Patent ID: 6820699
Filing Date: 2004-11-23
Classification: A01B

Abstract:
An apparatus for controlling positions of at least a portion of an implement and a first marker, both of which are associated with a work vehicle, the apparatus comprising:a hydraulic circuit coupled to a first cylinder that governs the position of the first marker; a first hydraulic valve coupled to a second cylinder that governs the position of the portion of the implement and also coupled to a first port of the hydraulic circuit; and a second hydraulic valve coupled to a second port of the hydraulic circuit; wherein the hydraulic circuit is configured to isolate the first port of the hydraulic circuit from secondary hydraulic pressure supplied to the second port by way of the second hydraulic valve, and further configured to isolate the primary port of the hydraulic circuit from primary hydraulic pressure supplied to the first port by way of the first hydraulic valve; and wherein the primary hydraulic pressure is capable of producing changes in the positions of both the portion of the implement and the first marker in a coordinated manner, and the secondary pressure is capable of producing changes in the position of the first marker independently of the position of the portion of the implement.