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Dayco 5120788 Serpentine Belt - Fan or Fan and Water Pump
| Brand | Dayco 5120788 |
|---|---|
| Position | Fan and Fan and Water Pump |
| Material | Epdm, aramid reinforced |
| Top Width | 1.66 |
| Color | Black |
| Effective Length | 2000.00 |
| Effective Length | 78.74 |
| Outside Circumference | 2014.22 |
| Outside Circumference | 79.30 |
| Rib Quantity | 12 |
| Cross Section | K-section |
| Maximum Operating Temperature | 100 |
| Maximum Operating Temperature | 212 |
| Minimum Operating Temperature | -42.7 |
| Minimum Operating Temperature | -45 |
| Rib Depth | Standard |
| Rib Profile | Straight rib |
| Standards | Sae j1459, sae j2432 |
| Fits | Mack and Volvo · 38 vehicles |
EPDM reinforced construction. Aramid reinforcement adds strength for demanding accessory drive service.
12-rib K-section design. Matches the specified heavy-duty belt geometry for listed applications.
SAE-standard build. Manufactured to SAE J1459 and SAE J2432 requirements.
Cross-references ACDelco K120786HD, CARQUEST K120786HD and Gates K120786HD for the same application. See all 10.
Overview
Dayco 5120788 is a serpentine belt built for heavy-duty accessory drive applications. It uses EPDM rubber with aramid reinforcement for strength, stable tension retention, and resistance to heat and wear in demanding cooling-system drives.
Compatible with Volvo VHD and VAH, as well as Mack CHU, CXU, GU7, and GU8 applications, this belt is specified for fan and fan-and-water-pump drives. The 12-rib K-section profile and 78.74-inch effective length support the correct accessory drive geometry for the listed applications.
Key Features
- EPDM construction with aramid reinforcement for durability in accessory drive service.
- 12-rib K-section design for the listed heavy-duty belt drives.
- Straight-rib profile for consistent belt tracking.
- Built to SAE J1459 and SAE J2432 standards.
- Black finish with a standard rib depth.
Fitment Details
- Fits 2014-2018 Volvo VHD, Fan.
- Fits 2015-2017 Volvo VAH, Fan.
- Fits 2016 Mack GU8, Fan and Water Pump.
- Fits 2015 Mack CHU, Fan.
- Fits 2008-2009 Mack CHU, Fan.
- Fits 2014-2015 Mack CXU, Fan.
- Fits 2010-2014 Mack CHU, Fan, 78 3/4 In. Belt.
- Fits 2011-2014 Volvo VAH, Fan and Water Pump.
- Fits 2007-2013 Volvo VHD, Fan and Water Pump.
- Fits 2008-2011 Mack GU7, Fan, 12 Rib Belt.
- Fits 2008-2011 Mack GU8, Fan, 12 Rib Belt.
Application Use
- Restores proper drive belt routing for accessory systems.
- Addresses belt noise caused by wear or glazing.
- Helps correct slipping in fan-drive service.
- Supports replacement of cracked, stretched, or heat-aged belts.
- Maintains accessory drive operation in heavy-duty cooling applications.
Installation Notes
Verify belt length, rib count, and cross-section against the existing belt before installation. Confirm the application uses a 12-rib K-section serpentine belt and match the listed fan or fan-and-water-pump configuration. Inspect pulleys and tensioners for wear before installing Dayco 5120788.
Quality Assurance
Dayco manufactures accessory drive components to meet SAE J1459 and SAE J2432 standards. Part number 5120788 is engineered for the specified heavy-duty applications and material requirements.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2018 | Volvo | VHD | 12.8L | -6 | Fan | — |
| 2017 | Volvo | VAH | 12.8L | -6 | Fan | — |
| 2017 | Volvo | VHD | 12.8L | -6 | Fan | — |
| 2016 | Mack | GU8 | — | — | Fan and Water Pump | — |
| 2016 | Volvo | VAH | 12.8L | -6 | Fan | — |
| 2016 | Volvo | VHD | 12.8L | -6 | Fan | — |
| 2015 | Mack | CHU | — | — | Fan | — |
| 2015 | Mack | CXU | — | — | Fan | — |
| 2015 | Volvo | VAH | 12.8L | -6 | Fan | — |
| 2015 | Volvo | VHD | 12.8L | -6 | Fan | — |
| 2014 | Mack | CHU | — | — | Fan | 78 3/4 In. Belt |
| 2014 | Mack | CXU | — | — | Fan | — |
| 2014 | Volvo | VAH | 12.8L | -6 | Fan and Water Pump | — |
| 2014 | Volvo | VHD | 12.8L | -6 | Fan | — |
| 2013 | Mack | CHU | — | — | Fan | 78 3/4 In. Belt |
| 2013 | Volvo | VAH | 12.8L | -6 | Fan and Water Pump | — |
| 2013 | Volvo | VHD | 12.8L | -6 | Fan and Water Pump | — |
| 2012 | Mack | CHU | — | — | Fan | 78 3/4 In. Belt |
| 2012 | Volvo | VAH | 12.8L | -6 | Fan and Water Pump | — |
| 2012 | Volvo | VHD | 12.8L | -6 | Fan and Water Pump | — |
| 2011 | Mack | CHU | — | — | Fan | 78 3/4 In. Belt |
| 2011 | Mack | GU7 | — | — | Fan | 12 Rib Belt |
| 2011 | Mack | GU8 | — | — | Fan | 12 Rib Belt |
| 2011 | Volvo | VAH | 12.8L | -6 | Fan and Water Pump | — |
| 2011 | Volvo | VHD | 12.8L | -6 | Fan and Water Pump | — |
| 2010 | Mack | CHU | — | — | Fan | 78 3/4 In. Belt |
| 2010 | Mack | GU7 | — | — | Fan | 12 Rib Belt |
| 2010 | Mack | GU8 | — | — | Fan | 12 Rib Belt |
| 2010 | Volvo | VHD | — | — | Fan and Water Pump | — |
| 2009 | Mack | CHU | — | — | Fan | — |
| 2009 | Mack | GU7 | — | — | Fan | 12 Rib Belt |
| 2009 | Mack | GU8 | — | — | Fan | 12 Rib Belt |
| 2009 | Volvo | VHD | — | — | Fan and Water Pump | — |
| 2008 | Mack | CHU | — | — | Fan | — |
| 2008 | Mack | GU7 | — | — | Fan | 12 Rib Belt |
| 2008 | Mack | GU8 | — | — | Fan | 12 Rib Belt |
| 2008 | Volvo | VHD | 12.8L | -6 | Fan and Water Pump | — |
| 2007 | Volvo | VHD | 12.8L | -6 | Fan and Water Pump | — |
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