A10VO140DFR1/31R Rexroth Variable Pump 350 Bar

Product Overview

The Bosch Rexroth A10VO140DFR1/31R-PQC62N00-S3086 is an A10VO Series 31, size 140 variable axial piston pump for open-circuit hydraulic systems. The pump uses a swashplate-type axial piston design, with output flow proportional to drive speed and displacement. Bosch Rexroth identifies the Series 31 platform with excellent suction performance, low noise, long service life, favorable power-to-weight ratio, short control time and a broad controller range.

The exact configuration is centered on:

• 140 cm³/rev displacement;
• 280 bar nominal pressure;
• 350 bar maximum pressure;
• DFR1 pressure and flow control;
• clockwise rotation;
• Series 31 construction;
• no through drive;
• SAE J518 port configuration associated with code 62.

The public Bosch Rexroth type-code documentation reviewed does not decode every character of the legacy PQC and S3086 segments individually. They should therefore be retained as order/configuration identifiers rather than assigned unsupported shaft, material or valve functions.

For replacement manufacturing, the engineering target is in-place interchangeability, including mounting geometry, drive interface, port layout and DFR1 control response, followed by 100% simulated working-condition testing.

Technical Specifications

• Brand: Bosch Rexroth
• Complete Model: A10VO140DFR1/31R-PQC62N00-S3086
• Core Model: A10VO140DFR1/31R
• Series: A10VO Series 31
• Nominal Size: NG140
• Pump Type: Variable axial piston pump
• Design: Swashplate
• Circuit: Open circuit
• Maximum Geometric Displacement: 140 cm³/rev
• Nominal Pressure: 280 bar
• Maximum Pressure: 350 bar
• Maximum-Pressure Single Operating Period: 2 ms
• Maximum Total Operating Period at pmax: 300 h
• Nominal Maximum Speed at Vg max: 1800 rpm
• Permissible Maximum Speed below Vg max: 2100 rpm
• Theoretical Flow at 1800 rpm and Vg max: 252 L/min
• Theoretical Flow at 1500 rpm and Vg max: 210 L/min
• Theoretical Input Power at 280 bar and 1800 rpm: 118 kW
• Theoretical Power at 280 bar and 1500 rpm: 98 kW
• Theoretical Torque at 280 bar: 623 Nm
• Theoretical Torque at 100 bar: 223 Nm
• Control: DFR1 pressure and flow control
• DFR1 Standard Differential Pressure: 14 bar
• DFR1 Adjustment Range: 14–22 bar
• Maximum Flow Deviation for Size 140 at 1500 rpm: approximately 6.0 L/min
• DFR1 Pilot Supply: up to approximately 3 L/min
• Rotation: Clockwise, viewed from the drive shaft
• Working Port Configuration: Code 62
• Through Drive: N00, without through drive
• Reference Weight without Through Drive: approximately 65.4 kg
• Housing Oil Volume: approximately 3.0 L
• Maximum Housing Pressure: 2 bar absolute
• Recommended Cleanliness: ISO 4406 20/18/15 minimum
• High-Temperature Cleanliness: ISO 4406 19/17/14 at approximately 90–115 °C
• Optimum Operating Viscosity: 16–36 mm²/s
• Continuous Operating Viscosity Range: 10–400 mm²/s.

Standard vs. High-Speed Version

The exact model supplied here does not carry the H high-speed version code.

For comparison, the official high-speed A10VO140 version is specified at:

• 2050 rpm at Vg max;
• 2200 rpm below Vg max.

Those values must not be transferred to the standard A10VO140DFR1/31R configuration.

Key Technical Advantages

1. Integrated Pressure and Flow Control

The DFR1 controller combines pressure regulation with flow control. Flow is regulated through differential pressure across a variable orifice, while pressure control takes priority when system pressure reaches the configured limit.

This allows the pump to supply hydraulic flow according to actual actuator demand rather than continuously operating at maximum delivery.

2. 140 cm³/rev High-Flow Capability

At 1800 rpm and maximum displacement, the standard A10VO140 provides a theoretical 252 L/min flow rate.

This is suitable for high-flow actuator systems and machines where large cylinder flow demand must be supplied from a single main pump.

3. 280/350 Bar Pressure Platform

The 280 bar nominal and 350 bar maximum pressure ratings provide a substantial pressure range for demanding open-circuit hydraulic systems.

The distinction is important: 350 bar is the specified maximum working pressure for limited operating periods and should not be marketed as the normal continuous rating.

4. Continuous Swashplate Displacement Adjustment

The A10VO architecture continuously changes displacement by adjusting swashplate angle.

