Question about Hitachi 1 - 3/4" Coil Roofing Nailer

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The nailer piston on my hitachi roof gun stays out and will only fire 1 out of 15 times. i've tried oiling it, and hear no gasket leaks. what could it be ? dan.......

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There are o-rings in the gun that route air around the cylinder to push the driver back up. One or more of these o-rings are worn or broken. You can get it fixed at a service center or you can go to sites like www.ereplacementparts.com to find a breakdown of your gun and order the parts. Unfortunately Hitachi doesn't make all in one repair kits and if you replace one, replace all of the o-rings.

Posted on Sep 13, 2010

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1 Answer

My hitachi roofing nailer isnt working properly no leaks but whenever I shoot the nail it just spits out as if it had no pressure to it.


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My hitachi nail gun just fire one time and the piston stay out


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My new (used once) hitachi roofing nailer wont feed.when I hand feed it,it has no power.Like theres no air pressure.....Yes the compressor is on. any ideas?


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1 Answer

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SOLVED! I replaced all the o rings put it together and air jus blew out the exhaust port. I made the mistake of pushing Piston plunger cylinder into the gun till it seated. this left a gap between the head and cylinder. I took the gun apart, removed the cylinder, an reinstalled it only far enough to seat past the o ring gasket. I then installed the head and let the head seat the cylinder as I tightened the screws. this worked on two guns with the same problem. Jn 3:17

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I have Bostitch RN45 coil nailer. It sometimes does not feed nails. When I open the magazine the driver blade has not retracted. Gun does not leak, o-rings in drive section look to be in good shape and...


Causes of piston not retracting are as follows. Cracked /worn bumper, if cracked air will leak between piston and bumper. Try test, remove nails and dry fire gun against rubber or soft wood; depress trigger push gun against wood/rubber and hold in this position. Piston should stay down and no air should leak past nose. Worn piston oring, piston should not slide down cylinder under its own weight. Loose or missing check seal, remove cylinder and look for black rubber band around series of holes. Band should be in place and fit snuggly. Good luck

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1 Answer

My brand new hitachi NV45AB2 roofing nailer leaks air through the trigger when it is half depressed. I purchased one and returned it only to find the new one I recieved to replace it does the same thing....


Take off the back cover and make sure it's not too dry inside. Spray the inside with some WD40. You can take off the top cover. Pop the piston, cylinder, and head valve out, making sure all the seals and rings are seated correctly.Sounds like the piston is momentarily sticking. Does it shoot at all? Lemme know. Please rate me

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