Pitch control system

Details Pitch control system Pitch control system

E - Fixed Constructions

02

F

E02F 3/815 (2006.01) E02F 3/76 (2006.01) E02F 3/84 (2006.01) E02F 3/85 (2006.01)

Patent

CA 2334570

A pitch control system for a bulldozer having a bulldozer blade that is mounted to a blade linkage. The bulldozer blade is coupled to the blade linkage by a bearing that permits the right and left angling movement of the bulldozer blade and the forward and rearward pitch of the bulldozer blade relative to the blade linkage. An angling control valve hydraulically positions two hydraulic angling cylinders for angling the blade right and left relative to the blade linkage. A hydraulic dump valve is hydraulically positioned between the angling hydraulic control valve ;end the hydraulic angling cylinder, the hydraulic dump valve having a dump position and a checked position. A linear actuator in the form of a hydraulic pitch cylinder is operatively positioned between the blade linkage and the blade for selectively adjusting the pitch of the blade relative to the blade linkage. A pitch control valve is used to selectively position the pitch cylinder. The dump valve is shifted to its dump position whenever the pitch cylinder is extended or retracted thereby freeing the angling cylinders.

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