Komatsu D85EX-15 Dozer (Track) - KM4456
IDLER GROUPToggle Descriptions
The front idler serves as a guiding support for the track chain. The idler is spring-loaded and mounted on slides, or guides, that allow it to move back and forth inside the track frame, as the machine passes over uneven ground. The spring-loading effect causes the idler to maintain the desired tension regardless of operating conditions.