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Western Star 4900 Belt Tensioner

4 items

Find an A-Premium belt tensioner for squealing, slipping or uneven belt wear. Browse drive belt tensioners and pulley assemblies for your vehicle.

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Belt Tensioner with Pulley for International Harvester 5500i FreightlinerBelt Tensioner with Pulley for International Harvester 5500i Freightliner
A-Premium®Part # APBT0330
Belt Tensioner with Pulley for International Harvester 5500i Freightliner
4.5176 Reviews
$57.99
Low stock: Only 3 left
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2008 - 2008 International Harvester ProStar, 2007 - 2007 Peterbilt 385, 2006 - 2009 Peterbilt 320, 2006 - 2006 Peterbilt 385, 2005 - 2011 Oshkosh Motor Truck Co. S, 2005 - 2005 Peterbilt 320, 2004 - 2005 International Harvester 9400i SBA, 2004 - 2004 Kenworth T600A, 2004 - 2004 Oshkosh Motor Truck Co. S, 2003 - 2004 International Harvester 7600, 2003 - 2004 International Harvester 8600 SBA, 2003 - 2004 International Harvester 9200i SBA, 2003 - 2003 Freightliner Condor, 2003 - 2003 Freightliner FLD120SD, 2003 - 2003 Freightliner FLD132, 2002 - 2004 International Harvester 5500i, 2002 - 2004 International Harvester 5600i, 2002 - 2004 Peterbilt 385, 2002 - 2003 Freightliner Classic XL, 2002 - 2003 Freightliner FLD112
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Western Star 4900
Item LocatedUnited States
Quantity1
MaterialSteel
ConditionNew
item #1000NNUQ
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Belt Tensioner with Pulley for Freightliner Cascadia 2012-2019 Volvo Peterbilt
A-Premium®Part # APBT0336
Belt Tensioner with Pulley for Freightliner Cascadia 2012-2019 Volvo Peterbilt
4.5176 Reviews
$73.99
Low stock: Only 2 left
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2020 - 2020 Peterbilt 520, 2019 - 2019 Autocar LLC Xpeditor, 2019 - 2019 Peterbilt 520, 2018 - 2018 Autocar LLC Xpeditor, 2017 - 2017 Peterbilt 320, 2016 - 2020 Peterbilt 567, 2016 - 2019 Kenworth T880, 2016 - 2017 Freightliner 114SD, 2016 - 2016 Autocar LLC Xpeditor, 2016 - 2016 Autocar LLC Xpeditor, 2015 - 2017 Peterbilt 367, 2015 - 2015 Kenworth T800, 2015 - 2015 Peterbilt 320, 2015 - 2015 Peterbilt 567, 2014 - 2019 Kenworth T680, 2014 - 2019 Kenworth T800, 2014 - 2019 Kenworth W900, 2014 - 2018 Peterbilt 365, 2014 - 2017 Autocar LLC Xpeditor, 2014 - 2017 Mack CXU
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Western Star 4900
Item LocatedUnited States
Quantity1
ConditionNew
item #1000EZ9Z
Note
This item comes with the Pulley.
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Drive Belt Tensioner Assembly for Kenworth T800 W900 Peterbilt 320 357 378
AisinPart # BTAZ-00263
Drive Belt Tensioner Assembly for Kenworth T800 W900 Peterbilt 320 357 378
4.5176 Reviews
$156.99
Low stock: Only 4 left
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2008 - 2008 International Harvester ProStar, 2006 - 2007 Peterbilt 385, 2005 - 2009 Peterbilt 320, 2004 - 2011 Oshkosh Motor Truck Co. S, 2004 - 2005 International Harvester 9400i SBA, 2004 - 2004 Kenworth T600A, 2003 - 2004 International Harvester 7600, 2003 - 2004 International Harvester 8600 SBA, 2003 - 2004 International Harvester 9200i SBA, 2003 - 2003 Freightliner Condor, 2003 - 2003 Freightliner FLD120SD, 2003 - 2003 Freightliner FLD132, 2002 - 2004 International Harvester 5500i, 2002 - 2004 International Harvester 5600i, 2002 - 2004 Peterbilt 385, 2001 - 2004 International Harvester 5900i, 2001 - 2004 Peterbilt 357, 2001 - 2003 Freightliner Classic XL, 2001 - 2003 Freightliner Columbia, 2001 - 2002 Freightliner Classic
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Western Star 4900
Item LocatedUnited States
Part interchange
366510257799
ConditionNew
item #1018ZVGN
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AISIN Drive Belt Tensioner Assembly for Mack CXU Volvo VNL Kenworth C500 T660
AisinPart # BTAZ-00265
AISIN Drive Belt Tensioner Assembly for Mack CXU Volvo VNL Kenworth C500 T660
4.5176 Reviews
$96.99
Low stock: Only 4 left
Enter ZIP codeFree standard shipping
3-year warranty
90 days free return
Fits 2019 - 2020 Peterbilt 520, 2017 - 2019 Kenworth T800, 2017 - 2018 Kenworth T680, 2017 - 2017 Freightliner 114SD, 2016 - 2019 Kenworth T880, 2016 - 2017 Peterbilt 579, 2016 - 2016 Autocar LLC. Xpeditor, 2016 - 2016 Freightliner 114SD, 2015 - 2017 Peterbilt 367, 2015 - 2015 Kenworth T800, 2014 - 2020 Peterbilt 567, 2014 - 2019 Autocar LLC. Xpeditor, 2014 - 2019 Kenworth T680, 2014 - 2019 Kenworth T800, 2014 - 2019 Kenworth W900, 2014 - 2018 Peterbilt 365, 2014 - 2017 Mack CXU, 2014 - 2017 Peterbilt 320, 2014 - 2017 Peterbilt 579, 2014 - 2017 Volvo VNL
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Western Star 4900
Item LocatedUnited States
Part interchange
38569, 2002279, 3477963
ConditionNew
item #1018P8U9
Show less

