Dayco 5120852 Serpentine Belt - Fan or Fan and Alternator

Overview

Dayco 5120852 is a serpentine belt built for accessory drive applications that require a 12-rib K-section design. It uses EPDM with aramid reinforcement for stable operation across a wide temperature range and consistent rib engagement.

Compatible With 2023 Kenworth T680 fan applications and 2014-2017 International ProStar fan and alternator applications, this belt is specified for direct replacement use where the listed dimensions and rib count match the original setup. Part number 5120852 is also referenced by several aftermarket and OE cross numbers for the same application.

Key Features

• EPDM construction with aramid reinforcement for durable belt structure
• 12-rib K-section profile for accessory drive systems
• Straight rib profile for consistent pulley contact
• 85.24 in. effective length and 85.80 in. outside circumference
• Meets SAE J1459 and SAE J2432 standards
• Black finish with standard rib depth

Product Details

Dayco 5120852 is a serpentine belt engineered around a 1.66 in. top width and a 12-rib layout, making it suitable for accessory drive systems that depend on accurate belt tracking and stable load transfer. The EPDM compound helps the belt maintain performance across temperatures from -45 to 212 degrees Fahrenheit, while aramid reinforcement adds strength for demanding service conditions. Use part number 5120852 when matching the original belt specification on the listed Kenworth and International applications.

This part cross-references Gates K120852 and ACDelco 12K852 for the same application.

Common Uses

• Belt noise caused by wear, glazing, or rib damage
• Loss of accessory drive performance from belt stretch
• Cracking or separation in an aging serpentine belt
• Incorrect belt length or rib count on the existing setup
• Reduced pulley contact from a worn rib profile

Installation Notes

Verify the belt routing, rib count, and measured length before installation. Confirm the application by vehicle, engine accessory layout, and position notes, since this part is listed for fan and alternator drive use on specific heavy-duty models. Inspect pulleys and tensioner condition during replacement to help prevent premature belt wear.

Quality Assurance

Dayco 5120852 is built to SAE J1459 and SAE J2432 standards for accessory drive belt applications. The EPDM and aramid-reinforced construction supports consistent service in demanding operating temperatures.