Hydraulic weight transfer system for an implement with a lift as

Details Hydraulic weight transfer system for an implement with a lift as Hydraulic weight transfer system for an implement with a lift as

1988-02-16

1989-04-04

Johnson, Richard J.

Earth working

With actuator on trailing ground supported frame for moving...

Vertically

172445, 172448, A01B 6322

Patent

active

048177300

ABSTRACT:
An improved hydraulic circuit for raising and lowering a three-point hitch-mounted implement having a lift assist assembly and for selectively lowering the lower draft links of the three-point hitch to transfer implement weight to the rear wheels of the tractor without affecting the normal operation of the tractor operator control valve. A shuttle valve connects the rockshaft control valve, which otherwise would be disabled, to the rockshaft cylinder which controls the lower draft links. The ball-check valve also connects the rockshaft cylinder to the operator control valve while isolating the rockshaft control valve from the operator control valve.

REFERENCES:
patent: 3207233 (1965-09-01), Shumaker
patent: 3258075 (1966-06-01), Ashfield
patent: 3450220 (1969-06-01), Frandson et al.
patent: 3463510 (1969-08-01), Van Syoc
patent: 3542135 (1970-11-01), McCanse
patent: 3583495 (1971-06-01), Cantral et al.
patent: 4193458 (1980-03-01), Meinert et al.
patent: 4434857 (1984-03-01), Basrai
Operator's Manuel #OM-N200078 Issue I5 for John Deere 845 Series Folding Row-Corp. Cultivater.
U.S. patent application Ser. No. 07/101,873 filed 28 Sep. 1987 of Steve A. Junge et al., assigned to Deere & Company.

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