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Dayco 89950 Accessory Drive Belt Tensioner Assembly - Alternator and Air Conditioning
| Brand | Dayco 89950 |
|---|---|
| Position | Alternator and Air Conditioning |
| Fits | Kenworth and Peterbilt · 58 vehicles |
OE-style replacement. Direct-fit tensioner assembly for accessory drive belt service.
Heavy-duty application. Built for alternator and air conditioning belt routing.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Accessory Drive Belt Tensioner Assembly
Dayco 89950 is an accessory drive belt tensioner assembly for heavy-duty truck applications with alternator and air conditioning drive routing. It is built for direct replacement use on Kenworth and Peterbilt models, including Kenworth T680, T800, T880, W900, W990, T660, T700 and Peterbilt 579, 389, 384, 587, 367.
Key Features
- Accessory drive belt tensioner assembly for alternator and air conditioning belt systems.
- Direct replacement fitment for select Kenworth and Peterbilt trucks.
- Supports consistent belt tension in accessory drive applications.
- Dayco part number 89950 for catalog and service matching.
Detailed Description
Dayco 89950 is a replacement tensioner assembly for accessory drive belt systems that route power to the alternator and air conditioning components. It is listed for multiple Kenworth and Peterbilt heavy-duty truck platforms, with fitment covering 2014-2021 Kenworth T680, 2014-2021 Kenworth T800, 2019-2021 and 2014-2016 Kenworth T880, 2015-2021 Kenworth W900, 2019-2021 Kenworth W990, 2014-2021 Peterbilt 579, 2014-2018 Kenworth T660, 2014-2017 Peterbilt 389, 2014-2016 Peterbilt 384, 2015-2016 Peterbilt 587, 2014-2015 Kenworth T700, and 2014-2015 Peterbilt 367. Use Dayco 89950 when replacing a worn or noisy tensioner in the accessory drive belt system.
What It Is Used For
- Correcting belt slack in the accessory drive system.
- Addressing belt noise caused by a worn tensioner.
- Restoring stable belt tracking for alternator and air conditioning drive routing.
- Replacing a tensioner with reduced spring force or inconsistent operation.
Installation Notes and Tips
Verify the vehicle year, model, and accessory drive routing before ordering. Match the existing belt path and mounting configuration to the listed fitment for Kenworth and Peterbilt applications. Inspect the belt, pulleys, and related drive components during service so the new tensioner can operate correctly.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2021 | Kenworth | T680 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2021 | Kenworth | T800 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2021 | Kenworth | T880 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2021 | Kenworth | W900 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2021 | Kenworth | W990 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2021 | Peterbilt | 579 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2020 | Kenworth | T680 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2020 | Kenworth | T800 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2020 | Kenworth | T880 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2020 | Kenworth | W900 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2020 | Kenworth | W990 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2020 | Peterbilt | 579 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2019 | Kenworth | T680 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2019 | Kenworth | T800 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2019 | Kenworth | T880 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2019 | Kenworth | W900 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2019 | Kenworth | W990 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2019 | Peterbilt | 579 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2018 | Kenworth | T660 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2018 | Kenworth | T680 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2018 | Kenworth | T800 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2018 | Kenworth | W900 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2018 | Peterbilt | 579 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2017 | Kenworth | T660 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2017 | Kenworth | T680 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2017 | Kenworth | T800 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2017 | Kenworth | W900 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2017 | Peterbilt | 389 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2017 | Peterbilt | 579 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2016 | Kenworth | T660 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2016 | Kenworth | T680 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2016 | Kenworth | T800 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2016 | Kenworth | T880 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2016 | Kenworth | W900 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2016 | Peterbilt | 384 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2016 | Peterbilt | 389 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2016 | Peterbilt | 579 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2016 | Peterbilt | 587 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2015 | Kenworth | T660 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2015 | Kenworth | T680 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2015 | Kenworth | T700 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2015 | Kenworth | T800 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2015 | Kenworth | T880 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2015 | Kenworth | W900 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2015 | Peterbilt | 367 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2015 | Peterbilt | 384 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2015 | Peterbilt | 389 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2015 | Peterbilt | 579 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2015 | Peterbilt | 587 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2014 | Kenworth | T660 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2014 | Kenworth | T680 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2014 | Kenworth | T700 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2014 | Kenworth | T800 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2014 | Kenworth | T880 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2014 | Peterbilt | 367 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2014 | Peterbilt | 384 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2014 | Peterbilt | 389 | 12.9L | -6 | Alternator and Air Conditioning | — |
| 2014 | Peterbilt | 579 | 12.9L | -6 | Alternator and Air Conditioning | — |
| No rows match your filter. | ||||||