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SENCO SN-IV LB3500 Seal leaks air

This gun has a seal at the bottom of the piston which is about 2 1'' in diameter. the old seal was wax and was probably installed by heating it. the new seal is nylon. since this seal must pass over a lip that exceeds its diameter, do I heat this ''nylon'' seal or do I physically
stretch it to install it.

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The old seal was origionally the same as the new one, a white nylon, however over time the seal breaks down and looks like hard wax. The new seal may be installed by heating with hot air gun till plyable and gently streach over lip. While the gun is open, lube with nail gun oil. the piston should not slide down the cylinder under its own weight, if it does, replace the piston oring. Diagram available at senco.com

Posted on Nov 27, 2008

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