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Dayco 89124 Accessory Drive Belt Idler Assembly - Alternator and Air Conditioning (Upper) or Upper
| Brand | Dayco 89124 |
|---|---|
| Position | Upper and Alternator and Air Conditioning (Upper) |
| Fits | Freightliner, Kimble Chassis, Motor Coach Industries, Pierce Mfg. Inc., Sterling Truck, Van Hool, and Western Star · 215 vehicles |
OE-style replacement. Accessory drive belt idler assembly for heavy-duty belt routing service.
Wide catalog coverage. Listed across Freightliner, Western Star, Van Hool, and more.
Direct part lookup. Dayco 89124 simplifies ordering and catalog verification.
$51.62Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.
Select your vehicle to confirm fitment
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Step 2 — Quantity
$51.62
Free shipping
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Accessory Drive Belt Idler Assembly options
Accessory Drive Belt Idler Assembly
Dayco part number 89124 is an accessory drive belt idler assembly for heavy-duty commercial applications. It is listed across Freightliner, Western Star, Motor Coach Industries, Van Hool, Pierce Mfg. Inc., Kimble Chassis, and Sterling Truck fitments, with upper-position coverage on many applications.
Key Features
- Accessory drive belt idler assembly for belt routing and tension management.
- Fits a wide range of heavy-duty trucks, coaches, and specialty chassis.
- Upper-position applications are listed across multiple makes and model lines.
- Dayco part number 89124 for direct catalog identification.
Fitment Coverage
Compatible with 2008-2024 Freightliner Cascadia, upper; 2012-2024 Freightliner 114SD, upper; 2013-2022 Freightliner 122SD, upper; 2009-2021 Freightliner M2 112, upper; 2013-2021 Freightliner Sport Chassis, upper; 2013-2021 Western Star 4700SB, upper; 2013-2021 Western Star 4700SF, upper; 2012-2021 Western Star 4800SB, upper; 2013-2021 Western Star 4800SF, upper; 2010-2021 Western Star 4900EX, upper; 2010-2021 Western Star 4900FA, upper; 2009-2021 Western Star 4900SA, upper; 2016-2021 Western Star 5700XE, upper; 2019-2020 Motor Coach Industries J4500, upper; 2014-2020 Van Hool Commuter Coach CX, upper; 2014-2019 Van Hool Tourist Coach TX, upper; 2010-2016 Freightliner Coronado, upper; and additional listed applications including Pierce Mfg. Inc., Kimble Chassis, Sterling Truck, and Van Hool models. Dayco 89124 also appears on select N/A and alternator and air conditioning upper applications where specified in the catalog data.
What It Helps Address
- Worn or noisy belt idler operation.
- Improper belt tracking in accessory drive systems.
- Belt vibration in heavy-duty engine accessory drives.
- Service replacement for catalog-listed idler assembly applications.
Installation Notes and Tips
Verify the exact year, make, model, and position before ordering. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application. Match the catalog position notes carefully, especially where the listing shows upper, N/A, or alternator and air conditioning upper applications. Confirm belt routing and pulley alignment during installation.
Quality Assurance
Dayco is a recognized supplier in belt drive system components, and part number 89124 is cataloged for heavy-duty accessory drive service applications. Use the vehicle listing to confirm the correct fit for your specific configuration.
