New undercarriage parts and rubber tracks are sold individually but we suggest replacing all of your worn parts at the same time.
This is the replacement aftermarket tension idler for the Caterpillar 302.5C mini excavator.
The tension idler installs on the opposite end of the undercarriage from the sprocket and this is the part that expands out as you pump the grease in the tensioner to tighten the rubber track.
Some people refer to this larger roller as the pulley.
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