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How to replace the trigger on a hitachi nv45ab2

Blows air out the trigger and need to know how to change the trigger on the hitachi nv45ab2

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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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Posted on Dec 04, 2014

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Hitachi 45ab blowing air out of trigger


If air leaks thru trigger as soon as you connect airline, replace the vinyl ball under the trigger stem. If air leaks when you depress the trigger, replace the small oring on the trigger stem. If air leaks slightly from plunger in front of the trigger valve, problem is inside of the gun. Remove the head and pull the large circular plate. Replace the large outer oring. Good luck

Feb 10, 2014 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

Blowing air out of trigger


Leaking under trigger could be the ball seal part # 875645 if leak starts as soon as you connect the air hose. If no air leaks when you connect hose but begins to leak when you depress the trigger then replace the oring on the plunger which is part # 874820. If air leaks when you connect the hose and the ball mentioned above is good then most likely is leaking from oring # 876161 installed on cylinder plate (remove head and pull out the plate). Good luck.

Feb 10, 2014 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

My Hitachi NV45AB is leaking air from the trigger air valve. The gun still works if I just keep the trigger depressed and just smack the tip into the shingle.


Remove the 3mm roll pin holding the trigger in place and set aside the trigger plunger (white plastic plunger should have an oring on groove). Remove the fitting that holds the trigger plunger and replace vinyl ball #875645 or check for debris under ball. Good luck with your repair.

Apr 19, 2013 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

My hitachi roofing gun leaks air from trigger when not pressed


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.

Jun 05, 2012 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

Air is leaking through trigger when trigger is not depressed. When trigger is depressed and nail tail cover is in safety position (holding gun in air) it completely stops. The gun fires well but there is...


could be either that or a damaged o ring, when was the last time serviced, all o rings replaced?? could be that the tool needs a thorough cleaning and new one installed. it is not hard

Aug 26, 2010 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

Air leaking aroung the trigger assembly from my Hitachi NR83A


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

Apr 27, 2010 | Hitachi NV45AB2S Coil Roofing Nailer

1 Answer

I just rebuilt the nail gun with all new o-rings and gaskets and when I put the air to it air actually blows the rubber boot off the plunger on the trigger assy.


I am assuming that the boot is blown off when your fire the nailer. This is caused by a loose/worn plunger and valve. If the plunger moves from side to side too much air will flow past the valve and blow off the boot. Most used hitachi nailers will blow this boot. Only way to fix is replace one or both parts. If air leaks past the boot immediately when you connect to air, check oring on plunger A (part# 874-820) or outer orings on cylinder guide and cylinder plate. These outer orings are easy cut while inserting these parts into cylinder. Check orings for nicks. Good luck and post again if you have more questions.

Mar 11, 2010 | Hitachi NV45AB2S Coil Roofing Nailer

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