A7VO160DR Rexroth Variable Axial Piston Pump 350/400 Bar

Product Overview

The A7VO is a Bosch Rexroth Series 63 variable displacement bent-axis axial piston pump designed for open-circuit hydraulic systems. The official Bosch Rexroth RJ 92202 documentation describes the A7VO as a robust variable pump using tapered pistons, with sizes from 28 to 160, intended for construction and industrial machinery. The Series 63 pressure class is 350 bar nominal and 400 bar peak.

This product page covers two specific configurations:

• A7VO160DR/63R-VPB01
• A7VO107LRDH1/63R-NPB01

The A7VO160DR/63R-VPB01 is indexed with Rexroth product number R902045251, while A7VO107LRDH1/63R-NPB01 is indexed with R902031608. The engineering specifications below are based on the Bosch Rexroth Series 63 technical documentation, while the exact order-number references are cross-checked against publicly available model indexes.

For replacement applications, the complete order code should always be checked because displacement alone does not determine interchangeability. Rotation direction, shaft type, mounting flange, ports, control configuration and factory settings must also match.

Technical Specifications

A7VO160DR/63R-VPB01

• Brand: Bosch Rexroth
• Model: A7VO160DR/63R-VPB01
• Rexroth Product No.: R902045251
• Pump Type: Variable displacement bent-axis axial piston pump
• Circuit: Open circuit
• Nominal Displacement: 160 cm³/rev
• Nominal Pressure: 350 bar / 35 MPa
• Peak Pressure: 400 bar / 40 MPa
• Nominal Speed at Vg max: 1,900 rpm
• Maximum Speed nmax1: 2,560 rpm at reduced displacement
• Maximum Permissible Speed nmax2: 2,850 rpm
• Theoretical Flow at Vg max / nnom: 304 L/min
• Input Power at Vg max, nnom and Δp = 35 MPa: 177 kW
• Torque at Vg max and Δp = 35 MPa: 891 Nm
• Approximate Weight: 71 kg
• Control: DR Constant Pressure Control
• DR Pressure Setting Range: 5–35 MPa
• Rotation: Clockwise, viewed from the shaft end
• Seal Code: V, FKM configuration
• Shaft Code: P, DIN 6885 keyed shaft
• Mounting Flange: B, ISO 3019-2 four-hole flange
• Connection Code: 01, rear SAE flange configuration.

The 350 bar figure is the Series 63 nominal pressure rating, while the DR pressure setting is configurable within 5–35 MPa. Therefore, the exact factory pressure setting should not be inferred from the product family alone.

A7VO107LRDH1/63R-NPB01

• Brand: Bosch Rexroth
• Model: A7VO107LRDH1/63R-NPB01
• Rexroth Product No.: R902031608
• Pump Type: Variable displacement bent-axis axial piston pump
• Circuit: Open circuit
• Nominal Displacement: 107 cm³/rev
• Nominal Pressure: 350 bar / 35 MPa
• Peak Pressure: 400 bar / 40 MPa
• Nominal Speed at Vg max: 2,150 rpm
• Maximum Speed nmax1: 2,900 rpm at reduced displacement
• Maximum Permissible Speed nmax2: 3,200 rpm
• Theoretical Flow at Vg max / nnom: 230 L/min
• Input Power at Vg max, nnom and Δp = 35 MPa: 134 kW
• Torque at Vg max and Δp = 35 MPa: 596 Nm
• Approximate Weight: 49 kg
• Control: LRDH1 Constant Power Control + Pressure Cutoff + Negative Stroke Limiter
• LR Control Start Pressure Range: 5–22 MPa
• Pressure Cutoff Setting Range: 20–35 MPa
• Negative Stroke Limiter Differential Pressure: 2.5 MPa
• Rotation: Clockwise, viewed from the shaft end
• Shaft Code: P, DIN 6885 keyed shaft
• Mounting Flange: B, ISO 3019-2 four-hole flange
• Connection Code: 01, rear SAE flange configuration.

The LRDH1 configuration combines constant-power control, pressure cutoff and a negative hydraulic stroke limiter. Bosch Rexroth specifies that increasing pilot pressure reduces displacement, while the initial no-signal position is Vg max.

