Rexroth A6VM500 High‑Torque Bent‑Axis Variable Motor for Heavy Machinery
Overview and performance highlights
The A6VM500 is a bent‑axis, variable‑displacement axial‑piston motor built for offshore, mining, and construction machinery requiring very high torque in compact envelopes. It delivers high power density, high starting torque, and a wide control range with stepless displacement from Vg max → Vg min = 0. Rated for 350 bar nominal and 400 bar peak, it is offered in Series 63 and supports both open and closed circuits. The large control range enables high‑speed/low‑torque and low‑speed/high‑torque operation from a single unit.
Key specifications A6VM500
Parameter | Value |
|---|---|
Displacement (Vg max) | 500 cm³/rev |
Nominal pressure (p nom) | 350 bar |
Maximum pressure (p max) | 400 bar |
Max. speed at Vg max (n nom) | 2000 rpm |
Max. speed at Vg < Vg x (n max) | 2650 rpm |
Max. speed at Vg min (n max 0) | 2400 rpm |
Theoretical flow at Vg max, n nom (qV nom) | 1000 L/min |
Torque at Vg max, Δp = 350 bar (T) | 2785 N·m |
Approx. weight | 430 kg |
Circuit | Open and closed |
Series | 63 |
Notes: Ratings per A6VM series data for size 500; performance may vary with control variant and system configuration.
Design features and options
Bent‑axis, 9‑piston design with hydrostatically actuated swashplate for smooth, stepless control from Vg max down to zero displacement.
Suitable for open and closed circuits; compact, high‑power‑density package with long service life and high starting efficiency.
Comprehensive factory options: flushing valve, boost‑pressure valve, and high‑pressure counterbalance valve for controlled lowering and load holding; multiple control families available to match response and interface needs.
Typical applications and integration
Ideal for heavy‑duty drives in offshore platforms, mining trucks/loaders, excavators, drilling rigs, and other high‑torque machinery where space and reliability are critical.
The wide control range allows direct drive strategies that can eliminate or downsize multi‑speed gearboxes, reducing complexity and enabling fuel/energy savings.
Model code and ordering guidance
Example breakdown: A6VM500 EP2 / 63W – VZBxxxx – S
A6VM500: Series and size (500 cm³/rev).
EP2: Control family and version (electro‑proportional, variant 2).
/63W: Series suffix and mounting/through‑drive orientation.
VZBxxxx: Port/flange/design and option code.
S: Further variant suffix.
Common controls include EP (electro‑proportional), HZ (servo‑type), DA/HA/HD/EZ (hydraulic/electrical variants). Always order using the complete type code and verify against the nameplate and machine parts list.
Commissioning and maintenance essentials
Select hydraulic oil to achieve an operating viscosity of 16–36 mm²/s at working temperature; avoid HFA fluids. For Series 250–1000 (includes A6VM500), respect a maximum oil temperature of 90°C and cold‑start viscosity up to 1000 mm²/s (short‑term).
Ensure the case drain (T1/T2) returns below the minimum oil level and avoid case pressure build‑up; use separate drain lines if multiple units share a return.
If extreme parameters prevent meeting temperature/viscosity limits, use case flushing via port U or fit flushing/charge valves. Do not exceed 90°C at any point in the motor (Series 250–1000).
