National 710830 Automatic Transmission Oil Pump Seal - Front

Overview of National 710830 Automatic Transmission Oil Pump Seal

The National 710830 automatic transmission oil pump seal is engineered for reliable sealing performance in various BMW and General Motors vehicles. Designed with precision dimensions and durable fluoro-elastomer material, this oil seal helps maintain transmission fluid integrity and prevent leaks.

• Inside diameter options: 1.835 inch (46.6 mm)
• Outside diameter: 2.878 inch (73.1 mm)
• Flanged outside diameter: 2.992 inch (76 mm)
• Thickness: 0.283 inch (7.2 mm)
• Counter-clockwise spiral lip design for enhanced sealing
• Material: Fluoro-elastomer for chemical and heat resistance
• Compatible with multiple BMW and GM models

Technical Specifications and Design Features

This National 710830 oil seal features a counter-clockwise spiral lip design that improves sealing efficiency by maintaining consistent contact with the shaft. The fluoro-elastomer sealing material offers excellent resistance to transmission fluids, heat, and wear, ensuring long service life. With an inside diameter of 1.835 inches and an outside diameter of 2.878 inches, this seal fits precisely into the housing bore of 2.874 inches, providing a secure fit. The flanged outside diameter of 2.992 inches allows for easy installation and proper seating within the transmission assembly.

Compatible Vehicles and Applications

This automatic transmission oil pump seal is compatible with a range of BMW models including the 128i, 328i, 328i xDrive, 328xi, 525i, 525xi, 528i, 528i xDrive, 528xi, 530i, 530xi, 550i, 750i, 750i xDrive, 750Li, 750Li xDrive, X3, and Z4. It also fits various General Motors vehicles such as Cadillac ATS, Chevrolet Avalanche, Camaro, Colorado, Corvette, Express 2500/3500, GMC Canyon, Sierra 1500/2500/3500 HD, Hummer H2, Pontiac G8, and Yukon models including Yukon XL 1500 and 2500.

Common Issues Addressed by the National 710830 Seal

• Prevents automatic transmission fluid leaks around the oil pump shaft
• Reduces risk of transmission overheating due to fluid loss
• Maintains proper hydraulic pressure within the transmission system
• Minimizes contamination ingress to protect transmission components
• Helps avoid premature transmission wear and costly repairs

Installation Notes and Tips

Ensure the transmission housing bore is clean and free of debris before installing the National 710830 seal. Use appropriate tools to press the seal evenly into place without damaging the flanged edge or sealing lip. Verify the shaft diameter matches the 1.835 inch specification for proper fit. Lubricate the seal lip lightly with transmission fluid prior to installation to reduce initial wear. Follow vehicle-specific service manual instructions for disassembly and reassembly procedures.

Quality Assurance and Warranty Information

Manufactured by National, a trusted brand in transmission sealing systems, the 710830 oil pump seal meets industry standards for durability and performance. The fluoro-elastomer material is selected for its resistance to heat and chemical degradation, ensuring reliable operation under demanding conditions. While specific warranty details may vary, National products typically come with a limited warranty against defects in material and workmanship.