Caterpillar Track Sprocket 139-4304 is a sprocket product that transfers final-drive torque into the track chain. It is listed for Caterpillar heavy-equipment applications; use part number 139-4304 as the primary identification reference.
- Part Number: 139-4304
- Brand: Caterpillar
- Product Category: Sprocket
- Equipment Type: Mini Excavator
- Compatible Models: 301.8C, 301.6C, 301.5
- Engine Models: Confirm by equipment serial number
- Condition: New
Fitment can vary by machine configuration and serial-number range. Compare the original part number, dimensions, connectors and mounting points before purchase.





