Question about Hitachi NV45AB2S Coil Roofing Nailer

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I have been rebuilding Hitachi nalers for about 2 years now and this one has me stumped. It works fine if you single shoot it. If you hold the trigger and try to bounce shoot the nails, the driver will not return fast enough.

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  • Hitachi Master
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The roofers that frequent my shop want their nailers to work like machine guns. Here is what I do to make the hitachi 45 nail fast. Remove the cylinder and sand the fine scratches where orings meet cylinder. I use a rubber slug with a small bolt through the center. The rubber slug fits snuggly into the cylinder and the bolt into chuck of drill. Turn the cylinder with the drill while holding fine sandpaper against the scratches untill smooth. remove the nose from body and replace the sheet (part # 877125) and the bumper. If the sheet fits loose on the driver and the bumper has cuts or missing pieces, the driver will not return with full force. also the oring on the piston should not be too tight. Just snug enough to hold the weight of the piston. While nose piece is off check the air passage to feed piston for trash, use a small wire and push through to make sure. Make sure the orings on the feed piston fit snug. Actually push the feed piston by hand in the nose piece to make sure the three orings fit snugly. A loose feed piston will reduce nailing speed. Finally replace the boot on the firing pin. If the boot is blown off its seat with use replace the firing pin. A loose firing pin will waste air and lower pressure reducing nailing speed. Good luck

Posted on Dec 02, 2008

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1 Answer

Driver not return


How old is the nailer. If it is old enough and not oiled each use, O rings get damaged and will leak air at piston and trigger valve. Depending on the brand a rebuild kit may be available with new O rings and trigger valve.

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Most nailers have a two position setting on the trigger to allow for single fire or bump fire. If set on bump fire, the gun will work better when you bump fire the gun instead of placing the gun on the work then depress trigger. Bump fire works best when safety spring has good tension. Easy test. Make sure that the safety spring is in place (with air hose removed, contact foot should spring back quickly when pushed against work). With air connected, hold trigger and quickly bounce the gun against the work. If the gun does not fire when you bump, the trigger is most likely set to single fire. With trigger set to single fire, you must place the gun against the work, then depress trigger. If the gun shoots two nails while set to single fire, most likely worn trigger or worn out trigger valve. These parts are not expensive and are easy to replace. Good luck

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If you do not have a parts list for your gun, look that the page below for reference:

http://www.toolpartsdirect.com/cgi-bin/schematic.cgi/hitachi/nr83a2

Reference #66 is the trigger plunger and #67 is the oring seal.

Leak when you press trigger is most likely due to bad or missing oring on the trigger plunger (white plastic pin under trigger). Remove the roll pin (3mm) holding the trigger and remove the plunger. Replace the oring as needed. If you would like to use generic part. Lowes oring #60 sold in the plumbing department (small package of 10 orings about $2) works fine. Good luck

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1 Answer

Nail gun shoots 2-3 nails, not one. last week 2 of them hit me in the thumb. has been doing this for years. I have put up with it because I did not know what to do about it.


Most nailers work better by bump firing the gun. Less likely to double fire. This is a common problem amoung brands. If you place nailer on work then trigger, you may/will have problems as you describe. There is usually an option of triggers or builtin method of single firing the gun. With single fire trigger, you can place gun on work and fire. The will not reset for next round untill you let go of trigger and lift gun off the work. If your gun is double firing even with bump method, then replace the trigger valve.

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Several models of hitachi nailers share the same orings and other parts including the check ball under the trigger pin in your gun. Remove the roll pin holding the trigger to release the trigger pin, (plastic with one oring) then remove the valve with a screwdriver. Replace the vinyl check ball and seal. Parts are available at www.toolpartsdirect.com. This should fix the problem that you are describing, however use caution and check that the safety if properly adjusted. Enjoy

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