Rexroth A6VM bent axis hydrauilc motor for the Liebherr wheel loader 10289233 10289244 10298832 11114808 11117878 5716215 5716391 5717096

The A6VM is a variable-displacement, bent-axis piston motor manufactured by Bosch Rexroth, a division of the Bosch Group headquartered in Lohr am Main, Germany. It belongs to Rexroth's A6VM series, part of the broader A6V/A4V family of axial piston units used across construction, mining, agricultural, and material-handling equipment.

Why Liebherr Pairs the A6VM With Its Wheel Loaders

Hydrostatic Drive Philosophy

Liebherr has invested heavily in hydrostatic drive technology, marketed under names like Liebherr Power Efficiency (LPE). The core idea: replace or supplement a torque converter transmission with a closed-loop hydrostatic circuit — a variable pump feeding one or more variable motors — to get stepless speed control, better fuel economy, and reduced heat losses compared to conventional torque-converter drivelines.

The A6VM fits this philosophy because its displacement can be adjusted on the fly. As machine speed increases, the motor's swept volume decreases, letting the machine reach higher travel speeds without needing the pump to work harder than necessary. At low speed and high load — think digging into a stockpile — the motor swings to maximum displacement, maximizing torque at the wheels.

Key Technical Features

Displacement Range and Control Options

A6VM motors are available in a range of displacement sizes (commonly from around 28 cm³/rev up to 1000 cm³/rev across the family), selected to match the axle, wheel motor ratio, and target travel speed of the specific wheel loader model. Control options include:

DA (hydraulic two-point control) — switches between minimum and maximum displacement

HD1 (proportional hydraulic control) — continuous displacement adjustment

EP (electric proportional control) — displacement managed by the machine's electronic control unit, common on newer Liebherr models with more sophisticated drivetrain management

Nine-Piston Bent Axis Design

Most A6VM frame sizes use a nine-piston cylinder block. The odd piston count reduces pressure pulsation and flow ripple compared to even-numbered designs, which translates into smoother torque delivery and lower noise — a meaningful consideration in an operator cab where hydraulic noise is a constant background presence.

Common Failure Modes and What They Tell You

Symptom: Loss of Travel Power Under Load

Usually points to internal leakage past worn piston shoes, cylinder block face, or valve plate — often from contamination or extended operation past the recommended oil change interval. A pressure and flow test at the motor ports, compared against Rexroth's published specs for that frame size, is the standard diagnostic first step.

Symptom: Metallic Whine or Grinding at Speed

Often traces to bearing wear on the output shaft or cylinder block support bearing, frequently accelerated by misalignment during installation or a failed case drain leading to inadequate lubrication.

Symptom: Overheating in the Hydrostatic Circuit

Points toward the flushing valve, cooler circuit, or a pump/motor pairing running outside its efficiency band — sometimes the motor is fine and the real culprit is a clogged cooler or degraded oil losing its viscosity index under heat cycling.

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Q1: How do I know what size A6VM my Liebherr wheel loader uses?

A1: The motor's nameplate carries Rexroth's full model code (e.g., A6VM107...), which specifies displacement, control type, and shaft configuration. Cross-referencing this against Liebherr's parts catalog for the specific machine serial number is the reliable method — displacement sizing can vary even within the same wheel loader model depending on axle ratio and options.

Q2: Is the A6VM used only in wheel loaders?

A2: No. The same series appears across excavators, cranes, agricultural machinery, and other mobile equipment wherever a closed-loop hydrostatic drive with variable torque/speed characteristics is needed. Liebherr's use in wheel loaders is one application among many across the construction equipment industry.

Q3:What is the price and delivery time of the Rexroth A6VM motor for the Liebherr wheel loader?

A3: The specific price and delivery time will depend on the equipment model or specific product model you provide.

Q4: How to purchase a Rexroth A6VM motor for the Liebherr wheel loader?

A4:You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.