Hydraulic draft control

Details Hydraulic draft control Hydraulic draft control

B - Operations, Transporting

60

P

138/80.11

B60P 1/16 (2006.01) A01B 63/112 (2006.01)

Patent

CA 1049894

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 mechanism. The control mechanism actuates a direction control valve for di- recting fluid to and from a hydraulic lift cylinder for respec- tively raising and lowering the draft link to adjust the imple- ment so as to maintain the preselected pressure and thus maintain the desired draft load.

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