A10VO45DFR/31R-VSC62N00 Rexroth Axial Piston Pump 280 Bar

Model Number	A10VO45DFR/31R-VSC62N00, seal kits

Product Description

Product Overview

This A10VO series variable displacement axial piston pump is an OEM-grade replacement for Bosch Rexroth Series 31 open-circuit swash plate pumps, with the core model A10VO45DFR/31R-VSC62N00. It covers mainstream displacement specifications including A10VO45, A10VO71, A10VO100 and A10VO140, providing high-pressure, high-precision hydraulic power output solutions for construction machinery, industrial hydraulic stations, injection molding equipment and other scenarios.

Manufactured in strict compliance with original dimensional chain and performance standards, the pump features 1:1 matching mounting flange, spline shaft extension, port dimensions and control interface with original drawings, enabling 100% direct interchangeability without pipeline or bracket modification. Every unit undergoes full working condition simulation bench test before delivery, including rated pressure holding, peak shock, wide speed range cycle and temperature rise verification, to ensure stable volumetric efficiency and fast response performance under heavy-duty and frequent reversing conditions, meeting the requirements of harsh working conditions in various industries.

Technical Specifications (Bulleted List)

Core Full Model: A10VO45DFR/31R-VSC62N00
Product Series: Rexroth Series 31, swash-plate type variable displacement axial piston pump for open circuits
Geometric Displacement: 45 cm³/r
Rated Continuous Working Pressure: 280 bar
Peak Intermittent Working Pressure: 350 bar
Maximum Continuous Operating Speed: 2600 rpm
Rated Flow: 117 L/min (@2600 rpm, at full displacement)
Control Mode: DFR pressure + flow compound control (Load Sensing + Pressure Compensation)
Rotation Direction: Clockwise (viewed from drive shaft end)
Shaft Extension: Standard spline shaft
Mounting Flange: SAE standard 2-bolt mounting flange, matching original interface
Maximum Allowable Case Drain Pressure: 0.5 bar (above suction pressure), absolute pressure ≤ 2 bar
Full series displacement and corresponding maximum speed:
- A10VO71: 71 cm³/r, max speed 2200 rpm
- A10VO100: 100 cm³/r, max speed 2000 rpm
- A10VO140: 140 cm³/r, max speed 1800 rpm
Reference Weight: Approx. 21 kg (A10VO45), 33 kg (A10VO71), 45 kg (A10VO100), 57 kg (A10VO140)
Main Seal Material: FKM fluororubber
Compatible Fluid: ISO VG32 / VG46 / VG68 high-quality anti-wear hydraulic oil
Operating Oil Temperature Range: -20℃ to 90℃

Key Technical Advantages

Precision Machined Swash Plate Design with High Volumetric Efficiency
Core friction pairs including cylinder bore, valve plate and slipper are processed with CNC honing and super-finish grinding, with flatness controlled at micron level. Combined with optimized kidney-shaped valve port structure and slipper hydrostatic support design, it effectively reduces internal leakage from high-pressure zone to low-pressure zone, achieving volumetric efficiency above 94% under rated working conditions, superior mechanical efficiency over equivalent products, and excellent low-temperature starting performance.
DFR Compound Control with Fast Response and High Energy Efficiency
The DFR pressure and flow compound control mechanism integrates pressure compensation and load sensing functions, steplessly adjusting displacement according to real-time pressure and flow demand of the system load, outputting hydraulic power on demand and eliminating energy loss and oil temperature rise caused by unnecessary overflow. The control spool adopts precision fit tolerance with short response time and smooth displacement, reducing hydraulic energy consumption by more than 20% compared with fixed displacement pump systems, and significantly improving overall fuel and power economy.
Heavy-Duty Material Configuration for Extended Service Life
The drive shaft is made of high-strength alloy structural steel with carburizing and quenching treatment, reaching surface hardness of HRC58-62 with excellent torsion and impact resistance. The valve pair adopts a high-strength cast iron and copper alloy matching scheme with outstanding wear resistance, withstanding pressure shocks caused by frequent reversing. Paired with high-precision heavy-duty rolling bearings, it effectively prolongs the service life of the pump under high-vibration and high-dust working conditions, with mean time between failures greatly exceeding industry standards.
Standardized Interface Design for 100% Direct Damage-free Interchangeability
Mounting flange dimensions, shaft parameters, port positions and control ports fully match the drawing standards of original Rexroth Series 31 A10VO pumps. It can directly replace original pumps of the same model without modifying mounting brackets, connecting pipelines or control oil circuits. It also supports through-shaft drive for series installation of auxiliary pumps of the same size, adapting to multi-circuit hydraulic system requirements, greatly shortening equipment downtime and reducing retrofitting costs and working hours.
Full Working Condition Factory Testing for Stable and Reliable Performance
Each pump passes 100% simulated bench test before delivery, covering multiple inspection items such as rated pressure holding, peak pressure shock, high and low speed cycle, oil temperature rise verification, internal leakage detection and control response test. The one-piece high-strength cast iron housing delivers strong vibration and impact resistance, operating stably over a wide temperature range and in complex environments, and effectively reducing on-site failure risks.

