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Komatsu PC78US PC88MR Sprocket

21W-27-41110 Komatsu Sprocket
Rubbertrax
Komatsu PC78US PC88MR Sprocket
Buy aftermarket replacement sprockets for your Komatsu PC78US and PC88MR mini excavator online. This is the fourteen bolt-hole version with a guaranteed fit for the models listed below. This sprocket qualifies for free shipping when you order online.
SKU: 21W-27-41110
Weight: 40 lbs
Make: Komatsu
Shipping: Fast and Free!
List Price: $254.00
Price: $205.00
You Save: $49.00 (19%)

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

21W-27-41110 Sprocket specifications:

This is an aftermarket replacement drive sprocket for Komatsu models PC78MR-6 through PC88MR-10 mini excavators as specified below. This is a fourteen bolt-hole sprocket, also known as Komatsu part number: 21W-27-41110.

  • 19 Drive Teeth
  • 14 Drive Motor Bolt Holes
  • Inside Diameter: confirm
  • Outside Diameter: 19 inches

Alternate Models

This sprocket (21W-27-41110) is known to fit:

  • Komatsu PC78MR-6
  • Komatsu PC78US-6
  • Komatsu PC78US-8
  • Komatsu PC78UU-6
  • Komatsu PC88MR-6
  • Komatsu PC88MR-8
  • Komatsu PC88MR-10
  • Komatsu PC138

Use the appropriate torque requirement during installation set by Komatsu to avoid damage to the drive sprocket or travel motor. Sprockets and rubber tracks should always be changed together at the same time to maximize the lifespan of your undercarriage parts.


Please include the serial number for your mini excavator when purchasing so we can double-check to make sure you have selected the correct sprocket. Rubbertrax also offers rubber tracks and additional undercarriage parts for the Komatsu mini excavators.

Alternate Part Numbers

  • Komatsu Dealer Part Number: 21W-27-41110

Optional Part Availability

This is a guaranteed fit for the specific models listed. No alternate sprocket is available.

Quality Komatsu Parts

Smaller sprockets for Komatsu mini excavators are hardened in a one-step procedure via electrical induction. This increases the depth of the hardness through the teeth while preventing breakage. Our aftermarket sprockets are hardened within millimeters of the original OEM sprocket, providing great value for our customers overall. We recommend installing by hand to your manufacturer's suggested torque specifics.