This type of drive unit is specially designed to drive wheels on graders in the 16 tonne class.
Drive is delivered by a cartridge type hydraulic motor. This design has been adopted for its minimal protrusion, permitting the entire unit to be housed inside the width of the tyre. This ensures excellent protection for the drive unit whatever the machine configuration, even in the most severe operating conditions.
In design terms the unit comprises a hub that houses a planetary gearbox with two reduction stages and a hydraulically operated multi-plate clutch.
The clutch can be engaged when the machine is stationary or moving. When the clutch is engaged, drive is transmitted to the wheel; when it is disengaged the wheel is idle.
A special drive pressure control system, connected to the hydrostatic transmission control system and to the main rear wheel drive, ensures smooth and safe engagement when the speed of the hydraulic motor matches that of the driven wheel. All aspects of control are managed by an electronic control unit.
The clutch is mounted on the final reduction