National 8773S Power Steering Pump Shaft Seal

Power Steering Pump Shaft Seal Overview

The National 8773S Power Steering Pump Shaft Seal is engineered to provide reliable sealing performance for a variety of vehicles including Cadillac, Chevrolet, Ford, and more. Designed with precision dimensions and durable nitrile material, this oil seal helps maintain system integrity and prevent fluid leaks in power steering pumps.

• Inside diameter: 0.687 inch (17.45 mm)
• Outside diameter: 1.254 inch (31.85 mm)
• Thickness: 0.250 inch (6.35 mm)
• Material: Nitrile for resistance to oil and wear
• Helix type: Clockwise-spiral lip design for effective sealing
• Compatible housing bore: 1.250 inch (31.75 mm)
• Part number: 8773S

Detailed Product Description

The National 8773S power steering pump shaft seal is part of the 8000 series and is specifically designed to fit a wide range of vehicles such as the Ford Mustang, Chevrolet Impala, Cadillac DeVille, and Dodge Charger. Its nitrile construction offers excellent resistance to hydraulic fluids and wear, ensuring long-lasting performance. The seal features a clockwise-spiral lip design that enhances sealing efficiency by preventing fluid leakage around the pump shaft. With precise inside and outside diameters, this seal fits housing bores of 1.250 inches, making it suitable for many power steering pump applications.

Common Applications and Issues Addressed

• Prevents power steering fluid leaks from the pump shaft
• Reduces contamination ingress into the power steering system
• Maintains hydraulic pressure for consistent steering performance
• Helps avoid premature pump wear due to fluid loss
• Addresses seal failure symptoms such as whining noises or steering difficulty

Installation Notes and Tips

• Ensure the housing bore and shaft are clean and free of debris before installation
• Lubricate the seal lip with power steering fluid to ease installation and prevent damage
• Use proper tools to press the seal evenly into the housing bore without distortion
• Verify correct orientation of the clockwise-spiral lip facing the fluid side
• Inspect the shaft for wear or damage that could compromise seal performance

Quality Assurance and Warranty

National manufactures the 8773S power steering pump shaft seal to meet industry standards for durability and performance. The nitrile material and precise engineering ensure reliable sealing under typical operating conditions. This part is backed by National's quality control processes, providing confidence in fitment and function for compatible vehicles including Cadillac, Chevrolet, Ford, and Dodge models.