Question about Hitachi NV45AB2 Roofing Coil Nailer

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The nailgun only shoots the nail in halfway

Would an air leak cause that? and is it fixable or would i just need to buy a whole new gun?

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  • David Robinson May 11, 2010

    When is the last time you oiled it? What is the pressure your working at?


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The Hitachi nv45 series guns are lifetime guns and parts (parts available at are not too expensive. There should be no air leaks for best results. If air leaks from the trigger area remove the trigger and white plastic plunger. Make sure that the plunger has oring and the ball that the plunger acts against is whole. If air is leaking from the boot around the firing pin then remove the head of the gun and pull off the cylinder ring and check the outer oring. (After you remove the head, the cylinder ring is the part that has two threaded pull points, the outer oring sometimes breaks causing leak) With the head off push the piston all the way down and make sure that the driver extends about 3/16 past barrell. If the end of the driver is wrorn to round shape, you can grind it square if there is enouth length left. If the sheet seal is good the driver will not pull out of the cylinder.(look at parts diag. to find sheet seal, it is below the bumper) If the driver easily pulls out of the cylinder then open the gun from the bottom and examine the bumper and sheet seal and replace as neccessary. If the driver will not pull out of the gun (thats a good thing) then pull up and to side enough to peek/look at the lower bumper to check for cracks or missing pieces. The driver oring should hold the driver in upper position. Check that the top edge of cylinder is smooth and seals against the vinyl part in the head. Use caution not to damage the top edge of cylinder. The oring kit for this gun will cost about $20, however you only have to replace the worn parts for good results. Let me know if your air leak is somewhere other than stated above or other questions. Good Luck

Posted on Jan 23, 2009

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