Hayden 5909 Accessory Drive Belt Idler Pulley - Left

Accessory Drive Belt Idler Pulley for GM Applications

The Hayden 5909 is an accessory drive belt idler pulley built for serpentine belt systems that require a grooved, 6-rib pulley with OE-style dimensions. It is a black plastic pulley with a 2.750-inch outside diameter and a 1.25-inch width, made to meet or exceed OEM requirements.

Compatible with select Buick, Chevrolet, and Pontiac vehicles, this Hayden pulley is a direct-fit service part for common accessory drive belt system repairs. The Hayden Pulley line focuses on replacement pulleys that match factory-style fitment and dimensions for dependable belt tracking.

Key Features

• Part number 5909 accessory drive belt idler pulley
• 6-groove design for serpentine belt applications
• Plastic construction with black finish
• 2.750-inch outside diameter and 1.25-inch pulley width
• 10.000 mm bore diameter with single mounting hole
• Meets or exceeds OEM specifications
• Direct replacement style for grooved pulley service

Detailed Description

The Hayden 5909 idler pulley is engineered for accessory drive belt systems that use a 6-rib serpentine belt. Its 70.0 mm outside diameter, 31.8 mm width, and 10.000 mm bore help maintain proper belt routing and alignment in factory-style applications. This pulley is commonly used on 2005-2008 Pontiac Grand Prix, left; 2006-2007 Chevrolet Monte Carlo; 2006-2009 Chevrolet Impala; 2008-2009 Buick Allure; and 2008-2009 Buick LaCrosse.

This part cross-references Dayco 89516 and Gates 36303 for the same application. The Hayden 5909 is a practical replacement when servicing a worn or noisy idler pulley in a serpentine belt system.

What It Helps Address

• Squealing or chirping from a worn idler pulley
• Belt tracking issues caused by pulley wear
• Accessory drive belt vibration or rough operation
• Visible pulley damage, cracking, or surface wear
• Service replacement for a grooved serpentine belt pulley

Installation Notes and Tips

Verify pulley diameter, groove count, bore size, and belt width before installation. Mounting hardware is not included, so reuse or source the correct hardware as needed. Inspect the serpentine belt, tensioner, and adjacent pulleys during service to confirm the full belt drive system is in good condition. Confirm vehicle application by year, make, model, and position before ordering.

Quality Assurance

Hayden lists this pulley as meeting or exceeding OEM requirements, supporting factory-style fitment and dimensional accuracy for the specified applications.