Dayco 5080940 Serpentine Belt

Dayco 5080940 Serpentine Belt Overview

The Dayco 5080940 serpentine belt is a K-section accessory drive belt built for consistent power transfer in the engine accessory drive system. It uses EPDM construction with aramid reinforcement for durability, stable tensioning, and dependable operation across a wide temperature range.

With 8 ribs, a straight rib profile, and a black finish, this belt is specified for applications that call for a 94.00-inch effective length and 94.63-inch outside circumference. It is a direct-fit style serpentine belt for select heavy-duty and industrial vehicle applications, including Cummins, Freightliner, and Navistar use cases.

Key Features

• Part number: 5080940
• EPDM belt material with aramid reinforcement
• 8-rib K-section serpentine belt
• Top width: 1.10 in.
• Effective length: 94.00 in. (2387.60 mm)
• Outside circumference: 94.63 in. (2403.61 mm)
• Straight rib profile with standard rib depth
• Operating temperature range: -45°F to 212°F
• Built to SAE J1459 and SAE J2432 standards

Detailed Description

Dayco 5080940 is an accessory drive serpentine belt engineered for engines that rely on an 8-rib K-section belt layout. The EPDM compound helps maintain belt integrity under heat and cold cycling, while aramid reinforcement adds tensile strength for demanding accessory drive loads. This makes it a practical replacement choice for vehicles and equipment that require stable belt tracking and consistent accessory operation. For buyers searching for a Dayco 5080940 serpentine belt, this part number is also referenced in applications tied to Cummins, Freightliner, and Navistar platforms, as well as John Deere equipment listings.

This part cross-references Gates K080939 for the same application.

What It Helps Address

• Squealing or chirping from a worn accessory drive belt
• Cracking, glazing, or rib wear on the existing serpentine belt
• Loss of accessory drive performance from belt stretch or slip
• Uneven belt tracking caused by an aging belt profile
• Replacement needs for select Cummins, Freightliner, and Navistar applications

Installation Notes and Tips

Verify the belt routing, rib count, and required effective length before installation. Confirm that the pulley system calls for an 8-rib K-section belt with a 94.00-inch effective length and 1.10-inch top width. Inspect tensioners, idlers, and pulley surfaces at the same time; worn components can shorten belt life and affect tracking. For fitment-based searches, this Dayco 5080940 belt is commonly associated with heavy-duty engine accessory drive applications rather than passenger-car use.

Quality Assurance

This belt is manufactured to SAE J1459 and SAE J2432 standards, with EPDM construction and aramid reinforcement selected for durability across a broad operating range. The Dayco 5080940 is built for consistent performance in demanding accessory drive systems.