Abstract: A hydraulic system with dual pumps for tractor brake, steering, and loader valves wherein one of the pumps is connected directly with the tractor brake valve, and the system is arranged to have the hydraulic flow go from the brake valve to a pressure compensating valve which is connected with the steering valve, and the other pump is also connected with the pressure compensating valve and thus with the steering valve. As such, the output of both pumps can be directed to the steering valve and subsequently also to the loader valves which control the earth-handling bucket and clam and the like.

Abstract: A hydraulic load-sensing system including a pump, a valve, a load-responsive actuator, and a hydraulic pressure unloading valve, all hydraulically connected together. The outlet of the pump is directed to both valves, and a sensing port and hydraulic line exist between the two valves for communicating the hydraulic load pressure to the unloading valve and thereby establishing the pump outlet pressure. A biasing member is included in the unloading valve, and therefore a constant hydraulic pressure drop is established across the valve supplying fluid to the load-responsive actuator, and a pressure relief valve limits the outlet pressure of the pump.