A10VSO71DFLR/31R-PPA12N00 Rexroth Piston Pump 71cc 280bar

Product Overview

The A10VSO71DFLR/31R-PPA12N00 is a Bosch Rexroth A10VSO Series 31 swashplate-type axial piston variable displacement pump with a nominal displacement of 71 cm³/rev (4.33 in³/rev), rated working pressure of 280 bar (28 MPa / 4000 psi), peak pressure capability of 350 bar (35 MPa / 5100 psi), maximum speed of 2600 rpm, and rated speed of 2200 rpm. At rated speed of 2200 rpm, the pump delivers 156 L/min (41.2 gpm) output flow, 73 kW shaft power and 316 N·m output torque at 280 bar, with a case volume of 1.6 L and weight of approximately 33–35 kg.

The core engineering feature of this pump is the DFLR pressure-flow-power combined controller (Pressure, Flow and Power Control). The DFLR controller adds constant power limiting functionality to the DFR pressure-flow control, utilizing a hyperbolic pressure-displacement characteristic to ensure pump drive power does not exceed the set value at constant drive speed: when system pressure rises, pump displacement decreases; when pressure falls, displacement increases — maintaining full utilization of drive power under variable load conditions and effectively preventing electric motor or engine overload.

The A10VSO Series features low-noise operation, excellent suction performance, long service life, and favorable power-to-weight ratio. The pump supports 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 pump features SAE J518 standard ports: 2-inch suction port, 1-inch pressure port, pilot port with 7/16-20 UNF-2B thread, and case drain port with 7/8-14 UNF-2B thread.

The A10VSO71DFLR/31R-PPA12N00 features mounting flange (ISO 3019-2 metric, 4-hole), shaft specifications (Ø32 mm ISO keyed shaft), and port layouts conforming to Rexroth A10VSO Series 31 standards, enabling drop-in interchangeability with other A10VSO71 models of the same specification. The A10VSO Series 31 covers a wide displacement range of 18–140 cm³/rev within a shared mounting flange system, offering DG, DR, DRG, DFR, DFR1, DFLR, and ED control options.

Every A10VSO71DFLR/31R-PPA12N00 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 products without installation or plumbing modifications.

Technical Specifications

• Model: A10VSO71DFLR/31R-PPA12N00

• Brand: Bosch Rexroth

• Series: A10VSO Series 31

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

• Nominal Displacement: 71 cm³/rev (4.33 in³/rev)

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

• Peak Pressure: 350 bar (35 MPa / 5100 psi)

• Maximum Speed: 2600 rpm

• Rated Speed (Vg max): 2200 rpm

• Minimum Speed: 600 rpm

• Output Flow at 2200 rpm: 156 L/min (41.2 gpm)

• Shaft Power at 280 bar: 73 kW

• Output Torque at 280 bar: 316 N·m

• Control Type: DFLR pressure-flow-power combined control

• Pressure Control Adjustment Range: 25–280 bar

• Load Sensing Differential Adjustment Range: 10–22 bar

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

• Mounting Flange: ISO 3019-2 metric, 4-hole (B flange)

• Shaft Type: ISO keyed shaft (Ø32 mm)

• Suction Port: SAE J518 2-inch

• Pressure Port: SAE J518 1-inch

• Pilot Port: 7/16-20 UNF-2B (max pressure 350 bar)

• Case Drain Port: 7/8-14 UNF-2B

• Seals: NBR (Nitrile), FKM option available

• Housing Material: Cast iron

• Case Volume: 1.6 L

• Weight: Approx. 33–35 kg

• Through-Drive Capability: Yes, tandem connection with same-size pumps

• 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), viscosity range 15–100 cSt

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

• Fluid Compatibility: Mineral-based hydraulic oil, HF fire-resistant fluids (HFD optional)

A10VSO Series 31 Same-Family Displacement Reference (nominal conditions):

• A10VSO18: 18 cm³/rev, 280 bar rated, 350 bar peak, max 3000 rpm, weight approx. 12 kg

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

• A10VSO45: 45 cm³/rev, 280 bar rated, 350 bar peak, max 2600 rpm, weight approx. 21 kg

• A10VSO71: 71 cm³/rev, 280 bar rated, 350 bar peak, max 2600 rpm, flow at 2200 rpm 156 L/min, weight approx. 33 kg

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

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

Data based on Rexroth A10VSO Series 31 official technical specifications.

