Dayco 89485 | Accessory Drive Belt Tensioner Assembly

Part Number
Accessory Drive Belt Tensioner Assembly

Fits: 98-05 Freightliner FLD120, 99 Freightliner Century Class, 01-04 Freightliner Century Class, 01-04 Freightliner Columbia, 01-03 Freightliner FB65, 01 Freightliner FLD112, 01 Freightliner FLD132, 01-04 Peterbilt 387, 05-06 Freightliner FB65, 03-05 Freightliner FLD132, 03 Country Coach Motorhome LEXA, 03-04 Freightliner Classic, 03-04 Freightliner Coronado, 03 Kenworth T800, 03 Kenworth W900, 03-07 Peterbilt 379, 04 Country Coach Motorhome Magna

Special Price $117.89 Regular Price $130.99
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Dayco® No Slack® Automatic Belt Tensioners are built to outperform and outlast competitive OE parts. This specific Dayco® Automatic Belt Tensioner is manufactured with a specially coated patented flat wire spring to allow the internal tension to be concentric, thus providing a more even degree of constant tension. The heavy duty cast aluminum spring case resists cracking and fatigue. Each component is built to resist rust, endure the toughest of conditions while promoting quieter performance and longer life.

BRAND: Dayco




Belt TypeSerpentine
DirectionCounter Clock Wise
Number of Pulleys1
Pulley 1 Diameter74
Pulley 1 FlatY
Pulley 1 Width39.25



  • Saab: 1493670
  • Freshstart: 49502
  • Foden: 36-00531-000
  • Saab: 1371788
  • Freightliner Trucks: DCO90-727000
  • Gates: 38508
  • Duralast: 89485
  • Case Tractor: 87409564
  • Goodyear: 49502
  • Litens: 910017
  • NAPA: 38508
  • Case Tractor: J945849
  • Four Seasons: 45833
  • Dynacraft: D1186-2458
  • CARQUEST: 38508
  • ACDelco: 38508


  • 2001-2004 Freightliner Century Class - Position: Air Conditioning
  • 2001-2003 Freightliner Columbia - Position: Air Conditioning
  • 2004-2004 Country Coach Motorhome Magna - Position: Air Conditioning
  • 2003-2003 Peterbilt 379 - Position: Air Conditioning
  • 2001-2004 Peterbilt 387 - Position: Air Conditioning
  • 1999-1999 Freightliner Century Class - Position: Fan and Alternator
  • 2003-2003 Kenworth T800 - Position: Air Conditioning
  • 2002-2005 Freightliner FLD120 - Position: Air Conditioning
  • 2003-2003 Freightliner Coronado - Position: Air Conditioning
  • 2000-2001 Freightliner FLD120 - Position: Fan and Air Conditioning
  • 2003-2003 Kenworth W900 - Position: Air Conditioning
  • 1998-1999 Freightliner FLD120 - Position: Fan and Alternator
  • 2004-2004 Freightliner Classic - Position: Air Conditioning
  • 2001-2001 Freightliner FLD112 - Position: Fan and Air Conditioning
  • 2001-2001 Freightliner FLD132 - Position: Fan and Air Conditioning
  • 2003-2003 Country Coach Motorhome LEXA - Position: Air Conditioning
  • 2003-2005 Freightliner FLD132 - Position: Air Conditioning
Customer Questions
Can a serpentine belt cause smoke?
Yes, a serpentine belt can cause smoke. A serpentine belt is an essential component of a vehicle's engine system. It drives various accessories such as the alternator, power steering pump, water pump, and air conditioning compressor. If the serpentine belt becomes worn, damaged, or misaligned, it can cause friction and generate smoke.
Why is my serpentine belt squealing?
The serpentine belt can squeal due to various reasons, including tension issues, worn-out belt, or a problem with the belt's pulleys.
Is my serpentine belt too tight?
If your serpentine belt is causing issues like excessive noise or accelerated wear on the pulleys, it may indicate that the belt is too tight.
Why did my serpentine belt come off?
Serpentine belts can come off due to factors such as belt wear, improper tension, misaligned pulleys, or a faulty tensioner.
Please, mind that only logged in users can submit questions

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