Product Overview
The A6V80HA22FZ1027 and A6V80HA22FZ1035 are 80 cm³/rev displacement models from Bosch Rexroth’s A6V series of bent-axis axial tapered piston variable motors, featuring HA2 automatic high-pressure related control. The A6V series variable motors employ an axial tapered piston rotary group of bent-axis design, suitable for hydrostatic drives in open and closed circuits, with displacements ranging from 28 to 1000 cm³/rev.
The A6V80 is a mid-range displacement size in the A6V series, with nominal pressure of 400 bar, maximum pressure of 450 bar, maximum displacement of 80 cm³/rev and minimum displacement of 23 cm³/rev, providing a displacement ratio of Vgmax/Vgmin = 3.47. At Δp=35 MPa pressure differential, maximum torque reaches 445 N·m with maximum output power of 156 kW. Maximum speed at Vg max is 3350 rpm, increasing to 4500 rpm at Vg < Vg max.
HA2 control is an automatic high-pressure related control method where motor displacement is automatically adjusted according to operating pressure, without requiring external pilot signals. The control start pressure setting range is 80 to 350 bar, with displacement automatically increasing with pressure after the control start point is exceeded. Output speed is proportional to input flow and inversely proportional to displacement, with output torque increasing with pressure differential and displacement.
The model code breaks down as follows: A6V identifies the A6V series bent-axis variable motor; 80 denotes the 80 cm³/rev displacement; HA22 indicates HA2 automatic high-pressure related control (control variant 2); FZ denotes SAE flange ports, side connection and DIN 5480 splined shaft (Z code); 1027/1035 is the minimum displacement setting and additional option code.
Every A6V80HA22FZ1027 / A6V80HA22FZ1035 unit undergoes 100% simulated operating-condition bench testing prior to shipment. Mounting flange, shaft end and port dimensions comply with ISO/SAE standards and are identical to the original Rexroth A6V80 series, ensuring true drop-in interchangeability with zero modification required.
Technical Specifications
A6V Series Frame Size Specifications:
A6V28: Displacement 28.1/8.1 cm³/rev, max flow 133 L/min, max speed at Vgmax 4750 rpm, torque constant at Vgmax 4.47 N·m/MPa, max torque at 35 MPa 156 N·m, weight ~18 kg
A6V55: Displacement 54.8/15.8 cm³/rev, max flow 206 L/min, max speed at Vgmax 3750 rpm, torque constant at Vgmax 8.71 N·m/MPa, max torque at 35 MPa 305 N·m, weight ~27 kg
A6V80 (This Model): Displacement 80/23 cm³/rev, max flow 268 L/min, max speed at Vgmax 3350 rpm, max speed at Vg<Vgmax 4500 rpm, torque constant at Vgmax 12.75 N·m/MPa, torque constant at Vgmin 3.73 N·m/MPa, max torque at 35 MPa 445 N·m, max output power 156 kW, moment of inertia 0.0109 kg·m², weight ~39 kg
A6V107: Displacement 107/30.8 cm³/rev, max flow 321 L/min, max speed at Vgmax 3000 rpm, torque constant at Vgmax 17.01 N·m/MPa, max torque at 35 MPa 595 N·m, weight ~52 kg
A6V160: Displacement 160/46 cm³/rev, max flow 424 L/min, max speed at Vgmax 2650 rpm, torque constant at Vgmax 25.44 N·m/MPa, max torque at 35 MPa 890 N·m, weight ~74 kg
A6V80HA22FZ1027 / A6V80HA22FZ1035 Additional Specifications:
Model Codes: A6V80HA22FZ1027, A6V80HA22FZ1035
Type: Bent-axis axial tapered piston variable motor
Maximum Displacement: 80 cm³/rev
Minimum Displacement: 23 cm³/rev (minimum displacement setting 027/035)
Displacement Ratio: 3.47:1 (Vgmax/Vgmin)
Nominal Pressure: 400 bar
Maximum Pressure: 450 bar
Maximum Speed (Vg max): 3350 rpm
Maximum Speed (Vg < Vg max): 4500 rpm
Maximum Flow: 268 L/min
Torque Constant (Vg max): 12.75 N·m/MPa
Torque Constant (Vg min): 3.73 N·m/MPa
Maximum Torque (at Δp=35 MPa): 445 N·m (Vg max) / 130 N·m (Vg min)
Maximum Output Power (at 35 MPa and Qmax): 156 kW
Control Type: HA2 automatic high-pressure related control, displacement automatically adjusted according to operating pressure
Control Start Pressure Setting Range: 80–350 bar
Rotation: Bidirectional
Mounting Type: SAE flange (F code)
Shaft Type: DIN 5480 splined shaft (Z code)
Port Connections: SAE flange ports, side connection
Moment of Inertia: 0.0109 kg·m²
Weight: ~39 kg (manufacturer data) / 34 kg (third-party data)
Circuit Compatibility: Open circuit / closed circuit universal
Operating Temperature Range: -40°C to +115°C
Hydraulic Fluid: Mineral oil (ISO VG46/68), synthetic oil, water glycol
Key Technical Advantages
1. HA2 High-Pressure Automatic Control for Load-Adaptive Displacement Regulation
HA2 control is an automatic high-pressure related control method where motor displacement is automatically adjusted according to operating pressure at port A or B, without requiring external pilot or electrical signals. When operating pressure is below the control start pressure (factory set, range 80–350 bar), the motor maintains minimum displacement; when pressure exceeds the control start point, displacement automatically increases with pressure until reaching maximum displacement. This characteristic enables the A6V80HA22FZ to automatically match speed and torque under variable load conditions, particularly suitable for crane hoist and travel drive applications with frequently varying loads.
