A10VSO45DR/31R-PKC62N00 Rexroth 45cc Variable Pump 280Bar

A10VSO45DR/31R-PKC62N00

Product Overview

The A10VSO45DR/31R-PKC62N00 is a Bosch Rexroth A10VSO Series 31 open-circuit swashplate-type axial piston variable pump with a displacement of 45 cm³/rev, equipped with a DR pressure compensator control. The pump’s core function is to automatically destroke the swashplate to minimum displacement when system pressure reaches the DR valve setting, maintaining only makeup flow to compensate for system leakage — effectively minimizing heat generation and energy loss. Flow is proportional to drive speed and displacement, with stepless variation achieved by adjusting the swashplate angle. The pump features SAE flange ports for broad compatibility with North American and global construction machinery. Every unit undergoes 100% simulated working-condition testing before shipment, with flow-pressure characteristics matching the original.

Technical Specifications 

• Full Model Code: A10VSO45DR/31R-PKC62N00

• Series: A10VSO Series 31

• Design Type: Swashplate axial piston variable pump (open circuit)

• Displacement: 45 cm³/rev

• Rotation: Right Hand (R = CW, viewed from shaft end)

• Rated Working Pressure: 280 bar (28 MPa)

• Peak Pressure: 350 bar (35 MPa)

• Minimum Speed: 600 rpm

• Maximum Speed: 2,600 rpm

• Control Method: DR pressure control (pressure compensator)

• Mounting Flange: SAE standard (2-bolt)

• Drive Shaft: Parallel keyed, Ø25 mm

• Pressure Port: SAE J518C – 1″

• Suction Port: SAE J518C – 1.1/2″

• Weight: Approx. 24 kg

• Hydraulic Fluid: Mineral oil / HF fluids (HL, HLP DIN 51524)

• Viscosity Range: 15 – 100 cSt

Key Technical Advantages

1. DR Pressure Compensator Control with Energy-Saving Operation

The DR pressure compensator achieves force balance between spring preload and system pressure. When system pressure is below the set value, the pump maintains its current displacement. When pressure reaches the set value, the compensator pushes the swashplate toward minimum displacement, delivering only the flow required to compensate for system leakage — effectively reducing throttling losses and system heat generation. The pressure adjustment screw changes the set pressure by approximately 50 bar per revolution for precise on-site tuning.

2. Series 31 Swashplate Design with Precision Manufacturing

The rotating group components — piston assemblies, cylinder block, valve plate, and swashplate — undergo precision matched-lapping with micron-level clearance tolerances, ensuring volumetric efficiency stability under sustained heavy-load operation. The swashplate motion mechanism is dynamically optimized for stable output across the full speed range with low flow pulsation.

3. Through-Drive Capability for System Expansion

The pump features a standard through-drive interface, enabling direct mounting of gear pumps or axial piston pumps of the same nominal size (up to 100% through-drive power), facilitating multi-pump configurations while reducing installation space and simplifying system layout.

4. Excellent Suction Characteristics and Low Noise Design

The pump housing flow passages are optimized to provide excellent suction performance across a wide viscosity range (15–100 cSt), effectively reducing cavitation risk. Optimized swashplate bearings reduce operating noise for improved working environments.

Application Areas

• Injection molding machine constant-pressure supply circuits

• CNC machine tool hydraulic power units

• Forging equipment and die-casting machine hydraulic drives

• Construction machinery travel and work equipment hydraulic systems

• Marine steering gear and deck machinery

Expert Maintenance Tips

1. DR Valve Pressure Setting: To adjust the DR valve setting pressure, first tighten the FR (flow control) valve to its bottom stop to disable it. Plug the pump outlet (port B), then rotate the DR pressure adjustment screw (approx. 50 bar per revolution) while monitoring with a pressure gauge until the required maximum working pressure is reached. The setting must not exceed 280 bar.

2. Case Drain Line: The case drain port (L1) must connect directly to the reservoir with a line length not exceeding 2 meters and back pressure below 0.5 bar. For multi-pump configurations, ensure each pump’s case pressure does not exceed the allowable value; use separate drain lines if necessary.

3. Suction Port Pressure: The absolute pressure at the suction port S must not fall below 0.8 bar to prevent cavitation damage to piston assemblies and valve plate.

4. First Startup Air Bleeding: After installation, fill the pump housing completely with clean hydraulic oil and thoroughly evacuate air. Run at no-load below 800 rpm for 5–10 minutes and confirm no abnormal noise before gradually applying load.

