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My hitachi nr83a nailer cycles one time when the air is attached. After the initial cyle the nailer operates normally.How do I repair it?

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This is not a common problem for your nailer. Indicates a small leak in air path from triggering valve to head cap assembly. Assuming that there are no external air leaks, I would clean and lube the cylinder. Try to smooth all the fine scratches that you see on the cylinder where orings make contact. I use very fine sandpaper and turn the cylinder with a drill attachment. (you can be creative with an attachment, like a round piece of wood 2-3 inches in length that fits snugly into the cylinder find center and screw in a 1/4 in diameter screw, cut off head of screw.) Place your homemade attachment onto drill and slip into cylinder, the wood attachment will not damage the cylinder. I use a variable speed drill and turn slowly while I hold a strip of sandpaper against scratched area. Just a light even sanding is all that is needed. If not too scratched just leave as is. Replace oring number 877316 for cylinder plate (outer) and 877327 packing and lube with white grease. You do not have to replace any other orings unless they look damaged. If you replace all the orings, the cylinder will be too tight and my not work at all. Make sure that the three bolts on top of head are tight (no need to remove them, just make sure they are tight). Good luck.

Posted on Nov 07, 2017


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Posted on Jan 02, 2017

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SOURCE: i own a hitachi nr90ac3 framing nailer and i

Oil leaking out of the nailer anywhere is just an indication that too much oil is being introduced. A good solution would be to reduce the amount of drops until no more leaks out or use an in line oiler at the gun. An oiler costs under ten dollars and feeds in oil vapor as you use air. Store / hang your nailer with the air inlet down at night to drain out access oil. Do not worry too much about the leaking though, I think that a bit too much oil is better than a lack of oil. Good luck.

Posted on Apr 10, 2009

  • 2176 Answers

SOURCE: looking for a manual for an Hitachi Framing nailer

Go to and type in your model number and you can download a manual for this tool

Posted on Oct 27, 2009

  • 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

  • 59 Answers

SOURCE: air leak

My Guess is that it needs a new "O " ring or some other form of seal some where round the trigger actuating spindle. Should be quite easy to fit if you can get one the right size

Posted on Jun 06, 2010

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Hitachi nr83a leaks air at new g.asket between head cap and body. screws are tight

If its constant leaking inside the nailer (not between cap and body to outside feeling an airstream in front or on one side )then there is an problem between top seals VALVE and seals o-rings on top of the piston cilinder the parts on the top of the cilinder Seals and in the top in high priority must all be replaced because of the building up heat overtime the gaskets seals and o-rings are getting hot and hardened out over time there are only separate parts selled one by one to get I have not seen hitachi gasket/o-ring kits for nailers there where only complete kits for the older range of demolition hammers , but in the new models not anymore outside the States m,aybe but in Europe not. replacing the piston bumper could sometimes help extra because of the little height difference of the cillinder .

If leaking between cap and body with a palpable airstream and before the seal was closed tight , retapping the treaths some greater in the magnesium body and place helicoils inside it could be bad treath in one of them , it must put firmly fixed that will not fasten enough that was with the Brand Dutack Pro a high priority problem for a few years ago exact the same a few years now its modificated and that problem is gone.
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1 Answer

How to replace a cylinder ring in a hitachi nr83a

If you are going to replace the cylinder ring I would recommend getting the service kit (Part #18000) and replacing all the o-rings.
I'm assuming you have already taken it apart this far but if not:
Remove the 4 hex bolts on the cap and remove the head.
Using 2 of the bolts - thread them into the inserts on the top cylinder ring and use them to twist it off.
The cylinder and piston should 'pop' up under spring pressure from below.
Using an o-ring pick, remove the o-rings and thoroughly clean the tool - replace the o-rings and the bad cylinder ring. Lubricate the new rings with the grease provided and reassemble.

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My framing nailer is old . Can I still get parts ? # on gun is C315813D

Factory and aftermarket parts are available. Check model number NR83a. Order from Good luck

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Air is pouring out of the head of my NR83a Hitachi nailgun

It appears that there is a small o ring that has missed you attention in reassembly and has fallen out of the groove. re do the job paying to gaskets and o rings.

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My hitach nr83a just blows air out the exhaust when pluged in and wont shoot. is this a trigger or exhaust problem ???

Your problem is most likely where the cylinder / head come together. In the Hitachi framers, the cylinder is designed to move up and down (unlike Bostitch where the head valve moves) so if the O-rings are dirty or broken, or the spring under the cylinder is broken - the cylinder won't make a good seal to the head valve.
You can try plugging the tool in and giving a couple of firm taps straight down on the head with a rubber mallet - if the leak stops or slows you'll know the problem is with the cylinder movement.
Check the head valve seal - often they get sand / debris embedded in them which prevents the cylinder from making a good seal.
It is rare for a Hitachi trigger to be a problem.

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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.

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1 Answer

Air leak

My Guess is that it needs a new "O " ring or some other form of seal some where round the trigger actuating spindle. Should be quite easy to fit if you can get one the right size

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Looking for a manual for an Hitachi Framing nailer

Go to and type in your model number and you can download a manual for this tool

Oct 27, 2009 | Hitachi Air Tools & Compressors

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