Question about Hitachi Nr90ad Framing Nailer Oring Parts Repair Kit

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Hitachi na90ad leaking from rear and from front where in nail comes out from still fires ok

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  • Alex McGaughan
    Alex McGaughan Mar 21, 2011

    Is it only leaking when you fire the gun or is it constantly when pressurized?


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The seals are wearing out, this is normal ageing, you can buy replacement "0" rings and put them in quite easily

Posted on Mar 22, 2011

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I have a Hitachi NR83A3 framing nail gun. It won't drive nails flush. Adjusting the depth screw from one extreme to the other doesn't appear to help. Any ideas?

Hi Gene,

OK, so there's a factory recall on this one as you understand it. Have you been in contact with Hitachi, or one of their service centres to check this is correct?

If this is NOT the case, it could possibly be that the timber you're using could be too hard??? just for you're own piece of mind, have you tried to fire the same nail into some soft pinewood to see if the result is the same? You've got everything else under control - pressure, leaks etc. so, the timber density may be the issue?

Dec 23, 2014 | Hitachi Air Tools & Compressors

1 Answer

I have a Hitachi NR 83A2 nail gun, it still fires a nail, the firing pin retracts but then slowly comes out and stays out. Is there a seal kit available for this problem?

Sounds like you have worn valves or damaged o-rings. Unfortunately Hitachi does not make a rebuild kit for your nail gun. If you go to you can find an excellent breakdown of your tool and either order the parts you need there or use the part numbers to search the web for prices and availability. Your tool is on the old side and some parts are no longer available.

Feb 26, 2013 | Tools & Hardware - Others

1 Answer

It will not fire nails

Does the motor start when you depress the nose against the work.
Look at the green light near the battery compartment it should flash one when you pull the trigger.
Is the gas in date?
Try warming the gas first by putting it in your pocket for 10 min before use.
You may also have an air leak, when was it serviced last?
Remove the head assy and reconnect to see if it is sparking when you depress the switches. Do not have the gas in whilst doing this.

Feb 06, 2013 | Hitachi Tools & Hardware - Others

1 Answer

Why does my Hitachi nv45ab gun double fire nails?

This gun should be bump-fired only. Do not place the gun on the work and press trigger. Make sure that the safety spring is in place and has good tension. The spring helps to push the foot off the trigger so that it fires once. You could also adjust the screw that pushes on the firing valve. Turn in or out several turns till head of nail is correct when bump firing then lock the nut. The safety foot fits rather loose on the gun and should still work ok but can get so loose that it falls off the nose. Good luck

Jan 23, 2013 | Hitachi Air Tools & Compressors

1 Answer

I have the 2 1/2 Hitachi for nailing siding. The nail gun had not been used for a couple of years, but now will only drive the nail half way in. Sounds like an air leak when driving the nail. I have...

Remove the nails and air supply. With side door open notice position of driver. Driver should be at top position with tip not visible. If driver is down and it moves within cylinder when you tilt nose up then down again, time to replace orings. If driver is down, it should extend past the nose about 1/4 inch (if driver is broken at the tip the end will look rough and nail will not drive in all the way). If driver extends past the nose more than 1/4 inch then lower bumper may be breaking up /cracked. Easy test for proper function. With nails removed and side door open, connect air to gun and dry fire gun against hard rubber or old coiled air-hose (with air connected and trigger depressed, no air should leak from trigger area, if air leaks when trigger is depressed, look for fault at trigger pin). Feeder should move back then forward in quick motion almost matching speed of driver and driver should not creep down between shots. No air should leak from nose of the gun (push nose against hard rubber and depress trigger and hold in this position, driver should stay down with very little or no air leaking out of nose, when you release trigger, driver will return). If air leaks out of nose while holding in this position, replace lower bumper. If a quantity of air leaks from valve in front of trigger, cylinder orings may need replacing or outer part of cylinder has fine scratches (remove scratches with 400 grit paper). Parts are available at Good lucki

Apr 16, 2011 | Nailers Hitachi Nv83a2 3 14" Coil Framing...

1 Answer

Nail gun is miss fireing sometimes might only fire 1 in 4 nails fired

remove all the nails and remove the air hose. BUMP the tool on something and does the driver come down on its own if so it needs new o rings. also take a look at the feed pawl for a broken spring that would prevent it from feeding nails and lastly look at the coil of nails to make sure they pull freely. Let me know if you need more assistance.

Sep 10, 2010 | Hitachi Tools & Hardware - Others

1 Answer

Sparks when shooting a nail

It is common to see sparks. It is metal striking metal. Although, if it sparks alot. It could be a chipped driver blade and the nail would not drive all the way. Does your sink `em?

Aug 15, 2009 | Hitachi NT65MA2 1 1/4 To 2 1/2 Inch 15...

2 Answers

Hitachi Framing Gun Not Firing - Bad Battery?

Does the fan run and the light blink ont he nailer? I have one that I just bought. I put in the wrong type of nails and got one stuck. I had to take the front apart to clear it and now the damm thing wont fire. The green light blinks and the gas cartridge is basically full, even the fan does run after I release the push lever, but no fire???

I wonder if yours is the same as mine did fire for a couple nails first just fine then got jammed...

I will try to charge the battery more.... MAybe like yours it needs a strong charge for the spark...

Sep 28, 2008 | Hitachi NR90GR Cordless Round Head Gas...

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