Hydraulic draft control

Details Hydraulic draft control Hydraulic draft control

A - Human Necessities

01

B

97/119

A01B 63/112 (2006.01)

Patent

CA 1042259

HYDRAULIC DRAFT CONTROL Abstract of the Disclosure The lower draft link of a tractor three-point hitch includes a sensor to sense draft loads imposed on the draft link by an earth-working implement. Variations in the draft load cause var- iations in the pressure of the fluid in the sensor from a prese- lected pressure. A pilot-operated, load control valve is connec- ted to the sensor and is shiftable in response to pressure above and below the preselected pressure to actuate a control mechan- ism. The control mechanism actuates a direction control valve for directing fluid to and from a hydraulic lift cylinder for respectively raising and lowering the draft link to adjust the implement so as to maintain the preselected pressure and thus maintain the desired draft load.

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