Dorman 300-139 Power Steering Pump Pulley

Reliable Power Steering Pump Pulley for Select GM Vehicles

The Dorman 300-139 power steering pump pulley is engineered to restore proper belt alignment and power steering function on compatible Buick, Chevrolet, Pontiac, and Saturn models. Constructed from durable steel with a black finish, this pulley is designed for serpentine belt systems requiring a 6-groove configuration.

• Made from sturdy steel material for long-lasting durability
• Black color finish for corrosion resistance
• 6 grooves to accommodate serpentine belt types
• Outside diameter measures 5.781 inches for precise fit
• Single mounting hole with a bore size of 0.7462 inches
• Standard replacement grade for reliable performance
• Package includes the pulley only; mounting hardware and installation instructions are not included

Product Details and Specifications

The Dorman 300-139 power steering pump pulley is designed to meet the specifications required by various GM vehicles, including Buick Rendezvous and Terraza, Chevrolet Impala, Malibu, Montana, Monte Carlo, Relay, and Uplander, Pontiac G6 and G6, and Saturn Aura and Vue. Its steel construction ensures resistance to wear and deformation under normal operating conditions. The 6-groove design is compatible with serpentine belt systems, providing consistent power transfer to the power steering pump. The pulley’s outside diameter of 5.781 inches and bore diameter of 0.7462 inches allow for a precise fit on the power steering pump shaft, ensuring smooth operation and reducing belt slippage.

Compatible Vehicles and Applications

• Buick Rendezvous and Terraza
• Chevrolet Impala, Malibu, Montana, Monte Carlo, Relay, Uplander
• Pontiac G6
• Saturn Aura and Vue

This pulley is intended as a direct replacement for worn or damaged power steering pump pulleys on these specific models, helping to maintain proper steering system function.

Common Issues Addressed by This Pulley

• Eliminates belt slippage caused by worn or damaged pulley grooves
• Restores proper belt alignment to prevent premature belt wear
• Reduces noise and vibration from a failing pulley
• Prevents power steering pump overload due to inefficient belt engagement
• Helps maintain consistent power steering performance

Installation Notes and Tips

Installation of the Dorman 300-139 power steering pump pulley requires removal of the old pulley and proper alignment on the power steering pump shaft. Note that mounting hardware and installation instructions are not included, so having the appropriate tools and reference to a vehicle-specific repair manual is recommended. Ensure the serpentine belt is properly tensioned after installation to avoid belt slippage or noise.

Quality Assurance and Warranty

Dorman power steering pump pulleys are manufactured to meet or exceed OEM standards for fit and function. The 300-139 part is a standard replacement grade component designed for reliable service life. While specific warranty details are not provided, Dorman products typically come with a limited warranty against defects in material and workmanship.