While visual layouts can vary slightly depending on whether you have a single or dual-belt setup (common in AC-equipped trucks), the standard C15 routing follows this general path:
Ultimate Guide to the Cat C15 Fan Belt Diagram and Replacement
Always look for the routing decal on the fan shroud or the underside of the hood before removing the old belt. If it's missing, take a quick photo with your phone! Signs Your C15 Belt Needs Replacement cat c15 fan belt diagram
Insert your breaker bar into the square hole on the automatic tensioner arm . Rotate it (usually counter-clockwise) to compress the spring and slacken the belt.
The water pump on a C15 is typically gear-driven from the front housing, not driven by the serpentine belt. This is a key difference from smaller engines. While visual layouts can vary slightly depending on
A spring-loaded arm that maintains constant pressure on the belt.
If the underside of the belt looks shiny or "burnt," it has been slipping and losing efficiency. Step-by-Step Replacement Guide Rotate it (usually counter-clockwise) to compress the spring
Disclaimer: This review is for informational purposes. Always consult your specific Caterpillar service manual (SERV) for the exact diagram related to your Engine Serial Number (ESN).
1/2" drive breaker bar or a dedicated tensioner tool, a new Cat-spec belt.
When installing a new belt, use this mnemonic to ensure you don't put it on backward (which will cause the water pump to spin the wrong way):