Question about Hitachi NR90GR Cordless Round Head Gas Framing Nailer

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Hitachi nr90gr..... I cleaned the gun and the fired another 500 nails and it suddenly stopped working(the fan) full fuel and battery...took back off and noticed I had pinched the fan wires and they severed. I soldered back.. but nothing works now

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Posted on Jan 02, 2017

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SOURCE: 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...
Russ

Posted on Oct 05, 2008

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  • 23 Answers

SOURCE: My nail gun hitachi nr83a2 only fires a nail half way

the blade assemblies for the A and A2 are the same.

the pison bumper should not be attached to the driver, if the bumper is moving around inside the gun i suggest checking to make sure it was properly seated when the gun was reassembled. if it was, i suggest ordering a new bumper.

a cracked bumper will usually cause a broken driver.

Posted on Nov 17, 2008

  • 1383 Answers

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

  • 131 Answers

SOURCE: Sparks when shooting a nail

Hi,
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?

Posted on Aug 26, 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

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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...
Russ

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