Abstract: A hydraulic system for a wheel loader having an implement arranged for elevational and tilting movements relative to a frame of the loader. The hydraulic system includes selectively operable lifting and tilting circuitry for adjusting the position of the implement and a shock absorbing mechanism arranged in combination with the lift circuitry for allowing relative movement between the implement and the frame to provide a cushioning effect which reduces pitching of the loader. To inhibit inadvertent vertical displacement of the implement, the shock absorbing mechanism is responsive to an initial lifting action of the implement. In a preferred form of the invention, the shock absorbing mechanism is responsive to hydraulic conditions indicative of imminent tilting movement of the implement thereby eliminating inadvertent vertical displacement of the implement when the implement reaches a limit of its tilting travel.

Abstract: An apparatus for holding the speed of an engine to a fixed level with provision for increasing engine speed above that setting without losing the set point. A combination of piston and cylinder assemblies are joined together to control engine speed. An equipment attendant pressurizes one end of a closed hydraulic system to activate a hydraulic operator to change engine speed. Shutting an isolation valve, hydraulically locks that speed setting into the engine. With the isolation valve shut, a biased, bypass piston and cylinder assembly is activated to increase engine speed. The bypass piston and cylinder assembly is actuated by the same device used by the equipment attendant to pressurize the hydraulic system control initially.