A7VO160DR/63R-VPB01 Rexroth Bent-Axis Pump 160cc 350bar

Product Overview

The A7VO160DR/63R-VPB01 is a Bosch Rexroth A7VO Series size 160 bent-axis axial piston variable pump, Series 63, with a nominal displacement of 160 cm³/rev, nominal pressure of 350 bar, and maximum pressure of 400 bar. The pump features a bent-axis design for open circuit hydrostatic transmissions, with output flow proportional to drive speed and displacement and stepless flow adjustment achieved by changing the bent-axis angle. The A7VO series is Rexroth’s high-pressure pump platform developed for mobile and industrial applications, covering displacements from 28 to 500 cm³/rev.

The model code A7VO160DR/63R-VPB01 contains comprehensive configuration information: A7VO for bent-axis open circuit variable pump; 160 for nominal size (160 cm³/rev displacement); DR for pressure controller; 63 for series designation (Series 63); R for clockwise rotation (viewed from shaft end); VPB01 for shaft, port, and mounting option codes. Material number is R902233015.

The DR control is the defining technical feature of this model. The hydraulic-mechanical pressure controller senses system pressure via a pilot valve, with a pressure setting range of 50 to 350 bar and standard setting of 350 bar. When system pressure reaches the set value, the control piston drives the bent-axis angle to decrease, and pump displacement automatically reduces to a level sufficient only to compensate for leakage, maintaining constant system pressure while avoiding unnecessary power consumption and fluid heating. This control type is suitable for industrial hydraulic systems requiring prolonged pressure holding such as hydraulic presses and die-casting machines.

Manufactured to exact Rexroth OEM specifications, all mounting dimensions, flange interfaces, and port layouts are fully consistent with the original pump for true drop-in interchangeability. Every unit undergoes 100% simulated operating condition testing before shipment.

Technical Specifications 

• Model: A7VO160DR/63R-VPB01

• Material Number: R902233015

• Series: Rexroth A7VO Series 63

• Pump Type: Bent-axis axial piston variable pump, open circuit

• Nominal Displacement (Vg max): 160 cm³/rev

• Displacement Range: 0 – 160 cm³/rev (stepless variable)

• Nominal Pressure (pnom): 350 bar (5,075 psi)

• Maximum Pressure (pmax): 400 bar (5,800 psi)

• Maximum Speed (at Vg max): 1,900 rpm

• Theoretical Flow at 1900 rpm (Vg max): 304 L/min

• Maximum Power (at Δp = 350 bar): 177 kW

• Maximum Torque (at Δp = 350 bar): 891 N·m

• Control Type: DR — Hydraulic-mechanical pressure controller

• Pressure Setting Range: 50 to 350 bar (standard setting 350 bar)

• Rotation Direction: Clockwise (R — viewed from shaft end)

• Mounting Type: Flange mounting

• Weight (approx.): 71 kg

• Recommended Hydraulic Fluid: HL / HLP mineral oil per DIN 51524

• Fluid Viscosity Range: 10–1,000 cSt

• Fluid Temperature Range: -20 °C to +80 °C

• Maximum Case Drain Pressure: 2 bar absolute

Key Technical Advantages

1. DR Pressure Controller for Precise Constant Pressure Holding: The DR control is the defining technical feature of this model. The hydraulic-mechanical pressure controller senses system pressure via a pilot valve, with a pressure setting range of 50 to 350 bar. When system pressure reaches the set value, the control piston drives the bent-axis angle to decrease, and pump displacement automatically reduces to a level sufficient only to compensate for leakage, maintaining constant system pressure. This mechanism eliminates power waste and fluid heating in applications requiring prolonged pressure holding such as hydraulic presses and die-casting machines.

2. Bent-Axis Design with Spherical Valve Plate Distribution: The A7VO series features a bent-axis (inclined shaft) design with conical piston arrangement. The spherical valve plate design maintains proper sealing contact between the cylinder barrel and valve plate during swivel motion, reducing distribution losses and wear. Compared with swashplate designs, the bent-axis structure imposes smaller lateral forces on pistons, achieving higher mechanical efficiency.

