Caterpillar Aftercooler Core 6I-1221 is a aftercooler product that cools compressed intake air to support efficient engine operation. It is listed for Caterpillar heavy-equipment applications; use part number 6I-1221 as the primary identification reference.
- Part Number: 6I-1221
- Brand: Caterpillar
- Product Category: Aftercooler
- Equipment Type: Articulated Truck, Wheel Tractor, Excavator, Industrial Engine, Wheel Scraper, Motor Grader
- Compatible Models: D20D, D250D, 613C II, M325B, 3116, 613C, 325 LN, 322B L, 325-A LN, 325B LN, 325-A L, 325-A FM L, 325B L, 322C FM, 322B, 322C, 325-A, 325 L, 322B LN, 325B, 120H, 135H NA, 120H ES, 135H, 120H NA
- 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.





