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Pound roll pin out of black trigger and remove. Turn silver slotted part with screw driver and the two valves will pop out. Usually it's the flat trigger bushing that is bad and makes it leak. I have all parts.
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Two areas to check when air leaks from around the trigger. Rubber ball under trigger pin will cause air to leak, however when good side of the ball falls on the seat, air will not leak for a while. If air is leaking from plunger pin (just in fromt of the trigger pin), remove the head and pull out the cylinder plate to reveal broken oring (oring part # 876161). Good luck with your repair project.
you can first try "tapping" on the cap with a soft hammer while air plugged in to seat the cylinder and if the air doesn't go away then you might have pinched an o ring while assembling. Also while assembling did you lube the o rings so that they slide and don't roll out of the grooves. Let me know if you need more assistance.
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.
if you took the trigger apart the part that you unscrew has a nylon ball and a black rubber ring you should check them and make sure that you didn't loose them when you took it apart,if they are there, then you need to service the gun, and after you clean all the moving part and you put it back together, it may still leak from the top,Take a rubber hammer and give it a good hit,now not to hard, and it should seal
Hitachi nailers are built on very close tolerences. Dirt /grit will prevent cylinder from resetting causing air to leak out of top of gun. You can force a reset by striking the gun head first against a rubber mat. Only one or two hits because you could damage the head. If the gun does not reset you will have to take apart and clean out grit and replace orings as needed. Good Luck and post again if you have other questions.
on hitachi air nailers the first number is the month and the second is the year , the only confusion might be if the nailer is older than ten yrs( the nv45ab2 has only been out about 4 yrs) so your roofer was made in march of 04
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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