Dayco 89449 | Accessory Drive Belt Tensioner Assembly

Part Number
Accessory Drive Belt Tensioner Assembly

Fits: 98-03 Mack CH, 98-99 Mack CL, 98-99 Mack CX, 98-02 Mack RB, 98-03 Mack RD, 01-02 Mack CL, 01-02 Mack CX, 99-02 Mack MR, 00-02 Mack DM, 00-02 Mack DMM, 01-07 Mack CV, 02 Mack LE, 04-05 Mack LE, 04-07 Mack CHN, 05 Mack CT, 06 Mack CXP

Special Price $77.34 Regular Price $90.99
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As the major supplier to heavy duty original equipment manufacturers, this Dayco® No Slack® Heavy Duty Tensioner is guaranteed to be engineered and manufactured to the strictest design specifications. The heavy-duty cast aluminum body and pulley arms translate into extra strength and durability. This Dayco® Heavy Duty® Tensioner features a patented “flat spring” design that's engineered to handle the higher torque and power pulses exerted by today's diesel engines. Rugged pulleys with double lifetime lubricated bearings deliver long lasting, dependable service. In addition, this Dayco® Heavy Duty Tensioner features an “extremely damped” design using a wave spring and a metal ring with a bonded rubber surface to act as a “radial shock absorber” for the tensioner arm.

BRAND: Dayco




Belt TypeSerpentine
DirectionCounter Clock Wise
Number of Pulleys1
Pulley 1 Diameter74
Pulley 1 FlatY
Pulley 1 Width46.27



  • Dynacraft: D1186-2601
  • Mack: 87GB41
  • ACDelco: 38523
  • Goodyear: 49530
  • Duralast: 89449
  • NAPA: 38523
  • Mack: 87GB41B
  • Litens: 910008
  • Mack: 87GB41A
  • CARQUEST: 38523
  • Mack: 87GB41C
  • Mack: 20851217
  • Gates: 38523
  • SKF: VKM910008


  • 1998-1999 Mack CL - Position: Fan and Alternator
  • 2006-2007 Mack CHN - Position: Fan
  • 2004-2007 Mack CV - Position: Fan
  • 2001-2002 Mack CL - Position: Fan and Alternator
  • 2002-2002 Mack LE - Position: Fan and Alternator
  • 2006-2006 Mack CXP - Position: Alternator and Air Conditioning
  • 2001-2003 Mack CV - Position: Fan and Alternator
  • 1999-2002 Mack MR - Position: Fan and Alternator
  • 2000-2002 Mack DM - Position: Fan and Alternator
  • 2001-2002 Mack CX - Position: Fan and Alternator
  • 1998-2002 Mack RB - Position: Fan and Alternator
  • 2000-2002 Mack DMM - Position: Fan and Alternator
  • 1998-2003 Mack CH - Position: Fan and Alternator
  • 1998-1999 Mack CX - Position: Fan and Alternator
  • 1998-2003 Mack RD - Position: Fan and Alternator
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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