Patent ID: 6041583
Filing Date: 2000-03-28
Classification: A01D,Y10S

Abstract:
In a harvester adapted for forward movement over a field of plants, the harvester including a high capacity head for simultaneously removing the crop from numerous transversely spaced plants, the head having transversely spaced first and second ends, and operable cylinder structure for raising and lowering the head, a height control system comprising:first and second height sensing shoes connected adjacent the respective first and second ends;first and second closed center hydraulic valves connected to a source of hydraulic fluid on the harvester and to the first and second height sensing shoes, respectively, for movement between raise, lower and neutral positions;a shuttle valve connected between the first and second closed center hydraulic valves and the cylinder structure, the shuttle valve operating the cylinder structure to raise the head when either or both of the closed center hydraulic valves are in the raise position.