Removal of tractor wheel - using help wheel equipped with levers terminated with self-aligning friction pads

摘要

The `help' wheel (2) has a carrier frame (3) with several radial levers (7). Each lever is pivoted on its fulcrum (8) by the manually-operated arm (5) acting on a screw spindle (6). The inner surface of the tractor wheel rim (1) has a high friction or toothed ring (12) over virtually its entire circumference. The extremity of each lever has a self-aligning pad (14). Each pad has a high friction surface or is toothed to match the ring on the wheel rim. Two blocks (20) serve to position the ring against the rim and protect the inflator (19).