Dorman 300-138 Power Steering Pump Pulley

Overview of Dorman Power Steering Pump Pulley 300-138

The Dorman 300-138 power steering pump pulley is engineered for reliable performance in select Buick, Chevrolet, GMC, Isuzu, Oldsmobile, and Saab vehicles. Designed with durable steel construction and a black finish, this pulley supports serpentine belt systems with six grooves for optimal belt engagement.

• Constructed from durable steel material for strength and longevity
• Black color finish for corrosion resistance and appearance
• Six-groove design compatible with serpentine belts
• 6.14-inch outside diameter for precise fitment
• Single mounting hole with 0.748-inch bore diameter
• Standard replacement grade for dependable operation
• Includes pulley only; mounting hardware and installation instructions not included

Detailed Product Description

The Dorman 300-138 power steering pump pulley is a direct replacement component designed to restore proper function to the power steering system in compatible vehicles. Its steel construction ensures durability under continuous stress, while the black finish helps resist corrosion. The pulley features six grooves to accommodate serpentine belts, which are common in the specified Buick, Chevrolet, GMC, Isuzu, Oldsmobile, and Saab models such as the Trailblazer, Envoy, Bravada, and 9-7x. With an outside diameter of 6.14 inches and a bore size of 0.748 inches, this pulley matches OEM specifications for a secure and accurate fit. The single mounting hole design simplifies installation when paired with the existing hardware.

Compatible Vehicles and Applications

• Buick Rainier
• Chevrolet Trailblazer
• GMC Envoy
• Isuzu Ascender
• Oldsmobile Bravada
• Saab 9-7x

This pulley is intended for use in power steering pump assemblies that utilize a serpentine belt system with six grooves, ensuring proper belt alignment and tension.

Common Issues Addressed by This Pulley

• Worn or damaged pulley causing belt slippage
• Noise or squealing from a misaligned or failing pulley
• Power steering pump belt wear due to improper pulley fit
• Loss of power steering assist from pulley failure
• Corrosion or physical damage to the original pulley

Installation Notes and Tips

Installation of the Dorman 300-138 power steering pump pulley requires removal of the old pulley and mounting the new one using the existing hardware. Note that mounting hardware and installation instructions are not included with this part. It is recommended to verify belt alignment and tension after installation to ensure proper operation. Use appropriate tools to avoid damage to the pulley bore or mounting hole during installation.

Quality Assurance and Warranty

This Dorman power steering pump pulley is manufactured to meet standard replacement quality requirements. It undergoes quality checks to ensure dimensional accuracy and material integrity. While specific warranty details are not provided, Dorman parts typically come with a limited warranty covering defects in material and workmanship. Consult the product packaging or Dorman’s official resources for exact warranty terms.