Dayco 89947 Heavy-Duty Automatic Belt Tensioner Assembly

The Dayco 89947 is a heavy-duty two-piece automatic belt tensioner engineered for superior durability and easier installation than original equipment, designed specifically for Class 8 trucks with DD13, DD15, and DD16 series engines. This tensioner is compatible with Freightliner models including Cascadia, 114SD, 122SD, Century Class, Columbia, Coronado, M2 112, and Sport Chassis, as well as Western Star and Van Hool vehicles.

Key Features:

• Flat spring technology allows for increased torque transmission to the belt when needed, compensating for stretch and wear while maintaining constant tension throughout belt life
• Two-piece design engineered to be more durable and easier to install than OEM, saving time and money
• Constructed with tough, long-lasting cast aluminum housings and arms, steel locator pins, and arm plates
• Features smooth pulley design
• Resolves belt squeal, improper tracking, and accessory operation issues

Engineered to outperform and outlast OEM parts, the Dayco 89947 tensioner provides reliable performance in demanding heavy-duty applications. The innovative two-piece construction simplifies the installation process while delivering enhanced durability for extended service intervals.

Replaces OEM Part Numbers: 4722001570