Question about Hitachi NR90GR Cordless Round Head Gas Framing Nailer

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Hitachi Framing Gun Not Firing - Bad Battery?

Hitachi Franing Gun Not Firing.

I have a NR90GR Hitachi Framing Gun and it appears that the battery might be defective. I charge the battery every night and the nailer works for about 10 minutes and then the gun stops nailing. What might I being doing incorrectly?


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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...

Posted on Oct 05, 2008

  • Russ Bustman Aug 03, 2009

    Ended up realizing a couple things were wrong with mine. When I took it apart to clear the jam after the third nail did not fire properly, I must have not put it together perfectly as the little tab which moves a switch was not set right and that was causing mine not to fire. After this was repaired it fired twice more and then the fan quit. I took the fan motor out and it runs perfectly when connected to the battery. The little wires connecting to the fan show 8.o volts on the multimeter until I connect eh fan and then it drops to 0.. So it seems the problem is the curcuit board not allowing enough current for the fan now? Wow what a lot of issues and I spent over $400 and now still do not have a nailer that works? Any help or suggestions? Does anyone want a guns which is new except the $100 curcuit board is not working?



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I think you have solved your own problem. Sounds like the battery to me as well.

Posted on Sep 28, 2008

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SOURCE: Can I use paslode roundrive nails in a Hitachi NR90GC Gas Nailer

Yes, BUT the paslode Round drive nails and known to cause driver jamms due to the excessive paper used in the spacing of the nails.

Posted on Oct 31, 2009

  • 885 Answers

SOURCE: hitachi nail gun,piston/nail push rod

You have one or more worn o-rings in the head of the gun. They direct the air to the proper parts of the gun to first drive the nail then to return the driver to the top of the gun for the next nail. Depending on the manufacturer and your model number, some companies make kits to replace the o-rings (always replace all of them). For some companies you have to get a breakdown of the gun and order each o-ring seperately.

Posted on Oct 25, 2010

  • 304 Answers

SOURCE: my hitachi nail gun NR90gc2 will not fire

Check the date of the bottom of the gas. With the gas removed when you fire it you should hear a faint spark sound from the top. If gas is in date try putting it in your pocket for 10 minutes to warm it up. Open the front and make sure the piston is pushed all the way up into the machine.

Posted on Nov 22, 2012

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1 Answer

The fan runs constantly when the battery is inserted why?

There is a small micro-switch that provides one of the two necessary firing inputs to the control circuitry which is likely to be faulty. When you push the nail gun into the timber it pushes this switch and runs the fan which mixes the gas for ignition. Then you normally press the trigger activating another micro-switch for the control input to fire the spark.
At a guess without viewing the gun you'll need to. replace this and you'll be good to go.

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Suggest you get it checked out at a repair centre.

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New user will jam the gun/ nails because gun was most likely not bump fired. Placing the gun then depressing trigger will usually cause double fire in the hands of new user. New user should practice on scrap lumber bump firing at many angles till they get the idea; or give them a training period with a nailer that has a single shot trigger (they may develop bad habits with single shot however).

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Can I use paslode nails

probably as long as they are the same nail BUT nailers are often very finnicky, probably by design, to encourage users to buy brand nails. would recommend NOT mixing brands with nailers and nails, from personal experience.

Dec 04, 2009 | Hitachi NR90GR Cordless Round Head Gas...

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Start with the basics:
First check that the butane (or whatever gas is used) canister is full. If empty, put in a new one.

Second check to make sure your battery is fully charged to be able to fire the spark to work the nail gun. If not get the battery charged and/or replaced as needed.

Third make sure all of the safeties are working properly and that you have them engaged to the piece of wood you are nailing when you try the trigger.

If beyond that it does not work it could be a bad trigger, a bad safety switch, or even a bad connection from the battery to the device.

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Hi .I had the same problem with my gun,have you tried taking the fan housing off and cleaning the sparking point then oil and reassemble this seemed to wok on mine

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Were can i buy new one

The link below will take you to (toolpartsdirect). This is where I purchase all my parts. They are quite handy because they sell most all popular brands/parts. Good Luck with your repair.

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