Abstract: A hydraulic synchronizer for a plurality of hydraulic actuators has at least a pair of hydraulic fluid-holding chambers of variable fluid-holding volume. The synchronizer has a number of separate preferred features, each of which is optional depending upon the intended application of the synchronizer. These optional preferred features include an improved fluid passageway arrangement, a pneumatic pressure source, separate relief valves associated with each chamber, the capability to accommodate hydraulic fluid-holding chambers of different fluid-holding volumes concurrently, and the capability to detachably interconnect multiple synchronizer modules.

Abstract: A portable vehicle servicing lift includes a trailerable frame which pivotally mounts a pair of transport wheels arranged to be moved between an extended transporting position and a retracted position in which the frame connected thereto is lowered to the ground or other support surface. The frame also mounts a pair of vehicle ramps adjacent one end by a fixed fulcrum associated with the frame, and at the opposite end by a hydraulic piston-cylinder pivotally interconnecting the ramps and the frame for movement of the ramps about the axis of the pivot fulcrum. The frame includes a pair of trolley rails mounted to the frame between the transport wheels, the trolley rails configured to guidingly support a chair assembly and other equipment associated with automotive repair for movement along the full length of the frame.