Track tensioning system for mobile vehicles, including lift cranes

摘要

A crawler (14, 16) has a track tensioning system (150). The crawler (14, 16) includes a crawler frame (43) having a bottom; at least one drive tumbler (100) supported on the frame (43); a track (50) made of a plurality of connected track shoes (52) and is wrapped around the drive tumbler (100) so that a plurality of the shoes (52) are in contact with the drive tumbler (100). The track tensioning system (150), mounted to the frame (43), includes a roller (162) engaging the inside surface of the track (50); and a roller positioning structure attached to the frame (43) that can raise the roller (162) relative to the bottom of the frame (43) to thereby increase the tension of the track (150).