DAYCO part description

Product Description

AUTOMATIC BELT TENSIONER, HD, DAYCO

Features & Benefits

  • Maintains optimal belt tension for efficient power delivery to your engine's accessories
  • PTFE string dampens noise for a smoother and more enjoyable driving experience
  • With "flat spring" design that reduces tension variations, safeguarding bearings against excessive wear during belt break-in
  • Shields the engine's accessories from early deterioration, thereby lowering repair and maintenance expenses

Dayco Automatic Belt Tensioner

The Dayco Automatic Belt Tensioner eliminates the guesswork from maintaining optimal engine performance. This intelligent component automatically regulates belt tension, ensuring a smooth flow of power to your engine's vital accessories. Dayco's secret lies in its patented "flat spring" mechanism that minimizes tension fluctuations, a major cause of premature wear on accessory bearings during new belt installations. An embedded PTFE string within the spring further enhances the system by providing superior abrasion resistance for the belt and dampening noise for a quieter operation. Manufactured with unwavering commitment to longevity, the Dayco 89440 boasts a weatherproof construction that repels harsh elements and extreme temperatures.

Product Attributes

Type Automatic
Direction Counter Clock Wise
Belt Type Serpentine
Number of Pulleys 1
Pulley 1 Diameter 74 mm
Pulley 1 Flat Y
Pulley 1 Width 57 mm

Additional Information

Country of Origin (Primary) US
Harmonized Tariff Code (Schedule B) 8708998180
UPC 00036687422132

Part Interchanges

DAYCO 89440 Cross Reference

We have 3 alternatives for the 89440 by DAYCO:

Fits Vehicles

  • Peterbilt 385 (2003-2008)
  • Peterbilt 320 (2011)
  • Peterbilt 365 (2008, 2011)
  • Autocar LLC. Xpeditor (2010-2013)
  • Kenworth W990 (2019-2022)
  • Kenworth C500 (2003-2016)
  • Peterbilt 357 (2004-2007)
  • Freightliner Argosy (2008)
  • Freightliner Columbia (2009)
  • Freightliner 122SD (2013-2019)
  • International 5900i (2004-2008, 2012, 2014-2017)
  • International HX520 (2018-2022)
  • International LT625 (2017-2022)
  • International HX620 (2017-2022)
  • Western Star 6900XD (2012, 2015-2016)
  • Volvo VT (2006-2010)
  • International 9900ix (2004-2009)
  • International 9900i (2003-2012, 2014-2018)
  • Volvo VNM (2007)
  • Volvo VNL (2003-2022)
  • Western Star 4900EX (2005, 2008-2009, 2011-2021)
  • Western Star 4900SA (2008-2021)
  • Western Star 4900FA (2007-2009, 2011-2021)
  • Mack CL (2004-2007)
  • Peterbilt 587 (2011-2018)
  • Kenworth T700 (2011-2015)
  • Peterbilt 579 (2013-2023)
  • Peterbilt 389 (2008-2023)
  • Kenworth T880 (2014-2023)
  • Kenworth T680 (2013-2022)
  • Peterbilt 387 (2004-2011)
  • Kenworth T2000 (2004-2011)
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  • Peterbilt 367 (2008-2021)
  • Kenworth T660 (2008-2018)
  • Kenworth T600A (2004-2007)
  • Peterbilt 378 (2003-2007)
  • Peterbilt 567 (2014-2023)
  • Peterbilt 379 (2003-2007)
  • Kenworth W900 (2005-2022)
  • Kenworth T800 (2004-2015, 2017-2022)
  • Freightliner Classic (2009)
  • Freightliner Century Class (2008-2009)
  • Freightliner Coronado (2009, 2011-2016)
  • Freightliner Cascadia (2009-2024)
  • International LoneStar (2009-2012, 2014-2017, 2019-2023)
  • International ProStar (2008-2017, 2019)
  • International 5600i (2004-2011)
  • International 9400i SBA (2003-2010)
  • International 9200i SBA (2003-2008)
  • International 5500i (2003-2011)
  • Freightliner FS65 (1998-2004)
  • Sterling Truck LT9500 (2008)
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  • Country Coach Motorhome Affinity (2006, 2008)

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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