Gates 38779 Accessory Drive Belt Tensioner Assembly

OE Automatic Belt Tensioner for Volvo Accessory Drive Systems

The Gates DriveAlign Premium OE Automatic Belt Tensioner, part number 38779, is built for Volvo accessory drive belt systems that require OE exact fit and function. It uses a thermoplastic body with a smooth backside pulley to maintain proper belt tension and consistent belt tracking.

Gates DriveAlign Premium OE Automatic Belt Tensioner line focuses on OE-style replacement parts manufactured to tight tolerances for accurate fitment on the vehicle’s accessory drive system. This 38779 tensioner is a direct replacement choice for Volvo S60, XC60, XC90, and related models listed below.

Key Features

• OE Exact comparison rating for factory-style fit and operation
• Thermoplastic construction for the tensioner assembly
• Single smooth/backside pulley for V-ribbed belt applications
• Three mounting holes for secure installation
• OE-focused design from Gates DriveAlign Premium OE Automatic Belt Tensioner
• Part number 38779 for easy identification

Detailed Description

This automatic belt tensioner assembly is engineered for the accessory drive belt system and is specified with a 65 mm outside diameter pulley, 24 mm width, and 17 mm bearing bore inside diameter. The pulley is non-flanged and uses a smooth contact surface for backside belt routing, which is common in modern V-ribbed belt systems. Gates manufactures this tensioner to rigid tolerances so the replacement matches OE fit, form, and function on the vehicle.

Compatible With Volvo applications including 2014-2021 Volvo V60, 2015-2021 Volvo S60, 2015-2021 Volvo XC60, 2017-2022 Volvo XC90, and 2019-2022 Volvo XC40. It also fits 2017-2022 Volvo V60 Cross Country, 2018-2021 Volvo V90, 2018-2019 Volvo S90, 2018-2019 Volvo V90 Cross Country, 2017-2018 Volvo S60 Cross Country, 2015-2016 Volvo S80, and 2015-2016 Volvo XC70. Part number 38779 is also cross-referenced as 31460372 for the same application.

What It Helps Solve

• Loss of proper accessory belt tension
• Belt noise from a worn or weak tensioner
• Uneven belt tracking on the drive system
• Accessory drive belt vibration or flutter
• Replacement needs on high-mileage Volvo belt drive systems

Installation Notes and Tips

Verify belt routing, pulley alignment, and mounting-hole location before installation. Inspect the accessory drive belt, idler pulleys, and related components for wear at the same time, since a worn belt system can shorten the service life of the new tensioner. Confirm vehicle application by year, make, and model before ordering.

Quality Assurance

Gates is a global OE system designer, and the DriveAlign Premium OE Automatic Belt Tensioner line is manufactured to OE-level specifications for fit, form, and function. The 38779 tensioner is built to match the requirements of the listed Volvo applications.