A10VSO Series 31 Control Options:

• DG: Two-point direct control

• DR: Pressure control

• DRG: Remote pressure control

• DFR: Pressure and flow control (X-T port open)

• DFR1: Pressure and flow control (X-T port blocked)

• DFLR: Pressure, flow and power control

• ED: Electro-hydraulic pressure control

• ER: Electro-hydraulic pressure control (with proportional valve)

Key Technical Advantages

1. DFLR Pressure-Flow-Power Combined Control — Intelligent Power Limiting and System Energy Savings

The A10VSO71DFLR/31R-PPA12N00 features a DFLR pressure-flow-power combined controller, adding constant power limiting functionality to the DFR pressure-flow control. The DFLR controller utilizes a hyperbolic pressure-displacement characteristic to ensure pump drive power does not exceed the set value at constant drive speed: when system pressure rises, pump displacement decreases; when pressure falls, displacement increases. The pressure control adjustment range is 25–280 bar and the load sensing differential adjustment range is 10–22 bar. This control method is particularly suitable for injection molding machines, die-casting machines, and hydraulic presses requiring power limiting, effectively preventing motor overload while eliminating relief losses through the load sensing function for significant energy savings.

2. Low Noise Operation and Excellent Suction Performance — Precision Engineering Control

The A10VSO Series 31 is renowned for low-noise operation, effectively suppressing pressure pulsation and fluid-borne noise through optimized valve plate flow passages, precision-machined rotary group, and rigid compact housing structure. The pump delivers excellent suction performance with an inlet absolute pressure range of 0.8–30 bar, combined with optimized suction flow passages ensuring adequate suction at maximum speed to prevent cavitation damage. The cradle bearing is hydrostatically unloaded, effectively distributing loads and reducing friction losses for improved operating efficiency and service life.

3. High Power Density and Compact Structure — Flexible System Integration

The A10VSO71 delivers 156 L/min output flow, 73 kW shaft power, and 316 N·m output torque at 2200 rpm rated speed and 280 bar, weighing only approximately 33–35 kg, with power density leading among comparable products. The swashplate axial piston design with optimized rotary group achieves efficient power transmission within a compact structure. The pump’s mounting dimensions conform to ISO 3019-2 standards with B flange 4-hole mounting and Ø32 mm ISO keyed shaft, enabling direct replacement with same-specification A10VSO pumps without modifying the mounting interface.

4. Through-Drive and Flexible System Integration

The A10VSO71DFLR/31R-PPA12N00 supports 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 housing is designed with 2 drain ports for flexible drain line routing to suit different mounting orientations. 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 A10VSO71DFLR/31R-PPA12N00 features mounting flange (ISO 3019-2), shaft specifications (Ø32 mm ISO keyed shaft), and port layouts conforming to Rexroth A10VSO Series 31 standards, enabling drop-in interchangeability with other A10VSO71 models of the same specification. The pump is compatible with mineral-based hydraulic oil and HF fire-resistant fluids (HFD optional), with NBR seals (FKM option) suitable for standard industrial hydraulic systems. For equipment currently using A10VSO71 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 DFLR control enabling on-demand flow, power limiting, and energy-efficient operation

• Die-Casting Machines: Main hydraulic pump for shot and intensification systems, with DFLR power limiting preventing motor overload

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

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

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

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

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

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

• General Industrial Hydraulic Systems: Suitable for a wide range of mobile and stationary industrial applications, particularly for medium-to-large power hydraulic systems requiring simultaneous pressure, flow, and power control

The A10VSO71DFLR/31R-PPA12N00 is ideally suited for medium-to-large power industrial hydraulic systems requiring 280 bar continuous working pressure, displacements in the 71 cm³/rev range, and DFLR pressure-flow-power combined control — the classic configuration for injection molding machine and hydraulic press 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 A10VSO71DFLR/31R-PPA12N00 weighs approximately 33–35 kg — use appropriate lifting equipment during installation and never strike the shaft end. Tighten ISO 3019-2 flange 4-hole mounting bolts in diagonal sequence to the specified torque. The Ø32 mm ISO keyed shaft engagement with the drive coupling should ensure sufficient keyway engagement length. 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 (7/8-14 UNF-2B) 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. The case drain must be on top of the pump, with a separate line unrestricted to the reservoir extending below the oil level.

3. DFLR Controller Commissioning

Commission the DFLR pressure-flow-power combined controller by separately setting the flow valve (FR) standby differential, pressure valve (DR) cut-off pressure, and power limiting value. The pressure control adjustment range is 25–280 bar and the load sensing differential adjustment range is 10–22 bar. During commissioning, first complete the flow and pressure control adjustments, then locate the power limit adjustment screw (marked Power/HP lim) and apply load at rated speed to set the power curve (P×Q=constant). 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.

4. Fluid Cleanliness and Filtration

The A10VSO71DFLR/31R-PPA12N00 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. Recommended oil viscosity range is 15–100 cSt with operating temperature range of -20 to +80 ℃, optimal 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.