Rexroth A6VM A6VE variable hydraulic motors for the Bomag Construction Machinery 05800910 05802015 05802508 05802512 05802514 05802517 5800943

Rexroth (part of Bosch Rexroth AG) manufactures the A6VM and A6VE as variable-displacement axial piston motors, built on a swashplate design. Both belong to the same product family and share a nearly identical internal architecture, but they differ in how displacement is controlled:

A6VM — the more common variant on mobile equipment, typically fitted with hydraulic, mechanical, or electro-hydraulic displacement control. This is the motor most often found on Bomag propel drives.

A6VE — functionally similar, but designed with control options oriented toward specific closed-loop travel drive applications, often paired with matching A4VG or A11VO variable pumps.

Both motors operate on the same basic principle: a rotating cylinder block houses pistons that ride against an angled swashplate. Changing the swashplate angle changes piston stroke length, which changes displacement — and therefore output torque and speed — without throttling flow or wasting energy as heat. This is what makes them "variable" rather than fixed-displacement gear or gerotor motors.

How the A6VM/A6VE Fits Into Bomag's Drive System

Bomag builds closed-loop hydrostatic travel drives on most of its rollers, tandem compactors, and pneumatic-tired rollers. The typical circuit looks like this:

Diesel engine → variable axial piston pump (e.g., A4VG) → A6VM/A6VE variable motor → final drive/wheel or drum

Closed-Loop Hydrostatic Circuit

In this arrangement, the pump and motor form a closed loop: oil discharged from the motor returns directly to the pump inlet rather than back to the tank. A charge pump (usually a small gerotor unit mounted on the main pump) tops off the loop and handles case flushing. The A6VM's displacement control responds to signals from the pump's DA (dual displacement) or EP (electro-proportional) control, coordinating pump output and motor displacement so the machine accelerates smoothly and holds a commanded speed under varying load.

Where You'll Find It Physically

On most Bomag single-drum rollers, the A6VM mounts directly to (or drives through a coupling into) the final drive gearbox at the drum or wheel. On tandem rollers, you'll typically find two motors — one per drum — each with independent displacement control feeding into planetary final drives.

Key Specifications to Check Before Ordering a Replacement

Because A6VM/A6VE motors are built to order across dozens of displacement sizes and control variants, matching the nameplate exactly matters more than matching the machine model. Before sourcing a replacement or rebuild kit, gather:

1. Frame Size and Displacement

Expressed as A6VM followed by a number (e.g., A6VM80, A6VM107, A6VM160) indicating maximum displacement in cm³ per revolution. This determines torque and speed capability — swapping to the wrong frame size will throw off drive ratios.

2. Control Code

A short alphanumeric suffix (e.g., HA1, EP1, DA) that identifies the displacement control type — hydraulic, electro-proportional, or automotive control. This must match the rest of the hydrostatic circuit, since the pump's control signal has to be compatible with the motor's actuator.

3. Shaft and Mounting Configuration

Spline type, shaft length, flange pattern (SAE two-bolt or four-bolt), and port location/orientation all vary by application and must match the final drive input.

4. Serial Number

Stamped on the housing, this lets a Bosch Rexroth dealer or Bomag parts department pull the exact original build sheet — the most reliable way to avoid ordering the wrong variant.

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Q1: What's the typical service life of an A6VM motor in a compaction roller application?

A1: There's no fixed number — it depends heavily on duty cycle, fluid cleanliness, and operating environment. Motors in well-maintained fleets with clean fluid and regular monitoring commonly run for several thousand hours between rebuilds, while units in contaminated or poorly maintained systems can fail far sooner.

Q2: Is it normal for the motor case to feel hot to the touch?

A2: Some warmth is normal — axial piston motors generate heat through internal leakage by design. But if case temperature is noticeably higher than the rest of the hydraulic system or rising over time at the same workload, it's worth checking case drain flow and charge pressure.

Q3:What is the price and delivery time of the Rexroth A6VM motor for the Bomag Construction Machinery?

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 Bomag Construction Machinery?

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