Question about Hitachi NV45AB2 Roofing Coil Nailer

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Air is leaking through trigger when trigger is not depressed. When trigger is depressed and nail tail cover is in safety position (holding gun in air) it completely stops. The gun fires well but there is just a significant amount of air escaping when trigger is not depressed. Could it be the valve packing near the urethane ball in trigger?

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  • 2,176 Answers

Could be either that or a damaged o ring, when was the last time serviced, all o rings replaced?? could be that the tool needs a thorough cleaning and new one installed. it is not hard

Posted on Aug 26, 2010

  • 1woodworking Aug 26, 2010

    Thanks for the advise. The gun really has very little use although almost 10 years old. I think it may be time for a thorough interior cleaning/maintenance. Do you know if there are kits that include necessary O rings and frequently serviceable parts?

  • David Ford
    David Ford Aug 27, 2010

    yes there are, the kits that I installed had everything except for the lube for the O rings. I suggest yellow pages and finding a Hitachi dealer near you or you can get them online from Hitachi

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