Harvesters – Motorized harvester – With selective control of drive means
Reexamination Certificate
2011-08-23
2011-08-23
Pezzuto, Robert E (Department: 3671)
Harvesters
Motorized harvester
With selective control of drive means
C060S468000, C056S011900, C056S015600
Reexamination Certificate
active
08001751
ABSTRACT:
A method of gradually relieving pressure in a hydraulic system of a work machine, wherein a pump in fluid communication with the hydraulic system and a fluid reservoir, is operable for pressurizing fluid from the reservoir and pumping the pressurized fluid into the hydraulic system, wherein the pump is restrictive to fluid flow therethrough when not operating, and the hydraulic system includes at least one valve in fluid communication with the work element configured for receiving the pressurized fluid. The valve is controllably operable in at least two operating modes, including a first mode wherein the pressurized fluid can pass therethrough between the pump and the work element or elements, and a second mode wherein the fluid is prevented from passing between the pump and the work element. The method includes operating the valve or valves in the first mode for at least a predetermined time period while the pump is not operating, to allow at least some of any of the pressurized fluid in the work element to flow through the hydraulic system and gradually drain through the pump to the reservoir so as to reduce any pressure in the hydraulic system and the work element.
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Pulsafeeder. Metering with ECO Gear Pumps [Brochure]. ECO Gearchem.
Ehrhart Philip J.
Fackler Robert L
CNH America LLC
Harms Michael G.
Nguyen Mai
Pezzuto Robert E
Sheldrake Patrick M.
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