In crawler units, the drive sprockets are located on the rear axle in the direction of travel. When reversing, track wear is higher because the load on the track chain is increased by the longer tight span over the idler sprocket. Long periods of reverse travel therefore considerably accelerate wear on crawler unit components. During forward travel without milling, the shorter tight span reduces the load on the crawler unit parts. This means that crawler unit wear can be kept to a minimum by using forward travel when relocating the machine.