Dayco 89448 Gold Label Heavy Duty Automatic Serpentine Belt Tensioner Assembly

The Dayco 89448 Gold Label Heavy Duty Automatic Belt Tensioner is engineered for demanding heavy-duty diesel engine applications. Designed to maintain proper serpentine belt tension, this automatic tensioner helps reduce belt slippage, noise, and premature component wear.

Featuring a heavy-duty cast aluminum construction and Dayco's patented flat spring design, the 89448 minimizes tension variations throughout the operating range. Its durable pulley assembly incorporates permanently lubricated bearings to provide dependable performance and extended service life.

Ideal for commercial trucks and heavy-duty equipment, the Dayco 89448 delivers reliable belt tension management under demanding engine operating conditions.

Technical Specifications

Cross Reference Part Numbers

Common Vehicle Applications

• Kenworth T660, T680, T800, T880, T700 and W900

• Peterbilt 367, 379, 386, 388, 389, 567 and 579

• Freightliner 114SD and 122SD

• International 9900i, 9900ix, HX520 and LT625

• Volvo VNL and VNM

• Mack CL and CXU

• Western Star 4900 Series and 6900XD

Applications vary by engine and model year. Verify fitment before ordering.