Dayco 89577 Accessory Drive Belt Idler Pulley

Dayco 89577 is an accessory drive belt idler pulley for serpentine belt systems. Built with a polymer pulley body and a single bearing, it supports smooth belt routing in upper and lower accessory drive applications across select Hyundai and Kia vehicles.

Key Features

• Accessory drive belt idler pulley for serpentine belt systems
• Polymer pulley construction
• 6-groove design for 6-rib serpentine belts
• Single bearing design with 17 mm inner diameter and 12 mm bearing width
• Max belt width: 06 rib
• Direct-fit application coverage for select Hyundai Sonata, Tucson, Santa Fe Sport, and Kia Sportage, Optima, Sorento, Forte, and Forte Koup models
• Dayco part number 89577

Detailed Description

This Dayco accessory drive belt idler pulley is engineered for vehicles using a 6-rib serpentine belt layout. The polymer pulley construction helps maintain proper belt tracking while the single-bearing design supports consistent rotation in the accessory drive system. Dayco 89577 is listed for upper and lower positions depending on the vehicle application, including Hyundai Sonata, Hyundai Tucson, Kia Optima, Kia Sorento, Kia Sportage, Kia Forte, and Kia Forte Koup coverage.

Fitment includes 2010-2017 Hyundai and Kia applications, with position-specific coverage such as Fits 2011-2017 Kia Sportage, Upper; Fits 2012-2015 Hyundai Sonata, N/A; and Fits 2010-2013 Kia Forte, Lower. If you are searching for a Dayco 89577 idler pulley for a Hyundai Sonata serpentine belt system or a Kia Sportage accessory drive belt repair, this part number is listed for those applications.

What It Is Used For

• Replacing a worn or noisy accessory drive belt idler pulley
• Restoring proper serpentine belt routing and tension path
• Addressing belt squeal caused by pulley bearing wear
• Correcting belt misalignment in upper or lower accessory drive positions
• Supporting service on Hyundai and Kia serpentine belt systems

Installation Notes and Tips

• Verify pulley position before ordering: upper, lower, or N/A as listed for the vehicle
• Confirm the belt is a 6-rib serpentine belt and the pulley width matches the application
• Inspect the belt, tensioner, and adjacent pulleys during replacement
• Check bearing smoothness and pulley alignment before final assembly
• Use the vehicle-specific fitment listing to confirm the correct Dayco 89577 application

Quality Assurance

Dayco is a recognized name in accessory drive components, and this pulley is built to match the listed OE-style fitment requirements for the specified Hyundai and Kia applications. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.