USM mid-mount, rail-suspended mowers reduce load on tractor castings. Suspension and mounting systems protect tractor components from possible damage caused by cantilevered loads. Choose from 3 models. Require 2- or 4-wheel-drive tractors weighing over 8,000 lbs. and are equipped with at least 80-hp. engines that can directly drive a hydraulic-gear pump from the front end of the crankshaft. Ready-to-install kits are available for a variety of tractors.