Bypass system for electronically controlled implement lift

Details Bypass system for electronically controlled implement lift Bypass system for electronically controlled implement lift

1999-08-10

2000-10-10

Novosad, Christopher J.

Earth working

Draft, pitch or ground level responsive depth control

172311, A01B 63114

Patent

active

061291579

ABSTRACT:
An implement lift with a plurality of individual electrohydraulically controlled lift cylinders spaced on a tool frame includes a bypass system for facilitating continued implement operation in the event of a failure of the electronics or wiring. The system includes an electrically controlled valve at each cylinder normally operated by an electronic controller but manually lockable in an open position if there is a circuit failure so the operator can control the implement from the tractor selective control valve (SCV). Hydraulic hoses with quick disconnects compatible with both the tractor SCV connections and the main electrohydraulic valve on the tractor are connected to the tractor valve for normal automatic operation but can be easily rerouted to the SCV connections for control by the SCV when the cylinder valves are manually locked in the open position.

REFERENCES:
patent: 3663032 (1972-05-01), Hook et al.
patent: 5957218 (1999-09-01), Noonan et al.
Deere & Company, Technical Manual 1576, p. 270-25-48, publication date--Jul. 1, 1999, published in U.S.A.

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