AA10VO100DFR1/31R-VSC62K68 Rexroth 100cc Pump

Product Overview

The AA10VO100DFR1/31R-VSC62K68 is a Bosch Rexroth A10VO Series 31 100 cm³/rev variable displacement axial piston pump designed in a swashplate configuration for open-circuit hydraulic systems.

Bosch Rexroth’s Series 31 documentation describes the product family as an all-purpose medium-pressure axial piston pump featuring variable displacement, good suction characteristics, low noise, long service life, short control response times and multiple hydraulic control options. The Series 31 is rated at 280 bar nominal pressure and 350 bar maximum pressure.

The complete ordering code is critical for replacement selection:

• 100: 100 cm³/rev displacement
• DFR1: Pressure and flow controller with X-T port plugged and flushing function
• 31: Series 3, index 1
• R: Clockwise rotation when viewed from the drive shaft end
• V: FKM fluorocarbon rubber seals
• S: ISO 3019-1 splined shaft
• C: ISO 3019-1 two-hole mounting flange
• 62: SAE flange working-port configuration
• K68: 101-2(B) through-drive hub, 7/8 in, 13T, 16/32DP

Our replacement program focuses on form-fit-function interchangeability, precision manufacturing and 100% simulated working-condition testing, including flow, pressure response, leakage, rotation and operating stability.

Technical Specifications

• Complete Model: AA10VO100DFR1/31R-VSC62K68
• Brand: Bosch Rexroth
• Product Family: A10VO / (A)A10VSO Series 31
• Pump Type: Variable Displacement Axial Piston Pump
• Circuit: Open Circuit
• Design: Swashplate
• Displacement: 100 cm³/rev
• Nominal Pressure: 280 bar / 4,100 psi
• Maximum Pressure: 350 bar / 5,100 psi
• Standard Speed: 2,000 rpm at Vg max
• Permissible Speed: Up to 2,400 rpm at reduced displacement, subject to the official speed/inlet-pressure operating conditions
• High-Speed Version: 2,300 rpm at Vg max for the dedicated high-speed version
• Control: DFR1 pressure and flow controller with X-T plugged and flushing function
• Rotation: Clockwise, viewed from the drive shaft end
• Sealing: FKM / fluorocarbon rubber
• Drive Shaft: ISO 3019-1 splined shaft
• Mounting Flange: ISO 3019-1, two-hole
• Working Ports: SAE flange connections according to ISO 6162, configuration 62
• Through Drive: K68; 101-2(B), 7/8 in, 13T, 16/32DP
• Approx. Weight Without Through Drive: 49.5 kg
• Approx. Weight With Through Drive: 55.4 kg
• Theoretical Maximum Flow: 200 L/min at 2,000 rpm and 100 cm³/rev
• Theoretical Power at 280 bar and 2,000 rpm: approximately 93 kW
• Theoretical Torque at 280 bar and maximum displacement: approximately 445 Nm
• Optimum Viscosity Range: approximately 16–36 cSt
• Continuous Viscosity Range: 10–400 cSt
• Reference Hydraulic Fluid: HLP mineral oil according to DIN 51524-2
• Recommended Fluid Cleanliness: At least ISO 4406 20/18/15
• Standard Minimum Suction Pressure: approximately 0.8 bar absolute, with the actual requirement dependent on speed and displacement
• Maximum Case Pressure: 2 bar absolute
• Primary Technical Reference: Bosch Rexroth RE-A 92711/2021-08-18, (A)A10VSO Series 31.

Engineering Interpretation of the Model Code

AA10VO100DFR1/31R-VSC62K68

The code should be interpreted as a complete engineering configuration rather than a simple model number.

AA10VO100 identifies the 100 cm³/rev variable axial piston pump configuration.

DFR1 identifies the pressure/flow control concept with the X-T port plugged and flushing function.

31R identifies Series 3, Index 1, with clockwise rotation.

VSC62 specifies the sealing material, shaft, mounting flange and working-port configuration.

K68 defines the through-drive arrangement.

This is why a replacement pump should not be ordered simply as:

“Rexroth A10VO100.”

The complete code should be matched wherever the application requires direct interchangeability.

Key Technical Advantages

1. 100 cm³/rev High-Flow Variable Displacement

At 100 cm³/rev and 2,000 rpm, the theoretical maximum flow is approximately 200 L/min. Actual delivered flow depends on volumetric efficiency, operating pressure, oil temperature and viscosity.

