The serpentine belt is one of the most important engine system parts that powers the alternator, power steering pump, air conditioning compressor and water pump. Idler/pulleys are complimentary components that provide tension and help guide the drive belt. Without these parts working in peak performance, a ripple effect of problems will occur throughout the entire engine system.

This Automatic belt tensioner is designed for heavy-duty vehicles. It contains 1 pulley, flat, with a width that measures 46.3 millimeters. Its pulley diameter measures 74 millimeters. Lastly, it’s rotation moves Counter Clockwise.

Best fitment type: Mack CXU vehicles.

This product comes with a 24 months/150,000 miles warranty.

Dayco has provided customers with quality engine system parts for over 100 years. Dayco is best known for innovative products including their Gold Label® serpentine belts and No Slack® automatic belt tensioners and pulleys. When shopping for replacement engine system components for your heavy-duty truck, choose to buy from Dayco, quality that moves trucks forward!




  • 1 pulley, flat
  • Width that measures 46.3 millimeters
  • Pulley diameter measures 74 millimeters
  • Rotation moves Counter clockwise
  • Best fitment type: Mack CXU vehicles



Automatic belt tensioner

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