This part fits 215 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2024 | Freightliner | 114SD | 12.8L | L6 | Upper | — |
| 2024 | Freightliner | Cascadia | 12.8L | L6 | Upper | — |
| 2023 | Freightliner | 114SD | 12.8L | L6 | Upper | — |
| 2023 | Freightliner | Cascadia | 12.8L | L6 | Upper | — |
| 2022 | Freightliner | 114SD | 12.8L | L6 | Upper | — |
| 2022 | Freightliner | 122SD | 15.6L | -6 | Upper | — |
| 2022 | Freightliner | Cascadia | 14.8L | L6 | Upper | — |
| 2021 | Freightliner | 114SD | 12.8L | L6 | Upper | — |
| 2021 | Freightliner | 122SD | 15.6L | -6 | Upper | — |
| 2021 | Freightliner | Cascadia | 15.6L | -6 | Upper | — |
| 2021 | Freightliner | M2 112 | 12.8L | L6 | Upper | — |
| 2021 | Freightliner | Sport Chassis | — | — | Upper | — |
| 2021 | Western Star | 4700SB | 12.8L | L6 | Upper | — |
| 2021 | Western Star | 4700SF | 12.8L | L6 | Upper | — |
| 2021 | Western Star | 4800SB | — | — | Upper | — |
| 2021 | Western Star | 4800SF | — | — | Upper | — |
| 2021 | Western Star | 4900EX | 15.6L | -6 | Upper | — |
| 2021 | Western Star | 4900FA | 12.8L | L6 | Upper | — |
| 2021 | Western Star | 4900SA | 15.6L | -6 | Upper | — |
| 2021 | Western Star | 5700XE | 15.6L | -6 | Upper | — |
| 2020 | Freightliner | 114SD | 12.8L | L6 | Upper | — |
| 2020 | Freightliner | 122SD | 15.6L | -6 | Upper | — |
| 2020 | Freightliner | Cascadia | 15.6L | -6 | Upper | — |
| 2020 | Freightliner | M2 112 | 12.8L | L6 | Upper | — |
| 2020 | Freightliner | Sport Chassis | — | — | Upper | — |
| 2020 | Motor Coach Industries | J4500 | 12.8L | L6 | Upper | — |
| 2020 | Van Hool | Commuter Coach CX | 12.8L | L6 | Upper | — |
| 2020 | Western Star | 4700SB | 12.8L | L6 | Upper | — |
| 2020 | Western Star | 4700SF | 12.8L | L6 | Upper | — |
| 2020 | Western Star | 4800SB | 12.8L | L6 | Upper | — |
| 2020 | Western Star | 4800SF | — | — | Upper | — |
| 2020 | Western Star | 4900EX | 15.6L | -6 | Upper | — |
| 2020 | Western Star | 4900FA | 12.8L | L6 | Upper | — |
| 2020 | Western Star | 4900SA | 15.6L | -6 | Upper | — |
| 2020 | Western Star | 5700XE | 15.6L | -6 | Upper | — |
| 2019 | Freightliner | 114SD | 12.8L | L6 | Upper | — |
| 2019 | Freightliner | 122SD | 15.6L | -6 | Upper | — |
| 2019 | Freightliner | Cascadia | 15.6L | -6 | Upper | — |
| 2019 | Freightliner | M2 112 | 12.8L | L6 | Upper | — |
| 2019 | Freightliner | Sport Chassis | — | — | Upper | — |
| 2019 | Motor Coach Industries | J4500 | 12.8L | L6 | Upper | — |
| 2019 | Van Hool | Commuter Coach CX | 12.8L | L6 | Upper | — |
| 2019 | Van Hool | Tourist Coach TX | 12.8L | L6 | Upper | — |
| 2019 | Western Star | 4700SB | 12.8L | L6 | Upper | — |
| 2019 | Western Star | 4700SF | 12.8L | L6 | Upper | — |
| 2019 | Western Star | 4800SB | 12.8L | L6 | Upper | — |
| 2019 | Western Star | 4800SF | — | — | Upper | — |
| 2019 | Western Star | 4900EX | 15.6L | -6 | Upper | — |
| 2019 | Western Star | 4900FA | 12.8L | L6 | Upper | — |
| 2019 | Western Star | 4900SA | 15.6L | -6 | Upper | — |
| 2019 | Western Star | 5700XE | 15.6L | -6 | Upper | — |
| 2018 | Freightliner | 114SD | 12.8L | L6 | Upper | — |
| 2018 | Freightliner | 122SD | 15.6L | -6 | Upper | — |
| 2018 | Freightliner | Cascadia | 15.6L | -6 | Upper | — |
