Hayden 5990 Accessory Drive Belt Idler Pulley

Accessory Drive Belt Idler Pulley for Dual Alternator Applications

The Hayden 5990 accessory drive belt idler pulley is a smooth back idler pulley built for serpentine belt systems that use a dual alternator setup. It is a steel pulley with a black finish, a 3.500-inch outside diameter, and a 1.000-inch belt width profile for direct replacement service on listed Chevrolet, GMC, Cadillac, and Isuzu applications.

Use Hayden 5990 when servicing a worn idler or tensioner pulley on vehicles such as Chevrolet Express, GMC Savana, and Chevrolet/GMC truck and SUV platforms with dual alternators. This part cross-references Gates 38020 for the same application.

Key Features

• Brand: Hayden Pulley
• Part number: 5990
• Accessory drive belt idler pulley / tensioner pulley style
• Smooth pulley design for serpentine belt routing
• Steel construction with black finish
• 3.500-inch outside diameter
• 1.000-inch belt width
• 1 mounting hole; mounting hardware not included
• Meets or exceeds OEM requirements

Product Details

Hayden Pulley 5990 is a back idler pulley for serpentine accessory drive systems. The smooth groove design is specified for applications that route the belt over a non-grooved pulley surface, including many dual alternator configurations. With a 12.0 mm bore diameter and 88.900 mm outside diameter, this pulley is built to match the listed OE-style fitment requirements for service on older GM trucks, vans, SUVs, and select Cadillac and Isuzu models.

Common search terms for this part include accessory drive belt idler pulley for Chevrolet Express 2500, GMC Savana 3500 serpentine belt pulley, and dual alternator idler pulley for Chevrolet C2500 or GMC K2500. The Hayden 5990 part number is also used in cross-reference listings for replacement lookup.

What It Helps Fix

• Squealing or chirping from a worn idler pulley bearing
• Belt tracking issues caused by pulley wear
• Serpentine belt noise during engine operation
• Uneven accessory drive belt movement on dual alternator systems
• Replacement needs for cracked, rough, or seized pulley surfaces

Installation Notes

Verify pulley style, belt width, and outside diameter before installation. This part is listed for smooth pulley applications only and is not for grooved belt routing. Confirm vehicle-specific notes such as dual alternator or air conditioning requirements where shown in the fitment data. Mounting hardware is not included, so reuse or source the correct fastener as needed. Always inspect the belt, tensioner, and adjacent accessory components during service.

Quality Assurance

Hayden 5990 is listed as meeting or exceeding OEM requirements for the specified applications. It is cataloged for fitment across 1986-2002 vehicles, including Chevrolet Express, GMC Savana, Chevrolet C/K trucks, GMC C/K trucks, Cadillac DeVille, and select Isuzu models.

• Fits 2001-2002 Chevrolet Express 2500, N/A
• Fits 2001-2002 Chevrolet Express 3500, N/A
• Fits 2000-2002 GMC Savana 2500, N/A
• Fits 2000-2002 GMC Savana 3500, N/A
• Fits 1996-2000 Chevrolet C2500, N/A
• Fits 1996-2000 Chevrolet C3500, N/A
• Fits 1996-2000 Chevrolet K2500, N/A
• Fits 1996-2000 Chevrolet K3500, N/A
• Fits 1996-2000 GMC C2500, N/A
• Fits 1996-2000 GMC C3500, N/A
• Fits 1996-2000 GMC K2500, N/A
• Fits 1996-2000 GMC K3500, N/A
• Fits 1996-1999 Chevrolet C1500 Suburban, N/A
• Fits 1996-1999 Chevrolet C2500 Suburban, N/A
• Fits 1996-1999 Chevrolet K1500 Suburban, N/A
• Fits 1996-1999 Chevrolet K2500 Suburban, N/A
• Fits 1996-1999 Chevrolet Tahoe, N/A
• Fits 1997-1999 GMC Savana 2500, N/A
• Fits 1997-1999 GMC Savana 3500, N/A
• Fits 1996-1998 Chevrolet C1500, N/A
• Fits 1996-1998 Chevrolet K1500, N/A
• Fits 1996-1998 GMC K1500, N/A
• Fits 1996-1997 GMC C1500, N/A
• Fits 1996-1997 GMC C1500 Suburban, N/A
• Fits 1996-1997 GMC C2500 Suburban, N/A
• Fits 1996-1997 GMC K1500 Suburban, N/A
• Fits 1996-1997 GMC K2500 Suburban, N/A
• Fits 1996-1997 GMC Yukon, N/A
• Fits 1986-1995 Cadillac DeVille, N/A
• Fits 1995 Chevrolet C1500, N/A
• Fits 1995 Chevrolet C1500 Suburban, N/A
• Fits 1995 Chevrolet C2500, N/A
• Fits 1995 Chevrolet C2500 Suburban, N/A
• Fits 1995 Chevrolet C3500, N/A
• Fits 1995 Chevrolet G20, N/A
• Fits 1995 Chevrolet G30, N/A
• Fits 1995 Chevrolet K1500, N/A
• Fits 1995 Chevrolet K1500 Suburban, N/A
• Fits 1995 Chevrolet K2500, N/A
• Fits 1995 Chevrolet K2500 Suburban, N/A
• Fits 1995 Chevrolet K3500, N/A
• Fits 1994-1995 Chevrolet P30, N/A
• Fits 1995 Chevrolet Tahoe, N/A
• Fits 1995 GMC C1500, N/A
• Fits 1995 GMC C2500, N/A
• Fits 1995 GMC C3500, N/A
• Fits 1994-1995 GMC G2500, N/A
• Fits 1994-1995 GMC G3500, N/A
• Fits 1995 GMC K1500, N/A
• Fits 1995 GMC K2500, N/A
• Fits 1995 GMC K3500, N/A
• Fits 1994-1995 GMC P3500, N/A
• Fits 1995 GMC Yukon, N/A
• Fits 1994 Chevrolet G20, N/A
• Fits 1994 Chevrolet G30, N/A
• Fits 1991-1994 Isuzu Pickup, N/A
• Fits 1993 Cadillac 60 Special, N/A
• Fits 1986-1993 Cadillac Eldorado, N/A
• Fits 1986-1993 Cadillac Seville, N/A
• Fits 1987-1993 Chevrolet S10, N/A
• Fits 1991-1993 GMC Sonoma, N/A
• Fits 1987-1992 Cadillac Allante, N/A
• Fits 1986-1992 Cadillac Fleetwood, N/A
• Fits 1991-1992 Isuzu Rodeo, N/A
• Fits 1989-1991 Isuzu Trooper, N/A
• Fits 1988-1990 GMC S15, N/A
• Fits 1986-1989 Chevrolet S10 Blazer, N/A
• Fits 1986-1989 GMC S15 Jimmy, N/A