What does a belt tensioner do?

Seat belt tensioners represent an integral facet of contemporary automotive safety systems. These sophisticated devices are meticulously engineered to augment passenger protection by mitigating the potentially injurious effects of a vehicular collision or abrupt deceleration event. 

Belt tensioner noise

Belt tensioner noise is typically an indication of a problem within the engine's accessory drive system, and it should not be ignored.

Squealing or Whining Noise: A common sign of a failing or worn-out belt tensioner is a high-pitched squealing or whining noise. This noise is often most noticeable when you start the engine or when you engage accessories like the air conditioner or power steering.

Rattling or Grinding Noise: A failing tensioner may also produce a rattling or grinding noise, especially at higher engine speeds or when the drive belt is under load.

Intermittent Noise: The noise produced by a failing belt tensioner can be intermittent, depending on factors like engine temperature and load.

Belt tensioner replacement

Replacing a belt tensioner is a relatively straightforward mechanical procedure, but it does require some mechanical knowledge and the right tools. Steps to follow when you are planning to replace your seal belt tensioner.

  1. Safety first: Ensure the engine is off, and the vehicle is secure. Disconnect the battery if necessary.
  2. Locate tensioner: Find the belt tensioner, usually a pulley on a bracket with a spring-loaded arm.
  3. Release belt tension: Use the right tool to rotate the tensioner arm, relieving tension on the drive belt.
  4. Remove belt: Carefully slide the belt off the pulleys. Note routing for reference.
  5. Remove old tensioner: Unbolt the old tensioner, keeping track of the hardware.
  6. Install new tensioner: Place the new tensioner in the same spot and secure it with bolts. Align it correctly.
  7. Reinstall belt: Put the belt back on the pulleys, ensuring proper alignment.
  8. Adjust tension: Use the tool to apply tension and follow the manufacturer's specs.
  9. Double-check: Confirm belt alignment and tension on all pulleys.
  10. Test: Start the engine, listen for issues, and check belt movement.
  11. Reconnect battery: If disconnected earlier, reconnect the vehicle's battery.
  12. Dispose of old parts: Properly dispose of the old tensioner and parts.

Related Blogs

Should You Replace the Tensioner When Replacing a Cracked Serpentine Belt?

Don't automatically replace the tensioner with a cracked serpentine belt. Check for weak spring force, misalignment, or noise. Replace both if the tensioner is worn; otherwise, swapping just the belt is often sufficient.

Aug 28, 2026