A milling machine includes a frame, a housing, a milling drum mounted on the frame within the housing and a drive assembly. A positioning assembly is provided for moving the drive assembly between a first position which is laterally outside the periphery of the machine housing and a second position which is laterally inside the periphery of the machine housing, and for locking the drive assembly in at least the first and second positions without requiring the operator to manually manipulate a locking pin.

Provided herein is a driving apparatus for transporting a loaded object, which allows a drive-wheel to always be in contact with the ground even when the ground is uneven. The driving apparatus includes a loading plate (140, 240) on which a loaded object is loaded, a first support (110, 210) connected to a lower portion of one side of the loading plate (140, 240), a second support (120, 220) connected to a lower portion of the other side of the loading plate (140, 240), a hinge (130, 230) configured to connect the first support (110, 210) to the second support (120, 220) in a hinge structure, at least a pair of drive-wheels (160, 260) coupled to both sides of a lower portion of the second support (120, 220), and a driver configured to rotate and drive the drive-wheels (160, 260).

A vehicle having a front axle with a pair of front wheels having a track width adjustable between a wide track and a narrow track; a rear axle with at least one rear wheel; a steering wheel configured to control the turn of the rear wheel when the front wheels are set to the narrow track; track width control configured to change the track width of the front wheels and to change the wheel base between the front axle and the rear axle such that for the wide track of the front wheels the wheel base is longer than for the narrow track of the front wheels; a locking mechanism configured to lock the track width; wherein each of the front wheels is connected to a dedicated front wheel motor for driving that front wheel and to a dedicated front wheel brake for braking that front wheel.

Provided herein is a driving apparatus for transporting a loaded object, which allows a drive-wheel to always be in contact with the ground even when the ground is uneven. The driving apparatus includes a loading plate (140, 240) on which a loaded object is loaded, a first support (110, 210) connected to a lower portion of one side of the loading plate (140, 240), a second support (120, 220) connected to a lower portion of the other side of the loading plate (140, 240), a hinge (130, 230) configured to connect the first support (110, 210) to the second support (120, 220) in a hinge structure, at least a pair of drive-wheels (160, 260) coupled to both sides of a lower portion of the second support (120, 220), and a driver configured to rotate and drive the drive-wheels (160, 260).

A vehicle having a front axle with a pair of front wheels having a track width adjustable between a wide track and a narrow track; a rear axle with at least one rear wheel; steering means configured to control the turn of the rear wheel when the front wheels are set to the narrow track; track width control means configured to change the track width of the front wheels and to change the wheel base between the front axle and the rear axle such that for the wide track of the front wheels the wheel base is longer than for the narrow track of the front wheels; a locking mechanism configured to lock the track width; wherein each of the front wheels is connected to a dedicated front wheel motor for driving that front wheel and to a dedicated front wheel brake for breaking that front wheel.

An undercarriage for an agricultural machine includes a hollow axle, and a stub axle slidably received within the hollow axle. A lock arrangement locks a longitudinal position of the stub axle relative to the hollow axle. At least one shim is positioned at an outboard end of the hollow axle to adjust the distance between said stub axle and said hollow axle.

A milling machine includes a frame, a housing, a milling drum mounted on the frame within the housing and a drive assembly. A positioning assembly is provided for moving the drive assembly between a first position which is laterally outside the periphery of the machine housing and a second position which is laterally inside the periphery of the machine housing, and for locking the drive assembly in at least the first and second positions without requiring the operator to manually manipulate a locking pin.