E - Fixed Constructions – 02 – F
Patent
E - Fixed Constructions
02
F
138/62
E02F 3/32 (2006.01) E02F 3/22 (2006.01) E02F 9/22 (2006.01) F15B 11/16 (2006.01) F15B 11/17 (2006.01)
Patent
CA 1278978
HYDRAULIC SYSTEM FOR AN INDUSTRIAL MACHINE Abstract of the Disclosure An excavator has a number of different hydraulically powered functions that are controlled by a closed center hydraulic system that features a pair of variable displacement, engine driven hydraulic pumps, the displacement of which is responsive to the demands of the system. The flow to the various hydraulic motors is controlled by pilot operated load sensing control valves that direct fluid pressure to a load sensing line when one of the hydraulic motors in the system is being operated. The load sensing line is connected to the control system of the pumps to place the pumps in stroke when a flow of pressurized fluid is required. The flow of the load sensing pressure to the controls for one of the pumps can be optionally disconnected to place said pump in a standby condition and thereby reduce the flow capacity of the hydraulic system at the option of the operator.
557947
Johnson Steven Harold
Williams Lary Lynn
Borden Ladner Gervais Llp
Deere & Company
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