Hydraulic system with dual pumps for tractor brake, steering, and loader valves
AssigneeJ. I. Case Company
InventorDonnell Lynn Dunn
Life of this patent
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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.
Claims7
A hydraulic system with dual pumps for tractor brake, steering, and loader valves, comprising two hydraulic pumps, a hydraulic brake valve having a hydraulic flow-through passageway leading into and out of said brake valve and being hydraulically connected with one of said pumps, a pressure compensating valve having a hydraulic inlet and two hydraulic outlets, a hydraulic connection hydraulically interconnected between the other of said pumps and said pressure compensating valve inlet, an additional hydraulic connection interconnecting the outlet side of said brake valve flow-through passageway and the first mentioned hydraulic connection interconnecting the other of said pumps and said pressure compensating valve inlet for hydraulic flow from said brake valve and said other pump to said pressure compensating valve and thereby direct the flow of both said pumps to said pressure compensating valve, a hydraulic steering valve hydraulically connected with one of said outlets of said pressure compensating valve, a hydraulic pilot line hydraulically connected between said steering valve and said pressure compensating valve for hydraulically setting the latter in accordance with hydraulic pressure in said steering valve for directing hydraulic flow relative to said two outlets, and a loader valve hydraulically connected with the other of said outlets of said pressure compensating valve for receiving hydraulic flow from said pressure compensating valve.
Dependencies are inferred from the claim text.