Bosch Rexroth’s official data also specify approximately 93 kW of theoretical power at 280 bar and nominal speed.

2. DFR1 Pressure and Flow Control

The DFR1 controller combines pressure and flow regulation.

Rexroth’s official type-code documentation distinguishes:

• DFR: Pressure and flow controller with X-T open
• DFR1: Pressure and flow controller with X-T plugged and flushing function

This distinction is important during replacement because the control configuration directly influences how the pump responds to the hydraulic circuit.

3. Swashplate Axial Piston Technology

The swashplate design regulates displacement by changing the piston stroke within the rotating group.

Key manufacturing factors include:

• Cylinder block accuracy
• Piston-to-bore clearance
• Valve plate flatness
• Swashplate alignment
• Bearing seating
• Shaft runout
• Surface finish

Stable control of these parameters is essential for volumetric efficiency, leakage control, thermal behavior and service life.

4. Strong Suction Characteristics

Bosch Rexroth lists excellent suction characteristics as a Series 31 feature. However, the technical documentation also specifies minimum suction-pressure requirements that vary according to speed and displacement.

This is why correct inlet-line design is essential even when the pump itself has good suction capability.

5. K68 Through-Drive Configuration

The K68 suffix defines a specific through-drive configuration based on a 101-2(B) flange arrangement with a 7/8 in, 13T, 16/32DP hub.

Bosch Rexroth notes that the through-drive allows additional gear pumps or axial piston pumps to be mounted, including combinations up to the same nominal size subject to the applicable configuration limits.

This makes the configuration useful for multi-pump mobile hydraulic systems.

6. Low Noise and Long Service Life

Rexroth identifies low noise, long service life, good power-to-weight ratio and short control response time among the major Series 31 characteristics.

For replacement manufacturing, maintaining rotary-group balance, precision valve-plate surfaces, bearing alignment and controller consistency is essential to preserving these characteristics.

7. Contamination-Control Requirements

Bosch Rexroth specifies a minimum hydraulic-fluid cleanliness level of ISO 4406 20/18/15 and notes that finer filtration can increase the service life of the axial piston unit.

Hydraulic contamination control should therefore be treated as part of the pump replacement process rather than as a separate maintenance issue.

Application Areas

The A10VO Series 31 is designed as a general-purpose medium-pressure variable axial piston pump for:

• Construction equipment
• Excavators
• Loaders
• Material handling machinery
• Agricultural machinery
• Forestry equipment
• Mobile hydraulic systems
• Industrial hydraulic power units
• Press machinery
• Work platforms
• Multi-pump hydraulic systems

The K68 through-drive configuration is particularly relevant where the hydraulic system requires a second pump mounted through the primary unit.

Expert Maintenance Tips

1. Match the Complete Ordering Code

Verify:

AA10VO100DFR1/31R-VSC62K68

rather than relying solely on “A10VO100”.

Check:

• Control
• Rotation
• Seal material
• Shaft
• Mounting flange
• Port configuration
• Through drive

2. Protect the Suction Circuit

Check:

• Suction-line diameter
• Inlet restriction
• Tank level
• Suction strainer
• Air leakage
• Oil viscosity

Inadequate inlet conditions can cause cavitation and accelerate internal damage. Rexroth specifically notes that permissible suction pressure depends on speed and displacement.

3. Maintain Correct Case Drain Conditions

The Series 31 requires a proper case-drain arrangement. Rexroth specifies a maximum case pressure of 2 bar absolute and states that the drain line must return to the reservoir.

4. Maintain Hydraulic Cleanliness

Maintain at least ISO 4406 20/18/15 cleanliness.

If the previous pump failed through bearing damage, cylinder-block wear or severe contamination, identify and remove the source of contamination before installing the replacement unit.

5. Prime Before Full-Load Operation

After installation:

1. Fill and prime the pump according to the machine manufacturer’s procedure.
2. Confirm rotation direction.
3. Start at low load.
4. Check case drain and external leakage.
5. Monitor noise and vibration.
6. Gradually increase pressure.
7. Perform the final operating-condition test.

6. Pay Particular Attention to DFR1 Control Connections

DFR1 is not simply interchangeable with every DFR configuration.

Because the X-T configuration differs, the control piping and commissioning procedure must follow the specific DFR1 arrangement.