9SS27978-58 - Lincoln Viking 1740 Outside Lens Gasket Seal

Protect Your Equipment with Genuine Lincoln Parts

The Lincoln Outside Lens Replacement Seal (9SS27978-58) is an essential maintenance component designed exclusively for the Lincoln Viking 1740 Series welding helmets. In the harsh environment of industrial welding, the integrity of your personal protective equipment is paramount. While the cover lenses take the brunt of the heat and spatter, the seal that sits beneath them plays a quiet but critical role in protecting the heart of your helmet: the Auto-Darkening Filter (ADF).

Over time, heat cycles and exposure to shop environments can cause the original rubber seals to dry out, crack, or lose their elasticity. When this happens, the barrier between the outside world and your ADF is compromised. This replacement seal restores that barrier, ensuring that fine metallic dust, welding fumes, and grinding debris cannot bypass the cover lens. By preventing these contaminants from reaching the ADF, you avoid the risk of permanent damage to the liquid crystal display and sensors, which are costly to replace.

Installation is straightforward and should be performed whenever the existing seal shows signs of wear or deformation. This genuine Lincoln Electric part guarantees a perfect fit within the helmet shell groove, eliminating gaps that generic universal seals might leave. Maintaining a proper seal not only protects your investment but also ensures that your view remains unobstructed by internal dust buildup, allowing for precise weld placement and superior quality control.

Key Benefits for Industrial Users

• Cost Savings: Extends the life of the expensive ADF unit by preventing contamination.
• Perfect Fit: OEM engineering ensures the seal matches the specific contours of the Viking 1740.
• Improved Visibility: Keeps the space between the cover lens and ADF clean and clear.