Question about Hitachi NV45AB2 Roofing Coil Nailer

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Why is myhitachi nv45ab just rebuilt and leaks air from exhaust port

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Posted on Jan 02, 2017

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SOURCE: i have a nv45ab roofing

Hitachi nailers use an unusual design of actually moving the cylinder to fire instead of moving the headvalve. If the cylinder gets stuck in the open position (down), air will leak out of the head. To reset the cylinder, remove the nails and connect air supply. With air connected, lightly rap the head of the nailer against coiled air hose or soft rubber (too hard of a hit could damage the head). If after a couple of hits air still leaks, remove head and check headvalve for cracks. Replace as needed. If headvalve rubber looks ok, remove cylinder and clean/lube. If cylinder has fine scratches where orings make contact, sand smooth with 400 grit sandpaper. Lube with silicone paste, white grease or nailer oil.

Posted on Aug 02, 2011

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I have a nv45ab roofing nailgun & it blows air out of exhaust on top any sug.


Hitachi nailers use an unusual design of actually moving the cylinder to fire instead of moving the headvalve. If the cylinder gets stuck in the open position (down), air will leak out of the head. To reset the cylinder, remove the nails and connect air supply. With air connected, lightly rap the head of the nailer against coiled air hose or soft rubber (too hard of a hit could damage the head). If after a couple of hits air still leaks, remove head and check headvalve for cracks. Replace as needed. If headvalve rubber looks ok, remove cylinder and clean/lube. If cylinder has fine scratches where orings make contact, sand smooth with 400 grit sandpaper. Lube with silicone paste, white grease or nailer oil.

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1 Answer

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Hitachi nv45 series is the most popular line of nailers amoung professional roofers. There are three areas that develop leakes. Leak out head vent indicates cylinder stuck in lower position or headvalve worn. With air connected, gently rap head of gun against rubber mat to move cylinder to position. (Use caution not to damage head). If this action works, gun needs cleaning internally or lack of oil. If air still leaks out vent remove head and examine valve in head and replace as needed. Check that cylinder moves freely up/down (travel aprox 1/4"). If cylinder is hard to move pull cylinder and clean replacing orings as needed. If leaking around trigger, remove rollpin and trigger and check nylon ball for pits and replace as needed. If leaking around base of gun check for loose bolts and/or worn gaskets. Remove nail canaster to check feed piston gasket and screws. Good luck with your repair and post again if you have other question.

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1 Answer

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1 Answer

Rebuilt nail gun and now it just blows air out the exhaust port


This probably is the problem,

The cylinder that the piston moves up and down inside is probably to low, and not making contact with the rubber piece in the head cap.

The cylinder has a spring that allows for movement up and down, take a pliers and gently pull up the cylinder if it does not move freely on its own. It will stop when it reaches the cylinder plate ( the part with 2 screw holes for easy removal). Be careful not to mar the cylinder though.

When reassembling the cylinder should make contact with the head cap. Hope that works!


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