A6VM80HA1R1/63W-VZB0170PA Rexroth Motor 80cc 450 bar

Product Overview

The A6VM80HA1R1/63W-VZB0170PA is a bent-axis axial piston variable displacement motor built on the Bosch Rexroth A6VM platform, in the 80 cc displacement size (Series 63). The motor features a bent-axis design with axial tapered piston rotary group, specifically engineered for hydrostatic drives in both open and closed circuits, with stepless displacement adjustment from Vg max down to Vg min = 0.

The A6VM series is Rexroth’s all-purpose high-pressure motor, recognized industry-wide for its high power density, wide control range, and long service life. The series offers a nominal pressure of 400 bar and a maximum pressure of 450 bar. In the 80 cc size, the motor achieves a maximum speed of 3,900 rpm at full displacement and up to 7,350 rpm at minimum displacement, with a maximum output torque of 509 N·m and a weight of approximately 36 kg. Through its large displacement ratio and wide control range, the motor satisfies both high-speed and high-torque requirements.

The model code A6VM80HA1R1/63W-VZB0170PA decodes as follows: A6VM designates the bent-axis variable motor series, 80 is the displacement size (80 cm³/rev), HA1 is the control device code (automatic control, high-pressure related, with minimum pressure increase), R1 is the rotation direction code, 63 is the series designation (Series 63), W indicates bidirectional rotation, V designates the back cover/port type, and ZB0170PA is the control interface and special option code.

Engineered as a form-fit-function replacement for original Bosch Rexroth A6VM80 series motors, this model maintains identical mounting flange dimensions, shaft specifications, port locations, and control interfaces, enabling drop-in interchangeability. Each unit undergoes 100% simulated load testing prior to shipment, validating displacement control response, output torque, and volumetric efficiency against original specifications.

Technical Specifications

• Model: A6VM80HA1R1/63W-VZB0170PA

• Series: Bosch Rexroth A6VM Series (Series 63)

• Motor Type: Bent-axis axial piston variable displacement motor

• Design Feature: Bent-axis configuration, axial tapered piston rotary group

• Maximum Displacement (Vg max): 80 cm³/rev (4.88 in³/rev)

• Minimum Displacement (Vg min): ≈ 0 cm³/rev (steplessly adjustable to zero)

• Nominal Pressure (p nom): 400 bar (5,801 PSI)

• Maximum Pressure (p max): 450 bar (6,527 PSI)

• Max. Speed at Vg max (n nom): 3,900 rpm

• Max. Speed at Vg < Vg max (n max): 6,150 rpm

• Max. Speed at Vg min (n max 0): 7,350 rpm

• Nominal Flow at Vg max, n nom (qV nom): 312 L/min (82.4 US gal/min)

• Maximum Output Torque (Vg max, p nom): 509 N·m (375 lb-ft)

• Control Method: HA1 — Automatic control, high-pressure related, with minimum pressure increase (Δp ≤ approx. 10 bar)

• Rotation: Bidirectional (W)

• Circuit: Open circuit / Closed circuit

• Mounting: SAE flange or DIN flange

• Weight (approx.): 36 kg (79 lb)

• Optional Features: Flushing valve, boost-pressure valve, counterbalance valve (BVD/BVE 20-25/32), speed sensor (NLS)

Key Technical Advantages

1. Bent-Axis Tapered Piston Design with High Power Density

The A6VM80 employs a bent-axis design with tapered pistons that transmit force through tapered contact with the drive plate. Compared to swash plate designs, the bent-axis configuration achieves greater piston stroke and higher load capacity at the same displacement. The large contact area and uniform stress distribution of the tapered pistons effectively reduce wear rates under high-pressure conditions. At the nominal pressure of 400 bar, this design maintains stable volumetric and mechanical efficiency, with a maximum output torque of 509 N·m and an excellent power-to-weight ratio.

2. HA1 Automatic High-Pressure Related Control with Stepless Speed Regulation

The HA1 control device provides automatic control related to high pressure, where motor displacement is automatically adjusted based on operating pressure. As load pressure increases, displacement automatically increases to deliver greater torque; as load pressure decreases, displacement reduces and speed increases, achieving constant-power control characteristics. The HA1 version features a minimum pressure increase (Δp ≤ approx. 10 bar), with control start pressure settable from 80 to 350 bar to suit specific system requirements. This control method is particularly suitable for closed-circuit drive systems requiring automatic load adaptation.

3. Wide Control Range with High-Speed Capability

The A6VM80 offers stepless displacement adjustment from 80 cm³/rev down to near zero, providing an exceptionally wide control range that allows smooth operation at very low speeds while achieving speeds up to 7,350 rpm at minimum displacement. This characteristic enables the A6VM80 to simultaneously satisfy high-torque output and high-speed operation requirements, making it ideal for hydrostatic drive systems demanding wide speed range regulation. Combined with control options such as DA (automatic speed-related control), engine speed-linked control can be achieved.

4. Robust Construction with Extended Service Life

The A6VM series motor features a high-strength cast iron housing with surface-hardened critical moving interfaces. The tapered piston rotary group design provides self-centering capability within the cylinder bores, reducing the risk of uneven wear. Optional long-life bearings (code L) further extend maintenance intervals in demanding applications. The motor withstands extreme operating conditions with very low maintenance requirements, effectively reducing machine downtime. Optional flushing and boost-pressure valves can be directly mounted to the motor, simplifying system piping design.

Application Areas

• Construction Machinery: Excavator travel drives, wheel loader travel drives, roller travel drives, skid steer loaders

• Agricultural Machinery: Combine harvester travel drives, self-propelled sprayers, cotton picker hydrostatic drive systems

• Mining Equipment: Mining truck travel drives, underground transport equipment

• Material Handling: Forklift drives, reach stacker travel systems

• Industrial Drives: Closed-circuit hydrostatic transmission systems, winch drives, swing drives

• Specialty Vehicles: Concrete mixer truck drives, municipal service vehicles

Expert Maintenance Tips

1. Shaft Alignment Requirements: The bent-axis motor’s tapered piston rotary group is sensitive to radial forces. During installation, ensure the coaxiality deviation between the motor shaft and drive-end spline does not exceed 0.05 mm. Excessive radial forces will accelerate wear on the piston tapered surfaces and drive plate, degrading displacement control precision.

2. Hydraulic Fluid Cleanliness Control: The A6VM series motor features precision clearances in the piston and distribution pairs. Maintain hydraulic fluid cleanliness at ISO 19/17/14 or NAS Level 9 or better. Replace hydraulic fluid and filter elements every 1,000 operating hours or annually, with filter element filtration accuracy no less than 10 μm.

3. HA1 Control Mechanism Maintenance: The HA1 control mechanism’s start-of-control pressure should be correctly set according to system requirements (setting range 80 to 350 bar). Verify control response characteristics every 500 operating hours, confirming that displacement adjustment switching time from minimum to maximum is within specification. If response is sluggish, check pilot circuit pressure and control valve spool wear.

4. Closed-Loop Flushing Requirements: When used in closed circuits, a flushing valve is recommended to maintain case temperature below 80°C. Inspect case drain leakage every 200 operating hours; normal leakage should remain below 5 L/min. A sudden increase indicates potential wear on the piston-to-bore clearance or the distribution plate.

5. Restart After Extended Storage: For motors stored over 6 months, manually rotate the shaft 2–3 revolutions to confirm free rotation, then run at low pressure (10 MPa) under no load for 10 minutes, confirming normal case temperature and leakage before gradually applying load.