Application Areas

Construction machinery: Hydraulic systems for excavators, wheel loaders, backhoe loaders, pavers, rotary drilling rigs and other mobile equipment
Injection & die casting equipment: Hydraulic power units for clamping, injection and ejection of injection molding machines and die casting machines
Industrial hydraulic stations: Fixed hydraulic systems for metallurgical auxiliary equipment, machine tool hydraulic systems, waste treatment equipment and lifting platforms
Agricultural machinery: Hydraulic systems for modern agricultural equipment such as large silage harvesters, cotton pickers and self-propelled sprayers
Mining and port equipment: Hydraulic systems for mine auxiliary transport vehicles, port forklifts and stackers

Expert Maintenance Tips

Installation Calibration and Case Drain Specifications
Ensure the coaxiality error between the pump shaft and prime mover output shaft is ≤0.1mm during installation, to avoid premature wear of shaft seal and bearing caused by excessive radial force. The pump must be installed with the case drain port at the highest position. The drain line must be independently connected back to the oil tank and must not be connected in series with the return line; case drain pressure shall not exceed 0.5 bar (relative to suction pressure). Fill the pump housing with clean hydraulic oil and exhaust internal air before first startup to avoid dry friction damage to the valve pair and slippers.
Hydraulic Oil and Cleanliness Requirements
High-quality anti-wear hydraulic oil compliant with ISO VG46 is recommended, with oil cleanliness reaching NAS grade 8 or above. The system return filter accuracy shall not be lower than 10μm. Ensure the suction pipeline is perfectly sealed, and suction vacuum degree shall not exceed 0.8 bar to avoid air intake and cavitation, which would cause early pitting of valve plate and cylinder block. Normal operating oil temperature should be controlled between 30℃ and 70℃; long-term operation above 90℃ will accelerate seal aging and oil deterioration, and a cooling device is required for high-temperature working conditions.
Regular Maintenance Interval
Check oil level and cleanliness every 500 working hours, inspect pipeline leakage and loose connections, and clean the suction filter. Replace hydraulic oil and return filter every 2000 working hours, and clean tank bottom deposits at the same time. It is recommended to disassemble and inspect the wear condition of internal friction pairs, check bearing clearance and control spool flexibility every 4000 working hours to predict failure risks in advance.
Common Troubleshooting Key Points
If output pressure is insufficient, first check whether the suction filter is clogged or the system relief valve setting is too low, then inspect whether the DFR control spool is stuck or the pressure regulating spring is invalid. If abnormal noise and vibration occur, focus on checking whether oil is aerated, bearing is worn, or installation coaxiality exceeds the standard. If the housing temperature rises abnormally, check whether the drain line is blocked or internal leakage is excessive. Do not operate the pump with oil shortage or air intake for a long time, to avoid irreversible damage to the pump body.

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