Active implement down force system providing reduced heat...

Details Active implement down force system providing reduced heat... Active implement down force system providing reduced heat...

2008-09-29

2011-11-15

Leslie, Michael (Department: 3745)

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

C091S031000, C091S420000

Reexamination Certificate

active

08056465

ABSTRACT:
A line connects the tractor hydraulic power beyond supply to the pressure reduction valve that is connected to the implement cylinder ends and automatically controls implement down pressure. Fluid under pressure is supplied from a line independently of the tractor selective control valve during automatic down pressure mode operation, the selective control valve can be positioned in a float mode when the down force circuit is controlling implement down pressure. The circuit eliminates a stall signal from the selective control valve to the hydraulic pump that otherwise would cause the pump to rise to the high, heat-producing stall pressure if the selective control valve operated in an active pressure mode.

REFERENCES:
patent: 6378619 (2002-04-01), Mayerle et al.
patent: 7401465 (2008-07-01), Emmert et al.
patent: 7918285 (2011-04-01), Graham et al.

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