Dayco 5120873 serpentine belt for the 2008-2015 Kenworth T800 6-cylinder 14.9L, the 2015 T800 6-cylinder 10.8L and other vehicles turns the alternator and fan, and on some applications the water pump, from engine power. Its ribbed underside grips the accessory pulleys so they turn with the engine.
- EPDM belt body with aramid reinforcement
- K-section cross section with a straight rib profile and standard rib depth
- Listed to the SAE J1459 and SAE J2432 standards
- Operating temperature range from -45 F to 212 F (-42.7 C to 100 C)
Quick facts
- Part: Dayco 5120873 serpentine belt
- Fits: the 2008-2015 Kenworth T800 6-cylinder 14.9L, the 2015 T800 6-cylinder 10.8L and other vehicles
- Position: Alternator and fan; alternator, fan and water pump
- Material: EPDM, aramid reinforced
- Condition: New
A cracked, frayed or glazed belt, a squeal from the front of the engine or a charging warning light can point to a worn belt. A weak tensioner, a rough idler pulley or a tired alternator bearing can be behind the same signs, so find out which one is at fault before you buy a belt.
Fits
The vehicles this belt fits include the 2008-2015 Kenworth T660 6-cylinder 14.9L and the 2007-2010 Peterbilt 386 6-cylinder 14.9L, along with the trucks named above. Most applications take one belt, and a few take two. If your truck isn't named here, look it up by year and engine in the "Vehicles it fits" section.
Specifications
Fit and size
- Position: Alternator and fan; alternator, fan and water pump
- Quantity per vehicle: 1 on most applications, 2 on some
Build and materials
- Material: EPDM, aramid reinforced
- Rib profile: Straight rib
- Cross section: K-section
- Rib depth: Standard
- Standards: SAE J1459, SAE J2432
- Operating temperature: -45 F to 212 F (-42.7 C to 100 C)
- Condition: New
Interchange: 25-120872 · 25-120872HD
12K872 · 12PK2215 · K120872 · K120872HD · 4120872 · 4120872X
This part cross-references / interchanges with the following part numbers:
12K872, 12PK2215, K120872, K120872HD, 4120872, 4120872X, 25-120872, 25-120872HD, D1108-4222, D84-1000-1122215, D84-1000-6122215
Frequently Asked Questions
Is the Dayco 5120873 belt right for the 2008-2015 Kenworth T660 6-cylinder 14.9L?
Yes. Dayco 5120873 is listed for the 2008-2015 Kenworth T660 6-cylinder 14.9L. For another truck, check its year and engine in the "Vehicles it fits" section.
What is this Dayco drive belt made of?
Dayco 5120873 is made of EPDM with aramid reinforcement. It has a K-section cross section and a straight rib profile with standard rib depth.
Does this Dayco fan belt also run the water pump?
Yes, on some applications. Dayco 5120873 is listed for drives that run the alternator and fan, and for drives that add the water pump.
What temperature range does the Dayco 5120873 belt handle?
Dayco 5120873 operates from -45 F to 212 F (-42.7 C to 100 C). It is listed to the SAE J1459 and SAE J2432 standards.
How can I tell this serpentine belt is worn?
With the engine off and cool, look for cracks, fraying or chunks missing from the ribs. A squeal from the front of the engine can also be a sign.
