Gates K120891HD serpentine belt for the 2005-2007 Peterbilt 379 truck 6-cylinder 14.9L, the 2006 379 truck 6-cylinder 10.8L and other vehicles drives the fan and alternator from engine power. The Gates FleetRunner Micro-V serpentine belt is engineered for heavy-duty drives and fleet service.
- FleetRunner Heavy-Duty Micro-V line, engineered to reduce downtime
- Patented EPDM construction with a distinct green overcord
- Patented material that holds peak performance at prolonged extreme operating temperatures
- Heavy-duty construction that resists cracking and wear, even at extreme temperatures
- Special compound for flexibility, stability, load carrying capacity and belt life
Quick facts
- Part: Gates K120891HD serpentine belt
- Fits: 2005-2007 Peterbilt 379 truck 6-cylinder 14.9L, the 2006 379 truck 6-cylinder 10.8L and other vehicles
- Position: Fan and alternator, fan
- Material: EPDM
- Condition: New
Cracked or glazed ribs, a squeal from the belt drive, or a fan or alternator that seems to slip can mean the belt is worn. Before you replace it, look along the ribs with the engine off and cool, and look the pulleys and tensioner over for damage or wobble, so you know the belt is the real cause.
Fits
This belt fits the 2005-2007 Peterbilt 379 truck 6-cylinder 14.9L, the 2006 379 truck 6-cylinder 10.8L and the 2004-2007 Peterbilt 378 truck 6-cylinder 14.9L.
Specifications
Fit and size
- Position: fan and alternator, fan
- Quantity per vehicle: 1
- Cross section: K
- Rib quantity: 12
- Top width: 42 mm (1.647 in)
- Outside circumference: 2278 mm (89.625 in)
- Effective length: 2264 mm (89.12 in)
Build and materials
- Type: automotive V-ribbed belt (heavy duty)
- Material: EPDM
- Cord material: polyester
- Grade type: OE Improved
- Condition: new
- Country of origin: Mexico
In the box
One serpentine belt. The fitment calls for one belt per truck.
Installation notes
- Tensioner replacement is recommended if the truck is equipped with one.
Interchange: 25-120891 · 25-120891HD
12K891 · K120891 · 4120890 · D11085234 · D8410003122260 · 1120891 · 12PK2261 · 12PK2262 · 12PK2263 · 12PK2264 · 12PK2265 · 12PK2266 · 12PK2267
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
12K891, K120891HD, K120891, 4120890, D11085234, D8410003122260, 1120891, 12PK2261, 12PK2262, 12PK2263, 12PK2264, 12PK2265, 12PK2266, 12PK2267, 25-120891, 25-120891HD
Frequently Asked Questions
Is this Gates FleetRunner serpentine belt right for the 2005-2007 Peterbilt 379 truck 6-cylinder 14.9L?
Yes. Gates K120891HD fits the 2005-2007 Peterbilt 379 truck 6-cylinder 14.9L and the 2006 379 truck 6-cylinder 10.8L, and it also fits the 2004-2007 Peterbilt 378 truck 6-cylinder 14.9L.
How many ribs do Gates ribbed belts like this K120891HD have?
This Gates K120891HD has 12 ribs on a K cross section, with a 42 mm top width and a 2264 mm effective length.
Is this Gates Micro-V serpentine belt made of EPDM?
Yes. The belt material is EPDM with a polyester cord, and the patented construction has a distinct green overcord.
Do Gates drive belts like this one need a new tensioner too?
Yes, if the truck has one: tensioner replacement is recommended with this belt. This listing is one belt only; the tensioner is not included.
Is this belt heavy-duty, and what grade is it?
Yes. Gates K120891HD is a heavy-duty Micro-V belt in the OE Improved grade, and its construction resists cracking and wear at extreme temperatures.