| 2018 | Freightliner | M2 112 | 12.8L | L6 | Upper | — |
| 2018 | Freightliner | Sport Chassis | — | — | Upper | — |
| 2018 | Van Hool | Commuter Coach CX | 12.8L | L6 | Upper | — |
| 2018 | Van Hool | Tourist Coach TX | 12.8L | L6 | Upper | — |
| 2018 | Western Star | 4700SB | 12.8L | L6 | Upper | — |
| 2018 | Western Star | 4700SF | 12.8L | L6 | Upper | — |
| 2018 | Western Star | 4800SB | 12.8L | L6 | Upper | — |
| 2018 | Western Star | 4800SF | — | — | Upper | — |
| 2018 | Western Star | 4900EX | 15.6L | -6 | Upper | — |
| 2018 | Western Star | 4900FA | 15.6L | -6 | Upper | — |
| 2018 | Western Star | 4900SA | 15.6L | -6 | Upper | — |
| 2018 | Western Star | 5700XE | 15.6L | -6 | Upper | — |
| 2017 | Freightliner | 114SD | 12.8L | L6 | Upper | — |
| 2017 | Freightliner | 122SD | 15.6L | -6 | Upper | — |
| 2017 | Freightliner | Cascadia | 14.8L | L6 | Upper | — |
| 2017 | Freightliner | M2 112 | 12.8L | L6 | Upper | — |
| 2017 | Freightliner | Sport Chassis | — | — | Upper | — |
| 2017 | Van Hool | Commuter Coach CX | 12.8L | L6 | Upper | — |
| 2017 | Van Hool | Tourist Coach TX | 12.8L | L6 | Upper | — |
| 2017 | Western Star | 4700SB | 12.8L | L6 | Upper | — |
| 2017 | Western Star | 4700SF | 12.8L | L6 | Upper | — |
| 2017 | Western Star | 4800SB | 12.8L | L6 | Upper | — |
| 2017 | Western Star | 4800SF | — | — | Upper | — |
| 2017 | Western Star | 4900EX | 15.6L | -6 | Upper | — |
| 2017 | Western Star | 4900FA | 15.6L | -6 | Upper | — |
| 2017 | Western Star | 4900SA | 15.6L | -6 | Upper | — |
| 2017 | Western Star | 5700XE | 15.6L | -6 | Upper | — |
| 2016 | Freightliner | 114SD | 12.8L | L6 | Upper | — |
| 2016 | Freightliner | 122SD | 15.6L | -6 | Upper | — |
| 2016 | Freightliner | Cascadia | 14.8L | L6 | Upper | — |
| 2016 | Freightliner | Coronado | 15.6L | -6 | Upper | — |
| 2016 | Freightliner | M2 112 | 12.8L | L6 | Upper | — |
| 2016 | Freightliner | Sport Chassis | — | — | Upper | — |
| 2016 | Kimble Chassis | KF3200C | — | — | Upper | — |
| 2016 | Van Hool | Commuter Coach CX | 12.8L | L6 | Upper | — |
| 2016 | Van Hool | Tourist Coach TX | 12.8L | L6 | Upper | — |
| 2016 | Western Star | 4700SB | 12.8L | L6 | Upper | — |
| 2016 | Western Star | 4700SF | 12.8L | L6 | Upper | — |
| 2016 | Western Star | 4800SB | 12.8L | L6 | Upper | — |
| 2016 | Western Star | 4800SF | — | — | Upper | — |
| 2016 | Western Star | 4900EX | 15.6L | -6 | Upper | — |
| 2016 | Western Star | 4900FA | 15.6L | -6 | Upper | — |
| 2016 | Western Star | 4900SA | 15.6L | -6 | Upper | — |
| 2016 | Western Star | 5700XE | 15.6L | -6 | Upper | — |
| 2015 | Freightliner | 114SD | 12.8L | L6 | Upper | — |
| 2015 | Freightliner | 122SD | 15.6L | -6 | Upper | — |
| 2015 | Freightliner | Cascadia | 14.8L | L6 | Upper | — |
| 2015 | Freightliner | Coronado | 15.6L | -6 | Upper | — |
| 2015 | Freightliner | M2 112 | 12.8L | L6 | Upper | — |
| 2015 | Freightliner | Sport Chassis | — | — | Upper | — |
| 2015 | Freightliner | XC Modular Rail | 12.8L | L6 | Upper | — |
| 2015 | Freightliner | XC Raised Rail | 12.8L | L6 | Upper | — |
| 2015 | Kimble Chassis | KF3200C | — | — | Upper | — |
| 2015 | Motor Coach Industries | J4500 | 12.8L | L6 | Upper | — |
