A6VM140EP2/63W-VZB010FPA Rexroth Motor | 450 Bar 140cc

Product Overview

The A6VM140EP2/63W-VZB010FPA is a 140 cm³/rev displacement model from Bosch Rexroth’s A6VM series 63 generation of bent-axis axial tapered piston variable motors, featuring EP2 proportional electric control. This model is a core product of Rexroth’s high-pressure variable motor platform, covering displacements from 28 to 1000 cm³/rev with nominal pressures up to 400 bar and maximum pressures up to 450 bar, suitable for hydrostatic drives in both open and closed circuits across mobile machinery and stationary industrial applications.

The A6VM series employs an axial tapered piston rotary group of bent-axis design, with displacement infinitely variable from Vg max to Vg min = 0. The wide control range enables the variable motor to satisfy requirements for both high rotational speed and high torque. Motor output speed depends on pump flow and motor displacement, with output torque increasing as the pressure differential between high and low pressure sides increases. The series features high power density, compact structure, favorable power-to-weight ratio and long service life, with optional function modules including speed sensors, flushing valves, bidirectional balance valves and cartridge relief valves available as standard, compatible with standard/cartridge stop flanges for customized complex operating requirements.

The model code breaks down as follows: A6VM identifies the A6VM series bent-axis variable motor; 140 denotes the 140 cm³/rev displacement; EP2 indicates proportional electric control type (EP=proportional electric control, 2=control variant); 63W indicates series 63, with W being the cartridge central flange mounting structure (direct insertion into gearbox housing, industry-standard travel configuration); VZB010FPA is the mounting flange, port configuration and additional option combination code.

Every A6VM140EP2/63W-VZB010FPA unit undergoes 100% simulated operating-condition bench testing prior to shipment, covering pressure cycling, displacement response, control signal calibration and thermal shock. Mounting flange, shaft end and port dimensions comply with ISO/SAE standards and are identical to the original Rexroth A6VM140 series, ensuring true drop-in interchangeability with zero modification required.

Technical Specifications

A6VM Series Frame Size Specifications:

• A6VM28: Displacement 28.1 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar, max speed 5550 rpm, max flow 156 L/min, max torque 179 N·m, weight 16 kg, moment of inertia 0.0014 kg·m²

• A6VM55: Displacement 54.8 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar, max speed 4450 rpm, max flow 244 L/min, max torque 349 N·m, weight 26 kg, moment of inertia 0.0042 kg·m²

• A6VM80: Displacement 80 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar, max speed 3900 rpm, max flow 312 L/min, max torque 509 N·m, weight 34 kg, moment of inertia 0.0080 kg·m²

• A6VM107: Displacement 107 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar, max speed 3550 rpm, max flow 380 L/min, max torque 681 N·m, weight 47 kg, moment of inertia 0.0127 kg·m²

• A6VM140 (This Model): Displacement 140 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar, max speed 3250 rpm, max flow 455 L/min, max torque 891 N·m, torque constant 2.23 N·m/bar, weight 60 kg, moment of inertia 0.0207 kg·m²

• A6VM160: Displacement 160 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar, max speed 3100 rpm, max flow 469 L/min, max torque 1019 N·m, weight 64 kg, moment of inertia 0.0253 kg·m²

• A6VM200: Displacement 200 cm³/rev, nominal pressure 400 bar, peak pressure 450 bar, max speed 2900 rpm, max flow 580 L/min, max torque 1273 N·m, weight 80 kg, moment of inertia 0.0353 kg·m²

• A6VM250: Displacement 250 cm³/rev, nominal pressure 350 bar, peak pressure 400 bar, max speed 2500 rpm, max flow 625 L/min, max torque 1391 N·m, weight 90 kg, moment of inertia 0.061 kg·m²

A6VM140EP2/63W-VZB010FPA Additional Specifications:

• Model Code: A6VM140EP2/63W-VZB010FPA

• Type: Bent-axis axial tapered piston variable motor

• Maximum Displacement: 140 cm³/rev

• Minimum Displacement: 0 cm³/rev (infinitely adjustable to zero)

• Nominal Pressure (Continuous): 400 bar (5,800 psi)

• Peak Pressure (Intermittent): 450 bar (6,525 psi)

• Maximum Speed (Vg max): 3,250 rpm

• Maximum Speed (Vg < Vg max): 5,150 rpm

• Maximum Flow: 455 L/min

• Maximum Torque (at Δp=400 bar): 891 N·m

• Torque Constant: 2.23 N·m/bar

• Control Type: EP2 proportional electric control, proportional solenoid driven, displacement proportional to control current

• Control Signal: Current control, 12V or 24V system compatible

• Rotation: Bidirectional (clockwise / counter-clockwise)

• Mounting Type: Cartridge central flange (63W), direct insertion into gearbox housing

• Mounting Flange: ISO 3019-2 4-hole flange

• Shaft Type: DIN 5480 splined shaft

• Port Connections: SAE flange ports (ports A and B)

• Circuit Compatibility: Open circuit / closed circuit universal

• Operating Temperature Range: -40°C to +115°C

• Case Volume: 1.8 L

• Moment of Inertia: 0.0207 kg·m²

• Weight: ~60 kg

Key Technical Advantages

1. Bent-Axis Tapered Piston Design for High Power Density and Starting Efficiency

The A6VM140EP2 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 favorable starting efficiency. This design has been proven over more than 50 years in high-pressure variable hydraulic transmission applications, offering significant mechanical efficiency advantages under high-pressure conditions compared to swashplate designs. One-piece tapered pistons with piston rings minimize internal leakage. Volumetric efficiency exceeds 97% with mechanical efficiency exceeding 93%.

