The Caterpillar C15 engine is widely regarded as a workhorse in the trucking and heavy equipment industries, but its belt system often comes up in maintenance "reviews" and discussions due to specific wear patterns. Common Performance Insights While there isn't a single formal "review" of a diagram, expert feedback from The Diesel Store and technicians on JustAnswer highlights several critical points for owners: Premature Wear Issues

: Inspect the lower right idler pulley , as this is a frequent failure point that can damage the mounting point if it fails while driving.