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Caterpillar 301.5 301.6 301.8 Idler

Cat Idler 553-5510
Caterpillar 301.5 301.6 301.8 Idler
Buy replacement Caterpillar® 301.5 301.6 301.8 and 301.9 tension idlers online at Rubbertrax to save time and money. We will ship to your door and save you a trip to the expensive dealership.
SKU: 553-5510
Weight: 65 lbs
Make: Cat
Price: $189.00

Rubber tracks and wear parts are sold individually unless specified in the details. We offer fast shipping across the USA when you order online and ship to a commercial address. *Some restrictions apply.

226-4049 Idler Assembly

The 553-5510 is interchangeable for the 301.5 through the 302CR Caterpillar® mini excavator series listed below. This idler assembly is fully assembled with bushing and seals and arrives ready to be installed using your existing mounting brackets. This is the aftermarket tension idler designed for the following Caterpillar® mini excavator models:

  • Caterpillar® 301.5
  • Caterpillar® 301.6
  • Caterpillar® 301.8
  • Caterpillar® 301.9
  • Caterpillar® 301.7CR
  • Caterpillar® 302CR

This is the larger roller wheel that pushes out as you grease the tensioner to tighten the rubber track.


The idler is installed on the opposite side of the undercarriage from the sprocket.

OEM Part Numbers

  • Caterpillar® Dealer Part Number: 553-5510

Optional Part Availability

Verify your serial number as there are several idler options in this series depending on original setup.

Related Cat 301.5 301.6 301.8 Undercarriage