| 2015 | Van Hool | Commuter Coach CX | 12.8L | L6 | Upper | — |
| 2015 | Van Hool | TDX Double Decker Coach | — | — | Upper | — |
| 2015 | Van Hool | Tourist Coach TX | 12.8L | L6 | Upper | — |
| 2015 | Western Star | 4700SB | 12.8L | L6 | Upper | — |
| 2015 | Western Star | 4700SF | 12.8L | L6 | Upper | — |
| 2015 | Western Star | 4800SB | 12.8L | L6 | Upper | — |
| 2015 | Western Star | 4800SF | — | — | Upper | — |
| 2015 | Western Star | 4900EX | 15.6L | -6 | Upper | — |
| 2015 | Western Star | 4900FA | 15.6L | -6 | Upper | — |
| 2015 | Western Star | 4900SA | 15.6L | -6 | Upper | — |
| 2014 | Freightliner | 114SD | 12.8L | L6 | Upper | — |
| 2014 | Freightliner | 122SD | 15.6L | -6 | Upper | — |
| 2014 | Freightliner | Cascadia | 15.6L | -6 | Upper | — |
| 2014 | Freightliner | Coronado | 15.6L | -6 | Upper | — |
| 2014 | Freightliner | M2 112 | 12.8L | L6 | Upper | — |
| 2014 | Freightliner | Sport Chassis | — | — | Upper | — |
| 2014 | Freightliner | XC Modular Rail | 12.8L | L6 | Upper | — |
| 2014 | Freightliner | XC Raised Rail | 12.8L | L6 | Upper | — |
| 2014 | Motor Coach Industries | J4500 | 12.8L | L6 | Upper | — |
| 2014 | Pierce Mfg. Inc. | Arrow XT | 12.8L | L6 | Upper | — |
| 2014 | Pierce Mfg. Inc. | Dash CF | 12.8L | L6 | Upper | — |
| 2014 | Pierce Mfg. Inc. | Quantum | 12.8L | L6 | Upper | — |
| 2014 | Pierce Mfg. Inc. | Velocity | 12.8L | L6 | Upper | — |
| 2014 | Van Hool | Commuter Coach CX | 12.8L | L6 | Upper | — |
| 2014 | Van Hool | T2100 | 12.8L | L6 | Upper | — |
| 2014 | Van Hool | Tourist Coach TX | 12.8L | L6 | Upper | — |
| 2014 | Western Star | 4700SB | 12.8L | L6 | Upper | — |
| 2014 | Western Star | 4700SF | 12.8L | L6 | Upper | — |
| 2014 | Western Star | 4800SB | 12.8L | L6 | Upper | — |
| 2014 | Western Star | 4800SF | — | — | Upper | — |
| 2014 | Western Star | 4900EX | 15.6L | -6 | Upper | — |
| 2014 | Western Star | 4900FA | 15.6L | -6 | Upper | — |
| 2014 | Western Star | 4900SA | 15.6L | -6 | Upper | — |
| 2013 | Freightliner | 114SD | 12.8L | L6 | Upper | — |
| 2013 | Freightliner | 122SD | 15.6L | -6 | Upper | — |
| 2013 | Freightliner | Cascadia | 12.8L | L6 | Upper | — |
| 2013 | Freightliner | Coronado | 15.6L | -6 | Upper | — |
| 2013 | Freightliner | M2 112 | 12.8L | L6 | Upper | — |
| 2013 | Freightliner | Sport Chassis | — | — | Upper | — |
| 2013 | Pierce Mfg. Inc. | Arrow XT | 12.8L | L6 | Upper | — |
| 2013 | Pierce Mfg. Inc. | Dash CF | 12.8L | L6 | Upper | — |
| 2013 | Pierce Mfg. Inc. | Quantum | 12.8L | L6 | Upper | — |
| 2013 | Pierce Mfg. Inc. | Velocity | 12.8L | L6 | Upper | — |
| 2013 | Van Hool | T2100 | 12.8L | L6 | Upper | — |
| 2013 | Western Star | 4700SB | 12.8L | L6 | Upper | — |
| 2013 | Western Star | 4700SF | 12.8L | L6 | Upper | — |
| 2013 | Western Star | 4800SB | 12.8L | L6 | Upper | — |
| 2013 | Western Star | 4800SF | — | — | Upper | — |
| 2013 | Western Star | 4900EX | 15.6L | -6 | Upper | — |
| 2013 | Western Star | 4900FA | 15.6L | -6 | Upper | — |
| 2013 | Western Star | 4900SA | 15.6L | -6 | Upper | — |
| 2012 | Freightliner | 114SD | 12.8L | L6 | Upper | — |
| 2012 | Freightliner | Cascadia | 15.6L | -6 | Upper | — |
| 2012 | Freightliner | Coronado | 15.6L | -6 | Upper | — |