3. High Efficiency with Optimized Rotary Group: The A7VO series 63 features optimized rotary groups that improve overall efficiency by 3 to 5 percent compared to common hydraulic pumps, significantly reducing fuel consumption and operating costs for mobile machinery operators. High hydraulic efficiency is fundamentally determined by working pressure — the higher the pressure, the lower the flow needed to transmit the same power, reducing flow losses in the hydraulic system.

4. High-Pressure Capability with Comprehensive Control Options: The A7VO160 delivers 177 kW maximum power and 891 N·m maximum torque at 350 bar nominal pressure, with peak pressure up to 400 bar. The series offers extensive control options including DR (pressure control), LR (power control), HD (proportional hydraulic control), and others, configurable to match specific system requirements. The DR-controlled pump produces near-maximum displacement until system pressure reaches the set value, with a steady leakage flow from the case drain port.

5. A7VO Series Drop-In Interchangeability with Wide Displacement Coverage: The A7VO series covers displacements from 28 to 500 cm³/rev, with high consistency in mounting flanges, shaft ends, and ports across sizes within the series. The A7VO160DR/63R-VPB01’s mounting dimensions are fully consistent with the original pump, enabling drop-in replacement without piping or coupling modification — dramatically reducing equipment downtime.

Application Areas

• Hydraulic Presses: Main hydraulic pumps for hydraulic presses, die-casting machines, and extrusion machines — constant pressure holding applications

• Construction Machinery: Excavators, cranes, loaders — main or auxiliary hydraulic systems

• Industrial Hydraulics: Metal forming and stamping equipment, machine tools, hydraulic press power units

• Mining Machinery: Mine hoisting equipment, underground drilling rigs

• Marine Hydraulics: Ship steering gear, deck machinery hydraulic power sources

• Oilfield Equipment: Oilfield drilling and production equipment hydraulic drive systems

Expert Maintenance Tips

1. Shaft Alignment and Flange Connection: Concentricity deviation between the pump and drive shaft must be less than 0.05 mm, with angular deviation less than 0.25°. The A7VO160DR/63R-VPB01 uses flange mounting. Tighten flange bolts in diagonal sequence for even loading. Check that the original mounting base locating step is in good condition.

2. Initial Start-Up Filling and Bleeding: Pre-fill the pump with clean HL/HLP mineral oil through the case drain port before installation. Start at the lowest drive speed and observe a steady oil flow from the case drain port free of bubbles. The DR-controlled pump produces near-maximum displacement until system pressure reaches the set value, and a steady leakage flow from the case drain port is normal. Once bleeding is complete, gradually increase to working pressure.

3. DR Pressure Controller Setting Verification: The DR controller pressure setting is factory-calibrated to standard specifications (standard setting 350 bar). After pump replacement, verify the setting matches the original system using a calibrated pressure gauge. If adjustment is required, use dedicated tools and record the original setting for restoration. Any pressure-relief valve included in the system must be set to a cracking pressure at least 20 bar above the controller setting.

4. Zero-Stroke Operation Notes: The standard pump unit is designed for intermittent constant pressure operation. Short-term zero-stroke operation (< 1 min) is permissible up to an operating pressure p = 315 bar at a reservoir temperature of ≤ 50 °C. In the case of longer zero-stroke operation (> 1 min), bearing flushing should be carried out via flushing port U.

5. Fluid Cleanliness and Viscosity Management: Use HL / HLP mineral oil with a viscosity range of 10–1,000 cSt and fluid temperature of -20 °C to +80 °C. System filtration should achieve β10 ≥ 75. Replace filter elements after the first 500 operating hours, then every 1,000 hours or annually thereafter.

6. Case Drain Line Configuration: DR control versions require a drain line from port T to the reservoir. The case drain line must return directly to the reservoir with backpressure not exceeding 2 bar. The drain line inner diameter must be sufficient to ensure unobstructed drainage during cold-start high-viscosity conditions.