How to Repair a Senco Nail Gun

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Senco nail guns increase the productivity of wood workers and carpenters. Normal wear and tear on these tools causes a few common performance issues to appear, which can usually be identified and fixed. If proper replacement parts are purchased and installed as required by the user, the Senco nail gun will provide excellent performance for many years.

Things You'll Need

  • Screwdriver set
  • Schematic of particular model nail gun (included with owners manual)
  • Rags
  • Machine oil
  • SAE socket set
  • Allen wrench set
  • Fine steel wool
  • Disconnect the nail gun from the air supply. Remove all nails or nail strips from inside the nail gun. Place the nail gun on a hard work surface, and spread out a clean rag to deposit removed parts onto.

  • Check the O ring seals that maintain high pressure conditions within the gun. Remove the head cap, then look for cracks or deformities in the head valve or head cap assemblies. Visually inspect the O rings and look for cracks or other damage that may cause an air leak from the exhaust port. Replace any worn or cracked parts. Reattach the head cap.

  • Check the O rings that pressurize the trigger system. Remove the side cover, then look for cracks or deformities in the trigger assembly. Visually inspect the O rings and look for cracks or other damage that may cause an air leak from the trigger seat. Replace any worn or cracked parts.

  • Check the O rings that pressurize the cylinder and main power system. Remove the main cylinder, then look for cracks or deformities in the cylinder walls or piston assembly. Visually inspect the O rings and look for cracks or other damage that may cause an air leak from the main cylinder. Replace any worn or cracked parts. Reattach the main cylinder and side housing.

  • Check the strip angle of the nails being used in the nail gun. Incompatible strip angles may exist if Senco nails are not being used. Senco nail guns require a 34 degree nail angle if nails are held together by paper components and 22 degrees nail angle if nails are held together by plastic components.

  • Disassemble the driver blade mechanism. Even with adequate air pressure, if the driver blade is slightly bent or heavily scratched it will not return completely to the neutral position, making it unable to collect the next nail in the strip. Inspect the driver blade shaft for straightness. Replace it if it is bent heavily scratched or excessively worn. Assemble the driver blade mechanism.

  • Lubricate all moving parts with a very small application of machine oil. Remove any visible rust with fine steel wool and oil. Wipe all parts with a clean rag.

Tips & Warnings

  • Always use Senco nails for best performance.

References

  • Photo Credit Nail Strip image by john parli from Fotolia.com
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