torque. Couplings must be equipped with protective guards. Motor-to-pump shaft alignment should be checked after installation and again after 500 hours of operation.

2. Pre-Start Filling and Venting Procedure (Mandatory)

Before initial startup, the pump housing must be filled with clean hydraulic oil and maintained full during operation. Slowly fill through the case drain port with ISO VG32 or VG46 anti-wear hydraulic oil to ensure adequate lubrication, cooling, and sealing during startup. Operating an axial piston pump dry — even for a few seconds — will score the swashplate, valve plate, and piston slippers, causing immediate total pressure loss and irreversible damage. Start the pump in jog mode until the pump and piping are sufficiently filled and vented. After complete venting, run at low pressure for 5–10 minutes, then gradually increase to rated pressure.

3. DFR1 Controller Commissioning

Commission the DFR1 pressure-flow combined controller by separately setting the flow valve (FR) standby differential and the pressure valve (DR) cut-off pressure. The pressure control setting range is 20–280 bar, with standard setting at 280 bar. The load sensing differential pressure (Δp) is adjustable from 10 to 22 bar, with standard setting of 20 bar. The pressure compensation setting should be at least 10–15 bar below the system relief valve setting. Adjustment must be performed with the pump at full displacement and low operating pressure to avoid system pressure oscillation. The DFR1 version has a blocked X channel; unloading the LS pilot line must be accomplished through the valve system. The S2655 suffix indicates a customer-specific configuration; verify specific pressure cut-off and LS valve pressure settings before commissioning.

4. Fluid Cleanliness and Filtration

The A10VSO45DFR1/32R-VPB12N00-S2655 requires fluid cleanliness of NAS Class 8 (ISO 18/16/13). Use pressure line filters with 10 μm filtration accuracy. Avoid suction filters, which increase suction resistance and cavitation risk; if essential, use with a vacuum switch monitor. Install a breather filter with filtration accuracy ≤10 μm on the reservoir and regularly check oil level and fluid condition. Case drain backpressure must not exceed 2 bar absolute, with < 1 bar recommended. Hydraulic oil working temperature should not exceed 80 ℃, with optimal operating temperature of 40–55 ℃.

5. Restart Procedure After Extended Shutdown

If the pump has been idle for more than 30 days, manually rotate the shaft several turns to verify free rotation before restarting. Check for abnormal leakage at the case drain port. Pumps stored for more than 3 months should have internal surfaces filled with hydraulic oil, ports sealed, and be stored vertically before restarting. After startup, operate at low pressure for 10–15 minutes until oil temperature reaches normal operating range before applying full load. When using HF fire-resistant fluids, shorten oil change intervals and increase fluid sampling frequency due to reduced lubricity.