LA10VO28DFR/31L Axial Piston Pump | Rexroth Interchangeable 280bar

Product Overview

The LA10VO series are swashplate-type axial piston variable pumps designed for hydrostatic transmissions in open hydraulic circuits. Output flow is proportional to drive speed and geometric displacement, enabling stepless flow regulation by adjusting the swashplate angle. These pumps offer 100% drop-in interchangeability with Bosch Rexroth A10VO series units of the same specification, with identical mounting flanges, shaft dimensions, port positions and control interfaces — no modification to equipment circuits or mounting bases is required. The product line covers Series 31 high-pressure class and Series 52 standard-pressure class. Every unit undergoes full-pressure, full-speed simulated working condition testing before delivery, with strict verification of volumetric efficiency, pressure pulsation and operational reliability to meet continuous high-pressure requirements of mobile machinery and industrial hydraulic systems.

Technical Specifications

• Model: LA10VO28DFR/31L-VSC62N00
  • Product Series: Series 31 (High Pressure)
  • Geometric Displacement: 28 cm³/rev
  • Nominal Pressure: 280 bar (28 MPa)
  • Peak Pressure: 350 bar (35 MPa)
  • Rated Speed: 1800 rpm
  • Maximum Allowable Speed: 3600 rpm
  • Control Mode: DFR pressure-flow control (X-T port open, integrated LS unloading)
  • Rotation (viewed from shaft end): Counter-clockwise
  • Shaft End: Involute splined shaft (VSC62N00 specification)
  • Port Connection: SAE flange
  • Reference Weight: Approx. 15 kg
• Model: LA10VO45DFR1/52R-PUC62N00-S0779
  • Product Series: Series 52
  • Geometric Displacement: 45 cm³/rev
  • Nominal Pressure: 250 bar (25 MPa)
  • Peak Pressure: 315 bar (31.5 MPa)
  • Rated Speed: 2600 rpm
  • Maximum Allowable Speed: 3120 rpm
  • Control Mode: DFR1 pressure-flow control (X-T port closed, external LS unloading required)
  • Rotation (viewed from shaft end): Clockwise
  • Shaft End: Involute splined shaft (PUC62N00 specification)
  • Port Connection: SAE flange
  • Reference Weight: Approx. 21 kg

Key Technical Advantages

1. 9-Piston Swashplate Efficiency: Features a 9-piston precision swashplate layout. The piston and cylinder bore are matched via super-finish grinding, paired with an optimized valve plate flow profile, delivering ≥94% volumetric efficiency and stable internal leakage under high pressure, improving system energy efficiency by over 15% compared to gear pumps of the same displacement.
2. 100% Drop-In Interchangeability: Mounting flange dimensions, shaft parameters, port locations and control interfaces fully match Rexroth A10VO series pumps. Direct replacement eliminates equipment modification, significantly reducing downtime and maintenance costs.
3. Full Working Condition Factory Validation: Each pump is tested under nominal pressure, peak pressure, rated speed and thermal cycling before delivery. Core indicators including volumetric efficiency, pressure pulsation, noise and leakage are inspected item by item to ensure performance meets original factory standards.
4. Dual Series & Control Flexibility: Series 31 280bar high-pressure class suits heavy-duty construction machinery, while Series 52 250bar class fits high-speed industrial equipment. DFR versions with integrated LS unloading suit single-circuit systems, and DFR1 versions match multi-pump proportional valve systems.
5. Low-Noise & Long-Life Construction: Fluid-damping noise-reducing valve plate and housing vibration damping structure effectively suppress fluid pulsation and structural vibration, reducing operating noise to as low as 68 dB(A). Heavy-duty plain bearings and wear-resistant copper alloy piston pairs deliver a service life of over 10,000 hours under continuous rated conditions.
6. High Power Density Compact Housing: High-strength ductile iron one-piece housing provides excellent shock and vibration resistance with an outstanding power-to-weight ratio, ideal for mobile machinery with limited installation space. Through-drive capability allows tandem mounting with gear pumps for multi-circuit supply.

Application Areas

• Construction Machinery: Crawler excavators, wheel loaders, compact excavators, vibratory road rollers
• Agricultural Machinery: Large combine harvesters, high-horsepower tractors, forage harvesters
• Industrial Hydraulic Systems: Machine tool hydraulic stations, injection molding machines, metallurgical auxiliary systems, pressure test machines
• Mining & Specialty Vehicles: Roadheader auxiliary systems, sanitation trucks, fire rescue vehicles
• Marine Deck Machinery: Small steering gear systems, deck windlasses, hydraulic winches

Expert Maintenance Tips

1. Installation Alignment: Connect the pump shaft to the prime mover with a flexible coupling, controlling coaxiality deviation within 0.1 mm. Tighten mounting flange bolts evenly in diagonal sequence to avoid additional radial and axial stress on the pump housing.
2. Fluid & Cleanliness Control: ISO VG46 anti-wear hydraulic oil is recommended, with oil cleanliness no lower than NAS grade 9. The system shall be equipped with a return filter of ≥10μm filtration accuracy. Operating oil temperature shall be maintained at 20~80℃, with a short-term maximum of 90℃.
3. First Commissioning & Running-in: Fill the pump housing with clean hydraulic oil through the drain port before first start to remove trapped air. Run under no-load condition for 10~20 minutes, then gradually increase pressure to nominal level to complete the running-in cycle.
4. DFR/DFR1 Control Adjustment: Turn the pressure cutoff screw clockwise to increase pressure and counter-clockwise to decrease. Load sensing differential pressure is factory-set at 14 bar, adjustable within 10~22 bar per system requirements. Ensure external LS unloading functions properly for DFR1 systems.
5. Periodic Maintenance Schedule: Check oil contamination and external leakage every 2000 operating hours. Replace shaft seals and control cavity seals every 5000 operating hours, and inspect wear condition of swashplate, valve plate and piston assembly.
6. Operation Cautions: Do not run the pump without oil. Do not operate continuously at peak pressure for more than 1 minute per cycle. Avoid frequent impact loads and prolonged operation below minimum suction pressure.