DAYCO part description

Features & Benefits

  • Maintains consistent belt tension to prevent slippage and component misalignment
  • Reduces wear on accessory drive belts for a longer lifespan
  • Heavy-duty construction withstands high torque and extreme operating conditions
  • Automatic tensioning eliminates the need for constant adjustments
  • Keeps alternators, compressors, and other belt-driven components working properly

Dayco Accessory Drive Belt Tensioner

Searching for a heavy-duty belt tensioner that will not let your accessory drive system fall apart? The Dayco Automatic Belt Tensioner is exactly what you need to keep belts running tight and components working in sync. If the belt is not under proper tension, alternators, water pumps, and compressors suffer, leading to expensive failures that could have been avoided. The Dayco 89934 is made for extreme-duty applications, so it is created to keep things aligned, reduce wear, and prevent slippage under load. 

Product Attributes

Type Automatic
Direction Counter Clock Wise
Belt Type Serpentine
Number of Pulleys 1
Pulley 1 Diameter 75 mm
Pulley 1 Flat N
Pulley 1 Number of Grooves 8
Pulley 1 Width 34 mm

Additional Information

Country of Origin (Primary) US
Harmonized Tariff Code (Schedule B) 8708998180
UPC 00036687996718

Part Interchanges

For over 100 years, Dayco® has been a world leader in the development, manufacture, and distribution of essential engine drive components for the aftermarket sector. Its catalog covers a wide range of drive system components for various applications, including automotive, truck, construction, agriculture, industrial machinery, and hybrid electric vehicles. For heavy duty trucks and buses, Dayco specializes in serpentine and V-belts, vibration dampers, thermostats, water pumps, expansion tanks, and gaskets. Dayco parts are built with durability in mind, using high-grade materials and tested in compliance with the latest standards set by the automotive industry. These result in parts that are superior in reliability, performance, and service life over the competition.

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