20 Most Recent Hitachi NR83A2 2" To 3 1/4" Full Head Framer with Depth of Drive Questions & Answers

It sounds like your drive pin is jammed in the barrel. Can you see that moving freely? One of the two nails it fired may have lost a piece and is jammed in the barrel between the drive pin and barrel.
If this is the problem, You'll need to take a sturdy "drift pin punch" and hammer to drive the drive pin back down into the nailer. (I use an old drive pin from a discarded nailer as a drift pin punch)
Once the piston and drive pin are free again, the nailer should work fine.

Hitachi NR83A2... | Answered on Dec 04, 2013

You do not need any special tools to assemble the pusher into the rails, however there is a trick to getting the spring in the proper position. I use a small pair of vice grips and a paper clip to hold the spring in position. The pusher slides into the rails easily. The back part of the pusher slides into the rails first. On the back part of the pusher there is a groove that accepts the spring, spring spool and pin. The pin will be in a vertical position and the spring will have the end tab with hole towards you. As you push this assembly into the rails you will loose sight of the spring end tab. You must hold the spring end tab at the bolt hole while you push in the assembly. This is done by bending the paperclip straight with very small hook on one end. Hook paperclip on spring tab hole and hold paperclip with vicegrip to position spring tab hole at bolt hole and push assembly all the way into rails untill it locks at rear or rails. This procedure can be varried with goal of holding spring tab at bolt hole. While holding tab in position insert rails into nose of gun and bolt rails. Just leave paper clip hook end there or pull out it does not matter. You are done. Good luck

Hitachi NR83A2... | Answered on May 13, 2013

There is no oil change, just add a few drops daily.

Hitachi NR83A2... | Answered on May 21, 2012

If you do not have a parts list for your gun, look that the page below for reference:


Reference #66 is the trigger plunger and #67 is the oring seal.

Leak when you press trigger is most likely due to bad or missing oring on the trigger plunger (white plastic pin under trigger). Remove the roll pin (3mm) holding the trigger and remove the plunger. Replace the oring as needed. If you would like to use generic part. Lowes oring #60 sold in the plumbing department (small package of 10 orings about $2) works fine. Good luck

Hitachi NR83A2... | Answered on Sep 13, 2011

NR83 is the stick nailer. There was two versions. The NR83A was for full round head nails and the NR83AA was for the clipped head nails. The coil nailer was the NV83A was the coil nailer. Here are links for the parts diagrams of all 3 so you can see if one of these is what you have.




Hitachi NR83A2... | Answered on Jul 27, 2011

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.

Hitachi NR83A2... | Answered on Jul 16, 2011

Removing jambed driver can be very difficult. I use an old hitachi driver with some metal removed at the tip to drive in the jambed piston. I grind the used driver slighty to allow for the jammed nails to pass the driver i am using for ram otherwise the old driver will jam up also. To protect head and cylinder from damage I remove them and set to side. Place body of gun on soft wood and hammer old driver blade with heavy copper or brass hammer. Good luck

Hitachi NR83A2... | Answered on Feb 15, 2011

One or more of the rubber o-rings inside the gun are worn or broken. Air is leaking out of where it needs to go to push the driver back up. This is a good gun and worth rebuilding. Unfortunately Hitachi doesn't make rebuild kits for their guns, you have to have a breakdown and order each part you need seperately. If you do this, replace all of the o-rings, if one went bad the others are not far behind. If you take it to a repair shop make sure they repalce all the o-rings.

Hitachi NR83A2... | Answered on Oct 28, 2010

You must have broken tip or out of adjustment. Easy to check. Remove nails, and push safety against scrap air hose or rubber to absorb blow and squeeze trigger. Piston will stay in the down position until your release safety (on some models you will need to pull back on feeder sligtly). While piston is down examine the end of the driver for nice squared off tip protruding about 1/4 inch beyond nose. If no tip or looks broken, replace driver. If tip looks complete, adjust for more depth. Good luck

Hitachi NR83A2... | Answered on Sep 07, 2010

I have had this problem myself, the only fix is a rebuild kit which you can pick up pretty cheap on ebay. the kit will consist of a bunch of seals and just pay attention to the way you take it apart and you will have no problems

Hitachi NR83A2... | Answered on Aug 07, 2010

Hitachi nr83 is one of the very few nailers that does not have the firing valve in the head. Instead the cylinder moves within the body of the gun. When the cylinder retracts it rests on the headcap (#877307). If the cylinder gets stuck in the down position, lightly taping on the head will sometimes reset against headcap. If the cylinder orings/contact surfaces are dry/dirty, the retraction spring will not have enough power to reset. Also, if the headcap rubber is cracked or worn the cylinder cannot make a good seal and leak as you describe. Remove the head being carefull not to tear the gasket and examine headcap and replace as necessary. If headcap looks good, pull cylinder and clean all surfaces where orings contact and remove scratches with fine sandpaper (400 grit). Lube orings with silicone paste lube available at Lowes in the plumbing department and/or swiming pool supplies area. Generally, you do not have to replace any orings unless they are broken or badly worn by grit. After you reinstall the cylinder, make sure that it moves up and down (travel is about 1/4"). Piston oring should fit snug enough to hold piston in place without dropping down the cylinder under its own weight. Parts available at www.toolpartsdirect.com Good luck and post again if you have other questions.

Hitachi NR83A2... | Answered on Jul 10, 2010

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