Abstract: Fluid is selectively, controllably delivered at substantially common rates from separate respective variable displacement pumps in response to a load pressure signal acting on a single pump control valve serving said pumps.

Abstract: A fluid system of a vehicle has means for reducing waste by separately controlling the maximum operating pressure of separate portions of the fluid system serving work elements of the vehicle.

Abstract: A hydraulic control valve body is pre-cored for selective adaptation to provide a first valve assembly having two independent circuits or a second valve assembly having a single circuit with either a series-parallel or interrupted series function.

Abstract: A load supporting hydraulic system having a pilot operated main control valve is provided with pilot controlled load check valve operative to permit free flow of fluid from said control valve toward the load supporting means of the system in response to pilot pressure and to block fluid flow from the load supporting means toward the control valve. The system includes valve means operative independent of the main control valve to permit the load check valve to be opened by fluid pressure in the load supporting means to allow fluid flow therefrom to the reservoir. The system further includes safety valve means for blocking fluid flow to pilot control means.