A track vehicle driven by a track link (fig 2A, 203) and a frame 613 to support the track (204) having a drive assembly 611 adjacent the frame to drive the link (203); the assembly (211) comprising an outer flange (206) and inner sprocket (202) which engages with the track link (203); having a gap between flange (206) and sprocket (202) which is susceptible to build up of mud/debris, and a clearing member 610 extending into the gap (205), which is mounted on the frame adjacent the drive assembly to clear or scrape off mud or debris. Other important features may also include the clearing member is attached to the mounting member in a manner such that it adjustably extends into the gap, further, the clearing member is welded to a non-stress point of the track frame.
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