Question about Hitachi 3 - 1/4" Framing Strip Nailer

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I have an air leak coming for the trigger, what is the proble with my Hitachi?

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Posted on Jan 02, 2017

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SOURCE: air leak

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

Posted on Dec 07, 2008

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SOURCE: Hitachi NR83A air leak

Most all Hitachi nailers that use the plunger style of firing/safety mech will leak air past plunger (part #877-339) when firing, however should not leak when connected to air or resting. If air is leaking past plunger when connnected to air check following:
Remove head to reveal cylinder plate (part#877-318). Remove plate and check outer oring for nicks or broken. If nicked or broken, replace and problem solved. If in good condition, remove cylinder guide (part #877-310) and check two outer orings for nick /cut. Use caution when removing/installing cylinder guide. It is easy to pinch orings when installing causing air leak at plunger. If orings are in good shape then problem is warped body of gun not allowing outer orings to seal. To check for warped body, use the cylinder plate as a guage by lowering it into the area where the cylinder guide rests. Good Luck with your repair.

Posted on Mar 12, 2009

  • 548 Answers

SOURCE: Hitachi 83a Leaking Air from the Trigger

yes my guns i rebuild once a year at least

Posted on Aug 21, 2009

  • 66 Answers

SOURCE: hitachi nail gun nr90ad leaks from trigger when

The nail gun should have came with some lubricating oil. A couple of drops should be installed where you connect the air hose to the nail gun every time you use your nail gun (or per the manufactures specifications) This helps lubricate all the internal o-rings. You may have to put a few drops in and use the gun a bit to get it to seal up. If it still doesn't after that, it may need the o-rings replaced.

Posted on Jan 20, 2010

  • 5 Answers

SOURCE: 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

Posted on May 04, 2010

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1 Answer

How to replace the trigger on a hitachi nv45ab2


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.
airnailerparts.com

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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

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Hitachi framing gun leaks air from trigger when pulled


use the lube that came with the kit, you can replace everything correctly but if oring gets pinched it will still leak

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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

Hitachi NR83 leaks from trigger


There are actually two trigger areas on this tool. There is the main trigger that uses an aluminum valve housing, plastic valve, a plastic ball, and most importantly a round, rubber seal under the ball. It is not an o-ring and often it gets bad which will cause the leak. Then there is a secondary trigger that the safety activates. Leaking air from there can be from a number of problems. Here is a diagram of your tool which will help you see what I am referring to.

http://www.toolpartsdirect.com/cgi-bin/schematic.cgi/hitachi/NR83A2_A2S_E2

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1 Answer

My hitachi nr 83a leaks air at the trigger


Often a trigger leak in the NR83A is caused by a bad gasket in the head #877-327. If this is improperly installed, cracked, or overcompressed it will cause the trigger to leak.
It is uncommon for the trigger itself to be the problem.

Sep 24, 2010 | Hitachi Nr83a- Strip Nailer-driver Blade...

1 Answer

When I take the trigger apart and then put it back in the same way it then leaks air. I have 4 guns and I have been carefully cleaning them. Each time I take the trigger parts out and clean them and...


I believe that the most popular roofing gun for professionals is the hitachi line of nailers. Hitachi guns are amoung the very few however that actually move the cylinder when fired instead of the headvalve. This is rather odd because it requires more moving parts. Your guns have a trigger pin/plunger (white plastic with small oring part # 878-121) that pushes on a urethane ball. This ball is potential cause of leaks. Make sure that the ball is perfect. Replace as needed. Most leaks around the trigger area are acutally coming from just in front of trigger which is plunger pushed by safety foot. Spray soapy water around trigger area and make sure where air is actually leaking. If leaking from safety foot plunder source of leak is actually orings inside of gun around cylinder. (usually oring part #876-161 that fits on the cylinder plate). Parts and parts lists are at www.toolpartsdirect.com. Good luck with your guns and post again if you have other question.

Jul 29, 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

Air leak


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

Dec 06, 2008 | Hitachi NR83A2 2" To 3 1/4" Full Head...

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