Cat 303.5 303CR Rear Idler

Our Products: Cat Mini Excavator > Caterpillar 303CR
SKU: 172-2100
Weight: 52 lbs
Buy aftermarket Cat mini excavator parts for your 303.5 and 303CR online at Rubbertrax and save versus going to your local dealer. Our parts are guaranteed to fit. This idler wheel is designed for the Cat 303.5 and 303CR models. Parts may vary for sub models.
Price: $475.00
Please visit Rubbertrax.com for online checkout.
172-2100 Cat 303.5 Idler
Cat 303.5 303CR Rear Idler
172-2100 Cat 303.5 Idler
Cat 303.5 303CR Rear Idler
172-2100 Cat 303.5 Idler
Cat 303.5 303CR Rear Idler
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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 aftermarket replacement rear idler for the following Cat mini excavators:

  • Cat 303.5
  • Cat 303CR

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.


Alternate Part Number:
Caterpillar dealer part number: 172-2100
Alternate Models:
Caterpillar: 303.5, 303CR
Alternate Part: There are no known alternate part listings. This idler is guaranteed to fit.

Cat 303.5 Undercarriage


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