5. Fluid Maintenance: Maintain system filtration at ISO 4406 18/16/13 or better. Inspect or replace filter elements every 500 operating hours. Recommended fluid viscosity: 15–100 cSt mineral oil or HF hydraulic fluid.

A10VSO100DR/31R-PPA12N00

Product Overview

The A10VSO100DR/31R-PPA12N00 is a Bosch Rexroth A10VSO Series 31 open-circuit swashplate-type axial piston variable pump with a displacement of 100 cm³/rev, equipped with DR pressure compensator control. As one of the largest standard displacement models in the A10VSO series, this pump delivers high flow output at a rated pressure of 280 bar, making it ideal for centralized hydraulic supply in large-scale systems. The pump features a metric mounting flange and metric pressure ports conforming to ISO standards, widely applied in European and global industrial hydraulic equipment. Flow is proportional to drive speed and displacement, with constant-pressure variable control achieved through the DR pressure compensator. Every unit undergoes 100% simulated working-condition testing before shipment.

Technical Specifications 

• Full Model Code: A10VSO100DR/31R-PPA12N00

• Series: A10VSO Series 31

• Design Type: Swashplate axial piston variable pump (open circuit)

• Displacement: 100 cm³/rev

• Rotation: Right Hand (R = CW, viewed from shaft end)

• Rated Working Pressure: 280 bar (28 MPa)

• Peak Pressure: 350 bar (35 MPa)

• Minimum Speed: 600 rpm

• Maximum Speed: 2,000 rpm

• Control Method: DR pressure control (pressure compensator)

• Mounting Flange: Metric mounting flange (ISO 3019-2)

• Drive Shaft: Ø40 mm, parallel keyed

• Pressure Port: SAE J518C – 1.1/4″

• Suction Port: SAE J518C – 2.1/2″

• Weight: Approx. 50 kg

• Hydraulic Fluid: Mineral oil / HF fluids (HL, HLP DIN 51524)

• Viscosity Range: 15 – 100 cSt

Key Technical Advantages

1. High-Displacement, High Power Density Design

The 100 cm³/rev displacement combined with 280 bar rated pressure enables a single pump to provide ample power for large hydraulic systems. The swashplate design achieves an excellent power-to-weight ratio within a compact cast-iron housing.

2. DR Constant-Pressure Control with Precise Pressure Holding

The pressure compensator automatically adjusts the swashplate to minimum displacement when system pressure reaches the set value, maintaining constant system pressure and compensating only for leakage flow. High pressure adjustment sensitivity and minimal system pressure fluctuation make this pump suitable for industrial hydraulic applications requiring strict pressure stability.

3. Through-Drive and Flexible System Configuration

Standard through-drive interface supports mounting of additional pumps (gear or axial piston) up to the same nominal size, enabling multi-pump parallel systems without additional installation space.

4. Long Service Life and Low Maintenance Cost

Core rotating components are manufactured from high-strength alloy steel with precision heat treatment and matched-lapping, providing excellent wear resistance and fatigue strength. Optimized saddle bearings deliver high load capacity, extending overhaul intervals. The cast-iron housing maintains structural stability under high-temperature and high-pressure conditions.

Application Areas

• Large injection molding and die-casting machine hydraulic systems

• Steel and metallurgy equipment hydraulic power stations

• Large forging equipment hydraulic drives

• Mining machinery centralized hydraulic supply systems

• Marine hydraulic power units

• Large-scale test rig hydraulic loading systems

Expert Maintenance Tips

1. Mounting Surface Precision: Mounting surface flatness should be ≤0.05 mm with roughness Ra ≤3.2 μm. The pump base must have sufficient rigidity, and piping must not exert tensile stress on the housing.

2. DR Valve Commissioning: Refer to the A10VSO45DR DR valve adjustment procedure. Pay particular attention to the pressure rise interval (the pressure differential between the start of swashplate movement and minimum displacement) — consult the official Rexroth technical manual to avoid system oscillation from improper settings.

3. Reservoir Position Selection: The standard installation position is with the pump below the minimum oil level (below-reservoir mounting), utilizing gravity-assisted suction. If above-reservoir mounting (suction lift) is necessary, ensure the absolute pressure at the suction port does not fall below 0.8 bar.

4. Case Drain Management: Keep the drain line unobstructed with a diameter no less than half the main port diameter. For the 100 cm³ large-displacement pump, use a dedicated drain line to avoid back-pressure accumulation from shared lines.

5. Periodic Through-Drive Coupling Inspection: If an additional pump is mounted on the rear through-drive, inspect the coupling spline wear and alignment every 1,000 operating hours to prevent abnormal drive shaft wear from the additional pump load.