Bosch Rexroth A4VG axial piston hydraulic pump for the Kassbohrer snow groomers 8.048.309.000.0 8.048.325.000.0 8.048.370.000.0 8.048.405.000.0 8.048.435.000.0

The A4VG is a variable-displacement axial piston pump of swashplate design, built for closed-circuit hydrostatic transmissions. Its output flow is proportional to drive speed and displacement, and it is infinitely variable, so flow direction reverses smoothly as the swashplate passes through neutral.

In a groomer, that means the operator can move from forward to reverse without a clutch or gearshift. The pump swings over centre, and the track motor reverses with it.

Why a Hydrostatic Closed Circuit Suits a Snow Groomer

Two tracks, one joystick

PistenBully highlights the hydrostatic drive as a comfort feature not often found on work vehicles, with precise steering and single-hand operation of attachments. That feel comes from independent, infinitely variable control of each track. A closed-circuit pump-and-motor pair per side gives you fine creep speeds for tight terrain work and a big reserve of torque for slopes.

Load on a slope

Groomers spend much of their life at high differential pressure: uphill, blade down, tiller engaged. A closed circuit keeps the oil circulating between pump and motor, so you get direct braking through the loop when descending. It also avoids the losses of an open-circuit valve stack, and the pump can be sized around torque rather than peak flow.

Features That Matter on Snow

Built-in protection

The A4VG carries a lot of its own safety hardware:

Two pressure-relief valves on the high-pressure ports protect the pump and motor from overload, and these valves also act as boost valves.

An integrated boost pump serves as both feed pump and control-oil pump, with its maximum pressure limited by a built-in boost relief valve.

An integral pressure cut-off is standard.

The cut-off matters on slopes. When the machine stalls against a snow bank, it keeps pressure spikes from hammering the loop.

Control options

Rexroth offers many control devices. Common codes include HW (hydraulic, mechanical servo), HD (pilot-pressure related), EP (electro-proportional) and DA (drive-dependent). With a DA control valve, the pump supports automotive operation for travel drives. For a groomer, that is the difference between a machine that lugs and stalls the engine and one that manages load smoothly.

Through-drive

Many A4VG variants accept a through-drive for a second pump. That's how manufacturers stack a travel pump and an auxiliary pump on a single engine output in a compact package.

For more brands and equipment models, please visit https://www.baolilaihydraulic.com/brand/

Q1: Does the Kässbohrer PistenBully use the Bosch Rexroth A4VG?

A1: It depends on the model and year. The A4VG is a common closed-circuit pump in mobile machinery, but confirm fitment from your pump nameplate and the vehicle's parts catalogue.

Q2: What's the difference between A4VG Series 32 and Series 40?

A2: Series 32 is rated at 400 bar nominal in sizes 28–250. Series 40 is rated at 450 bar nominal in sizes 45–280. They are not always drop-in interchangeable, so check port and mounting details.

Q3: What is the price and delivery time of the A4VG hydraulic pump for the Kassbohrer snow groomers?

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

Q4: How do I purchase an A4VG hydraulic pump for Kassbohrer snow groomers?

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