Dorman 300-551 Power Steering Pump Pulley

Overview of the Dorman Power Steering Pump Pulley 300-551

The Dorman 300-551 power steering pump pulley is designed for reliable performance in Nissan vehicles including the Altima, Frontier, and Sentra. Constructed from durable steel with a black finish, this pulley is engineered to meet standard replacement requirements for power steering systems.

• Material: Steel for strength and durability
• Color: Black finish for corrosion resistance
• Groove Quantity: 6 grooves compatible with serpentine belts
• Outside Diameter: 5.08 inches for precise fitment
• Mounting Hole Quantity: Single mounting hole for secure installation
• Belt Type: Designed for serpentine belt systems
• Package Contents: Includes the pulley only, no mounting hardware
• Item Grade: Standard replacement quality
• Pulley Bore Diameter: 15 mm

Detailed Product Description

The Dorman 300-551 power steering pump pulley is specifically engineered to restore proper function to the power steering system of Nissan Altima, Frontier, and Sentra models. Its steel construction ensures long-lasting durability under typical driving conditions. The black finish helps resist corrosion and wear, maintaining the pulley’s integrity over time. Featuring six grooves, this pulley is compatible with serpentine belt systems commonly found in these Nissan vehicles. The 5.08-inch outside diameter and 15 mm bore size provide a precise fit, ensuring smooth operation and alignment with the power steering pump shaft. This pulley is a standard replacement part, designed to meet OEM specifications without including mounting hardware or installation instructions.

Common Applications and Issues Addressed

• Replacement for worn or damaged power steering pump pulleys
• Eliminates belt slippage caused by pulley wear
• Resolves unusual noises from the power steering pump area
• Restores proper belt alignment and tension
• Prevents premature belt or pump failure due to pulley defects

Installation Notes and Tips

Installation of the Dorman 300-551 pulley requires removal of the existing pulley from the power steering pump shaft. Since mounting hardware is not included, retain or replace bolts as needed. Proper alignment of the pulley grooves with the serpentine belt is critical to avoid belt wear or slippage. Use appropriate tools to press the pulley onto the pump shaft without damaging the bore or grooves. Refer to vehicle-specific service manuals for torque specifications and detailed installation procedures.

Quality Assurance and Warranty

Dorman power steering pump pulleys are manufactured to meet or exceed industry standards for standard replacement parts. The 300-551 pulley undergoes quality checks to ensure dimensional accuracy and material integrity. While mounting hardware and installation instructions are not included, the part is backed by Dorman’s limited warranty against defects in material and workmanship. This warranty provides assurance of the product’s reliability when installed according to manufacturer guidelines.