This is the replacement aftermarket tension idler for the following Caterpillar mini excavators:
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.
For the 302.4D model you must verify size, alternate option 379-2885.
This idler assembly (386-0728, 385-4353) is known to fit:
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