Hayden 5999 Accessory Drive Belt Idler Pulley

Hayden 5999 Accessory Drive Belt Idler Pulley

The Hayden 5999 accessory drive belt idler pulley is a steel, black-finished replacement pulley for flat back and serpentine belt systems. It is built as an idler/tensioner pulley with a smooth groove surface and meets or exceeds OEM requirements for the listed Ford Super Duty and Excursion applications.

Use this Hayden pulley when servicing the accessory drive belt system on Ford E-350 Super Duty, F-250 Super Duty, F-350 Super Duty, and Excursion models with the correct dual alternator or smooth pulley setup. The Hayden Pulley line focuses on direct-fit belt drive components for common OE-style service needs.

Key Features

• Part number: 5999
• Steel construction with black finish
• Smooth idler/tensioner pulley design
• For flat back / serpentine belt systems
• Outside diameter: 3.500 in. (90.0 mm)
• Pulley width: 1.50 in. (38.1 mm)
• Bore diameter: 0.67 in. (17 mm)
• Meets or exceeds OEM requirements
• Mounting hardware not included

Detailed Description

Hayden 5999 is an accessory drive belt idler pulley engineered for OE-style belt routing and tension management. Its smooth pulley face is sized for serpentine and flat back belt applications, while the steel body and black coating provide a durable service replacement for the accessory drive system. This part cross-references Gates 36354 for the same application.

Compatible With 2004-2010 Ford E-350 Super Duty, w/ Dual Alternator; Pulley; 2004-2010 Ford F-250 Super Duty, w/ Dual Alternator; Pulley; 2008-2010 Ford F-350 Super Duty, w/ Dual Alternator; Pulley; 2004 Ford F-350 Super Duty, w/ Dual Alternator; Pulley; 2005-2007 Ford F-350 Super Duty, Smooth Pulley; Pulley; 2003 Ford F-350 Super Duty, Smooth Pulley; Pulley; 2003-2005 Ford Excursion, Smooth Pulley; Pulley; 2003 Ford F-250 Super Duty, Smooth Pulley; Pulley.

What It Helps Address

• Belt noise from a worn idler pulley
• Uneven belt tracking in the accessory drive system
• Visible pulley wear or surface damage
• Loss of proper belt routing support
• Service replacement for OE-style pulley wear on Ford Super Duty and Excursion models

Installation Notes and Tips

Verify pulley diameter, bore size, belt type, and mounting hole dimensions before installation. Confirm the vehicle’s belt routing and alternator configuration match the listed application, especially on Ford F-250 Super Duty, F-350 Super Duty, and E-350 Super Duty models. Mounting hardware is not included, so reuse or source the correct hardware as needed.

Quality Assurance

Hayden 5999 is listed as meeting or exceeding OEM requirements and is backed by Hayden’s pulley product line standards for accessory drive belt service parts.