This is the replacement aftermarket tension idler for the Caterpillar 302.5 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. This idler is guaranteed to fit, please call us if you have any questions. The mounting arms (yokes) are nine and three quarter inches long and three inches wide. If your Cat 303.5 measurements match up this is the idler you need for your 303.5 as well. The 302.5 and 303.5 also have a ten and a half inch yoke option under part number 172-2017AM. Please verify your size.
This tension idler (140-4009) is known to fit:
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