| 2012 | Freightliner | M2 112 | 12.8L | L6 | Upper | — |
| 2012 | Pierce Mfg. Inc. | Custom | 12.8L | L6 | Upper | — |
| 2012 | Van Hool | T2100 | 12.8L | L6 | Upper | — |
| 2012 | Western Star | 4800SB | — | — | Upper | — |
| 2012 | Western Star | 4900EX | 15.6L | -6 | Upper | — |
| 2012 | Western Star | 4900FA | 15.6L | -6 | Upper | — |
| 2012 | Western Star | 4900SA | 15.6L | -6 | Upper | — |
| 2012 | Western Star | 6900XD | 15.6L | -6 | N/A | — |
| 2011 | Freightliner | Cascadia | 15.6L | -6 | Upper | — |
| 2011 | Freightliner | Century Class | 12.8L | L6 | Upper | — |
| 2011 | Freightliner | Classic | 12.8L | L6 | Upper | — |
| 2011 | Freightliner | Columbia | 14.8L | L6 | Upper | — |
| 2011 | Freightliner | Coronado | 15.6L | -6 | Upper | — |
| 2011 | Freightliner | FLD120SD | 12.8L | L6 | Upper | — |
| 2011 | Freightliner | M2 112 | 12.8L | L6 | Upper | — |
| 2011 | Freightliner | Sport Chassis | 12.8L | L6 | Upper | — |
| 2011 | Pierce Mfg. Inc. | Arrow XT | 12.8L | L6 | Upper | — |
| 2011 | Pierce Mfg. Inc. | Quantum | 12.8L | L6 | Upper | — |
| 2011 | Pierce Mfg. Inc. | Velocity | 12.8L | L6 | Upper | — |
| 2011 | Van Hool | T2100 | 12.8L | L6 | Upper | — |
| 2011 | Western Star | 4900EX | 15.6L | -6 | Upper | — |
| 2011 | Western Star | 4900FA | 15.6L | -6 | Upper | — |
| 2011 | Western Star | 4900SA | 15.6L | -6 | Upper | — |
| 2011 | Western Star | 6900XD | 15.6L | -6 | N/A | — |
| 2010 | Freightliner | Cascadia | 14.8L | L6 | Upper | — |
| 2010 | Freightliner | Century Class | 14.8L | L6 | N/A | — |
| 2010 | Freightliner | Classic | 12.8L | L6 | Upper | — |
| 2010 | Freightliner | Columbia | 14.8L | L6 | Upper | — |
| 2010 | Freightliner | Coronado | 14.0L | L6 | Upper | — |
| 2010 | Freightliner | FLD120SD | 12.8L | L6 | Upper | — |
| 2010 | Freightliner | M2 112 | 12.8L | L6 | Upper | — |
| 2010 | Freightliner | Sport Chassis | 12.8L | L6 | Upper | — |
| 2010 | Sterling Truck | A9500 | 12.8L | L6 | Upper | — |
| 2010 | Sterling Truck | L9500 | 12.8L | L6 | Upper | — |
| 2010 | Western Star | 4900EX | 14.8L | L6 | Upper | — |
| 2010 | Western Star | 4900FA | 15.6L | -6 | Upper | — |
| 2010 | Western Star | 4900SA | 14.8L | L6 | Upper | — |
| 2009 | Freightliner | Cascadia | 14.8L | L6 | Upper | — |
| 2009 | Freightliner | Century Class | 14.8L | L6 | N/A | — |
| 2009 | Freightliner | Classic | 12.8L | L6 | Upper | — |
| 2009 | Freightliner | Columbia | 14.8L | L6 | Upper | — |
| 2009 | Freightliner | FLD120SD | 12.8L | L6 | Upper | — |
| 2009 | Freightliner | M2 112 | 12.8L | L6 | Upper | — |
| 2009 | Freightliner | Sport Chassis | — | — | Upper | — |
| 2009 | Sterling Truck | A9500 | 14.8L | L6 | N/A | — |
| 2009 | Sterling Truck | Car Hauler | 12.8L | L6 | Upper | — |
| 2009 | Sterling Truck | L9500 | 12.8L | L6 | Upper | — |
| 2009 | Western Star | 4900FA | 14.8L | L6 | Alternator and Air Conditioning (Upper) | — |
| 2009 | Western Star | 4900SA | 14.8L | L6 | Upper | — |
| 2008 | Freightliner | Cascadia | 14.8L | L6 | Upper | — |
| 2008 | Freightliner | Century Class | 14.8L | L6 | N/A | — |
| 2008 | Freightliner | Columbia | 14.8L | L6 | Upper | — |
| 2008 | Sterling Truck | A9500 | 14.8L | L6 | N/A | — |
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