Rexroth A2FE fixed hydraulic motor for Kässbohrer equipment 8.047.192.000.0 8.047.171.000.0 8.047.099.000.0

The A2FE is a fixed displacement, bent-axis (angled-axis) axial piston motor manufactured by Bosch Rexroth, designed specifically as a plug-in (cartridge-style) unit rather than a flange-mounted stand-alone motor. Instead of bolting to the outside of a gearbox housing, the A2FE slides directly into a machined cavity inside a mechanical gearbox, using a recessed mounting flange located in the center of its case. That design saves significant space and simplifies integration into compact drivetrains-exactly the kind of packaging constraint you find in a tracked snow groomer, where the transfer case, hydrostatic pumps, and final drives all have to share tight real estate.

Key Design Characteristics

Bent-axis piston rotary group-An axial tapered piston rotor operating at a fixed angle to the drive shaft, which allows high power density in a small envelope.

Fixed displacement-Unlike variable motors (A6VM, A2FM variable-angle types), the A2FE has no adjustable swash or bent-axis angle, so displacement per revolution is constant. This gives predictable, stable speed and torque output for a given flow and pressure, ideal for constant-ratio track drives and fan drives.

Plug-in cartridge design-Ships as a complete, pre-assembled, and factory-tested unit that installs directly into the gearbox with no field configuration required.

Displacement range-Available across a wide size range (roughly 28 to 355 cm³/rev depending on series), letting engineers match motor size precisely to the torque and speed needs of a given axle or accessory drive.

Pressure capability-Nominal pressures up to 400 bar and peak pressures up to 450 bar on most sizes, with the largest frames rated slightly lower (around 350/400 bar).

Open or closed circuit operation-Compatible with both circuit types, which matters because Kässbohrer machines use closed-loop hydrostatic circuits for travel drive and open-circuit branches for implements like the tiller, blade, and winch.

How Output Speed and Torque Are Determined

Because displacement is fixed, the A2FE's behavior is governed entirely by the hydraulic system feeding it:

Output speed scales with the flow rate delivered by the drive pump.

Output torque scales with the pressure differential between the motor's high-pressure and low-pressure ports.

This relationship is what makes the A2FE so well suited to hydrostatic track drives: as the vehicle climbs a steeper slope or pushes a heavier load of snow, system pressure rises and torque increases automatically, without any mechanical shifting.

Why Kässbohrer Uses Rexroth A2FE Motors

Kässbohrer's PistenBully line has been built around hydrostatic drive since the 120 B model introduced it to the snow-grooming industry in the late 1960s, a shift away from mechanical transmissions that gave operators continuously variable, precise speed control instead of fixed gear ratios. That hydrostatic philosophy carries through the entire modern PistenBully range, and it's the reason bent-axis Rexroth motors like the A2FE show up throughout the driveline and implement circuits.

Typical Application Points on Kässbohrer Machines

Track (final) drives-Fixed motors deliver the torque multiplication needed at the drive sprockets, working in tandem with the vehicle's variable hydrostatic pumps.

Tiller drive-Snow tillers demand high, steady torque at relatively constant speed, which lines up well with a fixed-displacement motor's output characteristics.

Winch drive-on steep-terrain groomers, winch systems need reliable, repeatable torque for cable tension and recovery-another natural fit for the A2FE's predictable output.

Fan and cooling circuits-Some auxiliary drives use fixed motors for constant-speed cooling fans tied to hydraulic flow rather than engine RPM directly.

Rear implement carriers and blade actuation support-Larger PistenBully models rely on a broad hydraulic system (Kässbohrer's development work with valve suppliers explicitly covers plow blade, rear cutter, winch, and fan control circuits), and fixed motors are typically part of that architecture wherever constant-ratio drive is required rather than infinitely variable output.

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Q1: How do I know if my Kässbohrer machine's A2FE motor needs replacing versus rebuilding?

A1: Signs like declining track speed under load, excessive case drain flow or temperature, unusual noise from the gearbox area, or metal contamination in filtered fluid samples all warrant inspection. A qualified hydraulic technician can measure volumetric and mechanical efficiency to determine whether a rebuild (new rotary group, bearings, and seals) or full replacement is the more economical path.

Q2: Why does Kässbohrer favor hydrostatic drive with fixed motors instead of a mechanical transmission?

A2: Hydrostatic drive gives continuously variable speed control without shifting, which is critical for the precise, low-speed, high-torque maneuvering snow groomers need on variable terrain. Fixed motors provide predictable, robust torque delivery at specific drive points where a constant displacement ratio is sufficient, while variable pumps elsewhere in the circuit handle the overall speed and torque range.

Q3: What is the price and delivery time of the A2FE hydraulic motor for Bonfiglioli engineering 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 Bonfiglioli engineering machinery hydraulic motor?

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