Idlers

Caterpillar Idlers Maintain Track Tension and Alignment

Caterpillar idlers are critical components located at the front of a tracked machine’s undercarriage, working alongside rollers, sprockets, and chains to deliver stable, efficient mobility. Their main function is to maintain proper track tension, which prevents slack or binding, reduces wear on the tracks and other undercarriage parts, and ensures smooth movement over all types of terrain. By guiding the track and absorbing shocks, idlers help distribute the machine’s weight evenly, improving stability, traction, and longevity of your equipment.

Each idler is engineered for specific Caterpillar models such as D3, D4, D5, D6, D7, D8, D9, D10, D11, and more ensuring a precise fit and reliable performance. High-quality construction, often with hardened steel and sealed bearings, withstands harsh conditions and minimizes maintenance. Regular inspection and timely replacement of worn or damaged idlers are vital to prevent track misalignment, uneven wear, and costly downtime.

Propel Parts offers a wide selection of high-quality replacement idlers for Caterpillar equipment. In addition, Propel Parts provides clear compatibility listings and fast shipping helping you keep your machines running smoothly and efficiently.

We offer idlers that are made of premium quality cast steel. Using state of the art technology, idlers undergo a special heat treatment that provides them with long durability and smoothness.