Question about Hitachi NR83A2 2" To 3 1/4" Full Head Framer with Depth of Drive

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Ive had this gun for a while but recently i tried to use it and it wasnt nailing right. just a little bit of air comes out when i press the trigger and im not sure what it could be.

Posted by r_martin_hdz on

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Brad

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  • 425 Answers

Remove the 4 screws and the head assembly. On this model the head valve is fixed but the cylinder moves and is spring loaded. Make sure that the cylinder moves slightly up and down freely.You may need to install a new o-ring kit if the old ones are worn or dried out.

Posted on Jul 16, 2011

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I have a FR350A framing nailer. I rebuilt the entire gun including the trigger valve. But the new valve leaks air when I try to fire a nail. I bought another valve but the second valve leaks air also.

The trigger valve should release air when depressed. This release of air comes from behind the head valve. If the head valve does not pup-up when the trigger is depressed then air is leaking past the head valve orings. Try coating the head valve orings with plenty of white grease and retest. If the gun fires you know that orings are leaking. Test with no more than 100 psi. Good luck with your repair.
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I presume the gun fires but no nail is ejected. A possibility is jammed nails in the magazine. Do you see a mark in your work piece of the driver blade? If yes then it is most likely jammed nails. If not could be a broken driver blade. If gun does not fire could be gas problem. (check in date, yes it does have a use by date), another cause of not firing is a broken wire particularly around trigger switch (switch is on trigger and hence the wires are flexing every time trigger is pressed). Another cause of not firing is a brass spring clip in handle assy if this breaks it stops the gun firing. Recently I have had more broken wires than anything else on these guns. Worth noting is that the Stanley Bostitch nail guns suffer the very same faults. Also note they are the same gun just different colours so you can fit Hitachi parts to the Bostitch and they are cheaper.
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When you hook the air hose to the gun it fills a cylinder with air pressure.
When you pull the trigger. the cylinder pressure is released onto a firing pin that shoots the nail.
The air pressure line is also connected to the trigger and therefore the trigger has to be sealed.

When ever using a nail gun, you add a bit of gun oil in the back of the gun (not 3-in-1motor oil, it has to be non-detergent gun oil)

If you haven't used the gun in a while, it is best to oil up the gun and let the oil run down into the gun.
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Back when I was in construction, there were several nail gun shops that sold and serviced nail guns, and sold nails to the contractors. I don't know if that business model is still active or if you have to send the guns to Bostich service center.
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