The theoretical relationship is expressed by Bosch Rexroth as flow being proportional to displacement and rotational speed, allowing the pump to adapt flow output to machine operating requirements.

5. Low Noise and Service-Oriented Design

Bosch Rexroth lists low noise, long service life, favorable power-to-weight ratio, strong suction performance and short control time among the Series 31 features.

For replacement production, these characteristics depend heavily on rotating-group geometry, cylinder-block/piston matching, valve-plate surface quality, bearing alignment and control-valve response.

6. Robust Rotating-Group Engineering

The critical engineering interfaces include:

• Cylinder block;
• Piston bore fit;
• Piston slippers;
• Valve plate;
• Swashplate;
• Bearings;
• Drive shaft;
• Control mechanism.

The public Bosch Rexroth documents reviewed do not provide material grades for every internal component of the S3086 configuration, so unsupported material claims are deliberately excluded.

7. No-Through-Drive Configuration

N00 identifies the no-through-drive configuration.

This is useful where the pump is installed as an independent hydraulic source. However, a pump from a system originally using a tandem or auxiliary pump cannot be replaced solely on the basis of displacement and pressure. The drive arrangement must also match.

Application Areas

Typical applications for the A10VO Series 31 include:

• Construction machinery
• Excavators
• Wheel loaders
• Agricultural machinery
• Forestry equipment
• Material-handling equipment
• Mobile hydraulic power units
• Industrial open-circuit hydraulic systems
• High-flow hydraulic actuator systems

Bosch Rexroth explicitly classifies the A10VO as an open-circuit variable pump for hydrostatic drives in open circuits.

Series Keyword Qualification

Your original title contains:

• A10VO45
• A10VO74
• A10VO100
• A10VO140

The official Series 31 documentation reviewed lists A10VO sizes 28, 45, 71, 88, 100 and 140. A10VO74 is not listed in this official Series 31 type-code table, so no 74 cm³/rev specification, pressure or speed should be invented for the SEO page.

Expert Maintenance Tips

1. Test Pressure and Flow Regulation Together

For DFR1, do not test only maximum flow.

Monitor:

• Pump pressure;
• Flow;
• Differential pressure;
• Swashplate response;
• Standby behavior;
• Regulation stability.

The real value of DFR1 is its pressure-dependent flow regulation.

2. Verify DFR1 Differential Pressure

The published DFR1 reference is:

• Standard: 14 bar
• Adjustable range: 14–22 bar

Incorrect Δp adjustment can result in high standby pressure, unstable actuator response, increased heat generation or abnormal flow regulation.

3. Do Not Confuse Standard and High-Speed Versions

The complete model does not contain the H high-speed version code.

Therefore use:

• 1800 rpm nominal maximum at Vg max;
• 2100 rpm permissible maximum below Vg max.

Do not apply the high-speed version’s 2050/2200 rpm figures to this standard unit.

4. Protect the Suction Side

Bosch Rexroth specifies that minimum suction pressure depends on speed and displacement.

Poor inlet conditions can cause cavitation, and continuous operation above nominal speed can further reduce service life through cavitation erosion.

5. Control Housing Back Pressure

For NG140:

• Maximum housing pressure: 2 bar absolute
• Housing pressure should not exceed suction pressure by more than approximately 0.5 bar

Inspect drain-line diameter, return-filter restriction, tank level and hose routing during installation.

6. Check Shaft Loading

The published NG140 limits include:

• Maximum radial load reference: 2800 N
• Maximum axial load reference: ±4800 N

These are maximum limits, not continuous operating targets. Additional calculation is required for gear, belt or other radial-loading drives.

7. Maintain Hydraulic Cleanliness

Maintain at least:

• ISO 4406 20/18/15
• 19/17/14 at very high oil temperatures

Contamination accelerates wear of the cylinder block, pistons, valve plate, control components and bearings. Bosch Rexroth explicitly links improved filtration with increased axial-piston-unit service life.

8. Perform 100% Simulated Working-Condition Testing

For an aftermarket A10VO140DFR1/31R-PQC62N00-S3086 replacement unit, the final inspection should include:

• Start-up and suction performance;
• Standard 1800 rpm operation;
• DFR1 pressure regulation;
• DFR1 flow regulation;
• 14 bar Δp reference verification;
• 280 bar nominal-pressure loading;
• Controlled high-pressure testing;
• Flow deviation;
• Internal leakage;
• Housing pressure;
• Temperature rise;
• Noise;
• Vibration;
• Thermal stability.