2. Bent-Axis Tapered Piston Design for High Power Density and Starting Efficiency
The A6V80 employs Rexroth’s signature bent-axis axial tapered piston rotary group design, with the cylinder block angled relative to the output shaft and tapered pistons transmitting force directly to the drive shaft through a thrust plate. The bent-axis architecture delivers high torque at startup, with maximum torque reaching 445 N·m at Δp=35 MPa. The compact construction and weight of approximately 39 kg deliver class-leading power density among comparable variable motors.
3. Wide Displacement Range for Full-Range Efficiency
The A6V80HA22FZ’s displacement is infinitely variable from Vgmax = 80 cm³/rev to Vgmin = 23 cm³/rev, providing a 3.47:1 ratio. The maximum displacement mode delivers maximum torque for heavy-duty startup and grade climbing; the minimum displacement mode significantly increases speed capability (up to 4500 rpm) for light-load high-speed cruising. Displacement can be adjusted to zero, enabling output shaft idling to reduce hydraulic system power loss and heat generation in transport mode.
4. Multiple Control Options and System Integration Capability
The A6V series offers multiple control methods including HD (hydraulic pilot control), HA (high-pressure automatic control), DA (speed-related control), EL (electrical control) and others, enabling flexible adaptation to different system control requirements. The A6V80HA22FZ with HA2 control is particularly suitable for hoist and travel drive systems requiring load-adaptive functionality. The series can be equipped with flushing and boost pressure valves, as well as built-in or attached counterbalance valves.
5. 100% Simulated Load Testing & Drop-In Interchangeability
Each A6V80HA22FZ1027 / A6V80HA22FZ1035 unit is bench-tested under simulated operating conditions prior to dispatch, covering pressure cycling, displacement response, control signal calibration and thermal variation. Mounting flange, shaft end and port dimensions comply with ISO/SAE standards, matching the original Rexroth A6V80 series exactly, enabling direct replacement without any interface modification.
Application Areas
The A6V80HA22FZ series is widely deployed in travel drive and hoist systems of mobile hydraulic equipment:
Crane Hoist Drives: truck crane and crawler crane main and auxiliary hoist motors (typical application for this model, e.g. XCMG 20-ton crane hoist motor)
Travel Drive Systems: construction machinery travel motors
Rotary Drilling Rigs: power head drives and travel drive systems
Mining: subsurface loaders, mining truck travel drives
Marine & Offshore: deck machinery, winch drives
Concrete Equipment: concrete mixer truck closed-circuit drives
Industrial: hydrostatic transmission systems requiring load-adaptive control
Expert Maintenance Tips
1. HA2 Control Start Pressure Verification: The HA2 control start pressure is factory set within the range of 80–350 bar, with the specific setting indicated on the motor nameplate. Before installation, verify the control start pressure matches the load characteristics of the machine’s hydraulic system. If displacement response is premature or delayed, adjust the spring preload screw on the control valve to change the control start pressure. After adjustment, verify the displacement-pressure response curve under simulated load conditions.
2. Housing Priming Before First Startup: Before first startup, fill the motor housing with clean hydraulic oil through the drain port. An unprimed housing causes dry friction at startup, severely damaging the piston group and distribution mechanism. The drain port must return to the reservoir independently—housing back pressure must not exceed 2 bar. The drain line end must remain submerged to prevent air ingestion. The hydraulic motor housing must be filled with hydraulic oil before startup to prevent damage.
3. Oil Cleanliness and Temperature Control: Maintain system oil cleanliness at ISO 4406 18/16/13 or better. ISO VG46 or VG68 anti-wear hydraulic oil is recommended. Operating oil temperature should be kept below 80°C—system temperature must not exceed 115°C at any point. Normal operating viscosity range is 15–1000 cSt, with recommended industrial filtration accuracy of 23 microns, allowing 75 microns for low-pressure, low-speed or intermittent conditions. Replace hydraulic oil and filter after the first 500 hours, then follow a 2,000-hour or annual replacement cycle.
4. Drain Line Management and Installation Notes: The drain line should return to the reservoir independently, with housing pressure generally limited to 0.1 MPa; excessive pressure can damage seals and cause external leakage. The hydraulic motor can be installed in any position, but the mounting bracket must have sufficient rigidity, and the drive shaft connected to the motor output shaft must be coaxial. The drain line level should be higher than the motor housing level to prevent the housing from draining.
5. Periodic Tapered Piston Group and Bearing Inspection: The A6V80’s tapered pistons, piston rings and bent-axis bearings are primary wear components. Inspect tapered piston-to-cylinder bore clearance, piston ring wear and bent-axis bearing clearance every 2,000 hours. Abnormal efficiency loss, noise or vibration requires immediate shutdown and service. Use Rexroth original specification parts when replacing piston groups. Reducing radial loads on the motor output shaft can extend hydraulic motor service life.
