Hydraulic control apparatus for tractor

Details Hydraulic control apparatus for tractor Hydraulic control apparatus for tractor

1988-11-22

1990-02-27

Reese, Randolph A.

Earth working

Automatic power control

Draft responsive

172 7, 2804461, A01B 63112

Patent

active

049037790

ABSTRACT:
A hydraulic control apparatus for a tractor comprising a control valve for a hydraulic unit for a work device, a position control lever and a draft control lever for changing over the valve through position and draft link assemblies, a position feedback assembly, a draft feedback assembly for switching the valve to maintain the draft on the work device at an approximately constant value, and a position control spool operating arm and a draft control spool operating arm arranged above and below the spool of the valve in intersecting relation thereto, the draft feedback assembly being interlocked with the draft link assembly. The control valve is disposed under the case of the hydraulic unit, while the link assemblies are accommodated in a space inside one side wall of the case and having an open lower side to make the apparatus easy to assemble.

REFERENCES:
patent: RE25512 (1964-01-01), Presnell et al.
patent: 3123152 (1964-03-01), Biskis
patent: 3294179 (1966-12-01), Bunting et al.
patent: 3331447 (1967-07-01), Simak
patent: 3489224 (1970-01-01), Bunting
patent: 3653446 (1972-04-01), Kalmon
patent: 3901323 (1975-08-01), Mueller, Jr.
patent: 4085806 (1978-04-01), Osujyo et al.
patent: 4418758 (1983-12-01), Fujimoto
patent: 4463658 (1984-08-01), Heiser et al.
Gotz, Werner, "Hydraulics, Theory and Applications, From Bosch," 1984, pp. 340-342.

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