Key Technical Advantages

1. Bent-Axis Axial Piston Architecture

The A7VO uses a tapered-piston bent-axis design. Displacement is continuously adjusted through the swivel angle, with theoretical flow proportional to drive speed and displacement. This makes the pump suitable for variable-demand open-circuit systems.

2. 350/400 Bar Pressure Class

Series 63 is documented for 350 bar nominal pressure and 400 bar peak pressure. The 400 bar value is a short-time maximum pressure rather than an unlimited continuous operating pressure, making duty-cycle analysis important during system design.

3. DR Constant Pressure Control

The DR control reduces displacement as outlet pressure approaches the configured pressure setting. The result is a pressure-controlled variable pump that supplies only the hydraulic flow required by the system within its control range. The documented setting range is 5–35 MPa.

4. LRDH1 Multi-Function Control

The LRDH1 combines:

• Constant-power control
• Pressure cutoff
• Negative stroke limitation

The constant-power section reduces displacement as pressure rises, pressure cutoff takes priority at its configured threshold, and the hydraulic limiter provides an additional means of restricting displacement.

5. High Flow and Power Capability

At nominal displacement and nominal speed, the A7VO107 provides a theoretical 230 L/min and the A7VO160 provides 304 L/min. Their corresponding calculated input powers at Δp = 35 MPa are 134 kW and 177 kW, respectively.

These figures demonstrate why drive power and shaft-speed compatibility must be checked whenever an A7VO pump is replaced.

6. Clearly Defined Mechanical Interfaces

The Series 63 coding system identifies important mechanical details directly in the order code. R indicates clockwise rotation viewed from the shaft end, P identifies the DIN 6885 keyed shaft, B identifies the ISO four-hole mounting flange, and 01 identifies the rear SAE flange connection arrangement.

Materials and Manufacturing Engineering

Bosch Rexroth’s publicly available RJ 92202 document does not disclose the complete material BOM, exact steel grades or all proprietary heat-treatment specifications for every internal component. Therefore, unsupported material claims such as a specific alloy grade, hardness value or proprietary coating should not be used as verified product specifications.

For replacement manufacturing, the engineering focus should instead be placed on:

• Rotary-group dimensional accuracy
• Cylinder/piston mating clearances
• Shaft and keyway dimensional control
• Mounting-face accuracy
• Control-valve assembly consistency
• Internal cleanliness and contamination control
• Pressure, displacement and control-response testing

This provides a more defensible engineering basis for an interchangeable replacement product.

Application Areas

Bosch Rexroth identifies the A7VO Series 63 for construction and industrial machinery using open hydraulic circuits.

Typical application areas include:

• Construction machinery
• Heavy-duty mobile hydraulic equipment
• Industrial hydraulic power systems
• High-flow open-circuit systems
• High-pressure actuator systems
• Machinery requiring constant-power control
• Machinery requiring constant-pressure pump control
• Hydraulic pump replacement and equipment refurbishment

Final compatibility should be verified against drive power, shaft speed, suction conditions, hydraulic fluid temperature, pressure duty cycle and control architecture.

Expert Maintenance Tips

1. Maintain Hydraulic Fluid Cleanliness

Bosch Rexroth specifies at least ISO 4406 cleanliness class 20/18/15. At high fluid temperatures measured at R1/R2, the required cleanliness becomes at least 19/17/14.

2. Keep Operating Viscosity Within the Recommended Range

The documented optimum operating viscosity is 16–36 mm²/s, while the allowable continuous viscosity range depends on the actual operating conditions. Oil selection should therefore be based on real operating temperature and load rather than ambient temperature alone.

3. Connect T1 Correctly on Pressure-Controlled Versions

For DR and pressure-cutoff configurations, Bosch Rexroth specifies that the T1 port should be connected to tank. The system relief-valve cracking pressure should be at least 2 MPa above the relevant constant-pressure or cutoff setting.

4. Avoid Prolonged Zero-Stroke Operation

For DR applications, prolonged zero-stroke operation requires special attention. Bosch Rexroth recommends bearing flushing through the U port when extended zero-stroke operation is required. The recommended flushing flow is 12 L/min for A7VO160 and 8 L/min for A7VO107.

5. Verify Rotation Direction Before Commissioning

Both target configurations use the R rotation code, meaning clockwise rotation when viewed from the shaft end. Rotation direction should always be checked against the original drive system before commissioning.