2. High Pressure Capability — 400 Bar Nominal, 450 Bar Peak

The A6VM140EP2 supports 400 bar nominal working pressure and 450 bar maximum working pressure, with 891 N·m rated torque at Δp=400 bar and a torque constant of 2.23 N·m/bar. Maximum flow reaches 455 L/min with maximum power up to 151 kW. This power density leads among comparable variable motors, offering significant advantages in excavator travel drives, swing drives and rotary drill head applications under heavy-duty intermittent conditions.

3. EP2 Proportional Electric Control for Precise Stepless Displacement Modulation

This model is configured with EP2 proportional electric control, achieving stepless displacement modulation through a proportional solenoid. Control current is proportional to displacement, with displacement continuously variable from Vg max to Vg min = 0. Compared to hydraulic pilot control, proportional electric control offers faster response, higher control precision and easier integration with machine electronic control systems. The control piston directly acts on the cylinder body’s swing-angle adjustment mechanism, with swing-angle adjustment time less than 0.3 seconds for rapid response.

4. 63W Cartridge Central Flange Mounting for Gearbox Integration

This model features 63W cartridge central flange mounting, with the mounting flange positioned at the center of the housing, allowing the motor to be directly inserted into the gearbox housing. This architecture maximizes space savings, making it particularly suitable for travel drive gearboxes, wheel-end gearboxes and other space-constrained applications. The motor simply slides into the gearbox for assembly, requiring no complex mounting tolerance compliance, significantly reducing assembly difficulty and labor cost. The cartridge design also creates a rigid connection between motor and gearbox, improving overall drivetrain rigidity and vibration resistance.

5. 100% Simulated Load Testing & Drop-In Interchangeability

Each A6VM140EP2/63W-VZB010FPA 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 3019-2 and DIN 5480 standards, matching the original Rexroth A6VM140 series exactly, enabling direct replacement without any interface modification.

Application Areas

The A6VM140EP2 series is widely deployed in travel drive systems of mobile hydraulic equipment:

• Excavator Travel Drives: track excavator travel motors, combined with A4VG series variable pumps in closed-circuit drivetrains, e.g. Caterpillar 300 series, Komatsu PC series

• Rotary Drilling Rigs: power head drives and travel drive systems

• Wheel Loaders: travel drive systems

• Road Rollers: vibratory roller travel drives

• Concrete Equipment: concrete mixer truck closed-circuit drives

• Mining: subsurface loaders, mining truck travel drives

• Lifting Equipment: crawler crane travel drives

• Marine & Offshore: deck machinery, winch drives

Expert Maintenance Tips

1. Proportional Electric Control Signal Calibration and Displacement Verification: The EP2 proportional electric control requires control signal calibration after installation to confirm minimum displacement position (0 cm³/rev) and maximum displacement position match the technical manual. Control current range should be set per Rexroth technical manual to ensure linear proportional relationship between displacement and control current. If displacement response exhibits lag or drift, inspect proportional solenoid operating condition, control spool for sticking and pilot circuit for air entrainment. Establish a displacement-current calibration curve in the machine electronic control system.

2. Cartridge Interface Seal Inspection: The A6VM140EP2 employs 63W cartridge central flange mounting, with the sealing surface between motor and gearbox being a potential leak point. Clean the cartridge interface mating surface before installation and inspect O-rings and seals for integrity. After insertion, confirm flange bolts are evenly tightened in a diagonal sequence to Rexroth technical manual torque values. Periodically inspect the cartridge interface for leakage, especially under frequent pressure cycling conditions.

3. Housing Priming Before First Startup: Before first startup, fill the motor housing (case volume 1.8 L) with clean hydraulic oil through the drain port. An unprimed housing causes dry friction at startup, severely damaging the piston group and distribution mechanism. After extended shutdown, fill the housing again before restarting. 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.

4. Oil Cleanliness and Temperature Control: Maintain system oil cleanliness at ISO 4406 18/16/13 or better. Operating oil temperature should be kept below 80°C—system temperature must not exceed 115°C at any point. VG 46 or VG 68 hydraulic oil is recommended at 60°C operating temperature, with the higher viscosity class VG 68 preferred. Replace hydraulic oil and filter after the first 500 hours, then follow a 2,000-hour or annual replacement cycle.

5. Zero Displacement Function and Transport Mode Maintenance: The A6VM140EP2’s zero displacement function significantly increases machine transport speed. In transport mode with displacement near zero, verify that the gearbox lubrication system remains operational. Inspect system pressure, flow and temperature parameters in zero displacement mode every 500 hours to confirm proper operation and gearbox lubrication.

6. Periodic Tapered Piston Group and Bent-Axis Bearing Inspection: The A6VM140EP2’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 to ensure fit accuracy and assembly torque per technical manual requirements.