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

1 Answer

The shaft pin on my hitachi nr83A2 strip nailer won't reset, and causes air to leak heavily out of the exhaust. tapping on the cap with the air plugged in doesn't seem to help reset the valve. What else can I do?

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Hitachi Master
  • 1,388 Answers

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 Good luck and post again if you have other questions.

Posted on Jul 10, 2010

Testimonial: "Thanks, bud! Thankfully, with a little more oil and some extra tapping, I was able to reseat the cam. All is well! "


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Hitachi NR83 leaks from trigger

There are actually two trigger areas on this tool. There is the main trigger that uses an aluminum valve housing, plastic valve, a plastic ball, and most importantly a round, rubber seal under the ball. It is not an o-ring and often it gets bad which will cause the leak. Then there is a secondary trigger that the safety activates. Leaking air from there can be from a number of problems. Here is a diagram of your tool which will help you see what I am referring to.

Feb 27, 2012 | Nailers Hitachi Nr83a2 Flush Framing...

1 Answer

Air leaks around trigger when it is squeezed

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

Sep 13, 2011 | Hitachi NR83A2 2" To 3 1/4" Full Head...

1 Answer


you have a problem with a seal on the cylinder or an o ring that has gone bad. I would recommend replacing all of them.

Sep 02, 2011 | Nailers Hitachi Nr83a2 Flush Framing...

1 Answer

How to adjust double shot for Hitachi nail gun

The condition of the driver oring is an indication of wear of all the other orings in the gun. Remove the nails and lightly tap the nose against piece of wood. If the driver drops to bottom of cylinder the oring is worn out and time for oring kit. Hitachi nailers are sensitive and will double fire if placing the foot against work then depressing trigger. Adjust the depth thumb screw several turns either direction then depress trigger and quickly bump gun against work. Good luck with your repair.

May 03, 2011 | Hitachi NR83A2 Framing Nailer Full Head...

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

Jun 05, 2010 | Hitachi NR83A2S Framing Nailer, Full Head,...

1 Answer

Air blowing out exhaust

take a dead blow hammer and plug the air in and gently hit on the cap, you might have to TAP a couple times to seat the cylinder

May 07, 2010 | Hitachi NR83A2 2" To 3 1/4" Full Head...

1 Answer

My hitachi framing nailer blows air out the back constent

If the gun is blowing air out the back cap it needs an overhaul. If you take it to a service center they will be able to supply you with the proper O-Rings or if you pay a little more they will overhaul it for you.

May 05, 2009 | Hitachi NR83A2S Framing Nailer, Full Head,...

1 Answer

Air leak

Several models of hitachi nailers share the same orings and other parts including the check ball under the trigger pin in your gun. Remove the roll pin holding the trigger to release the trigger pin, (plastic with one oring) then remove the valve with a screwdriver. Replace the vinyl check ball and seal. Parts are available at This should fix the problem that you are describing, however use caution and check that the safety if properly adjusted. Enjoy

Dec 06, 2008 | Hitachi NR83A2 2" To 3 1/4" Full Head...

Not finding what you are looking for?
Hitachi NR83A2 2" To 3 1/4" Full Head Framer with Depth of Drive Logo

233 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hitachi Tools & Hardware - Others Experts

John Trevino

Level 3 Expert

1388 Answers


Level 2 Expert

131 Answers


Level 1 Expert

23 Answers

Are you a Hitachi Tool and Hardware - Other Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides