Question about Hitachi NV45AB2S Coil Roofing Nailer

1 Answer

Rebuilt nail gun and now it just blows air out the exhaust port

I have a hitachi nv45ab that was in desperate need of new o rings. I bought the kit and a service manual and followed step by step replacing every o ring in the gun. Now when I plug in the air line the gun just blows air out of the exhaust port. Its not a small leak it just blows all the air right through the exhaust. I have taken the gun back apart 3 times now and still come up with the same result. I do have one o ring left over from the kit its numbered 9 in the service manual valve o ring. It is supposed t sit on the head cap but there was no o ring there when I took it apart. I have tried to put the o ring in but do not see where it would go. And every place I have tried does not make a difference. I have another working gun but I am affraid to take it apart to look if it has the o ring in it. I dont want to have two guns that dont work. Please help.
-Alan

Posted by on

  • firemane82 Apr 23, 2009

    Thank you so much for the quick response. The gun works like its brand new again. I cant believe it was that simple.
    -Alan


×

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Contributor
  • 25 Answers

This probably is the problem,

The cylinder that the piston moves up and down inside is probably to low, and not making contact with the rubber piece in the head cap.

The cylinder has a spring that allows for movement up and down, take a pliers and gently pull up the cylinder if it does not move freely on its own. It will stop when it reaches the cylinder plate ( the part with 2 screw holes for easy removal). Be careful not to mar the cylinder though.

When reassembling the cylinder should make contact with the head cap. Hope that works!


Posted on Apr 23, 2009

Ad

2 Suggested Answers

6ya6ya
  • 2 Answers

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

Hi,
a 6ya expert can help you resolve that 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.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
  • 1244 Answers

SOURCE: Hitachi NV45AB coil nail gun is leaking air from

the top!! o-ring inside of thr top plate is bad you need to remove the plate /dissasemble and replace the o-ring

Posted on Jan 21, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Why does my Hitachi nv45ab gun double fire nails?


This gun should be bump-fired only. Do not place the gun on the work and press trigger. Make sure that the safety spring is in place and has good tension. The spring helps to push the foot off the trigger so that it fires once. You could also adjust the screw that pushes on the firing valve. Turn in or out several turns till head of nail is correct when bump firing then lock the nut. The safety foot fits rather loose on the gun and should still work ok but can get so loose that it falls off the nose. Good luck

Jan 23, 2013 | Hitachi Air Tools & Compressors

1 Answer

Why won't feed plunger advance nails?


The two hex head screws on the very top of the head hold the air deflector and attach to the headvalve (the part inside the head with rubber coating, this headvalve has a gasket under that should be check for proper alignment ). Other small screws that look like set screw are only plugs that are removed to install auto control hoses in factory work. These are only plugs so just put them in a few turns with locktite.

Jan 23, 2013 | Hitachi Tools & Hardware - Others

1 Answer

Hitachi NV45AB won't advance nails


This problem could be caused by the head gasket fliped the wrong way not sealing small hole in the body. Also the head valve gasket (small round gasket between headvalve and head) could be place with vent hole mis-aligned. Check these two items and post again.

Jan 22, 2013 | Air Tools & Compressors

1 Answer

I have a N80SB stick nail gun that have been leaking air from the trigger valve but was still able to shoot nails. After 3 months of discontinued use, I plugged in the air hose and fire the first nail


A new trigger valve and o-ring kit will give you a like new gun. Just remember to replace all available o-rings in the kit, lightly grease all of them as you reassemble the gun and use pneumatic oil at the beginning of the day so you won't be doing it again in a couple months.

Feb 23, 2012 | Stanley Bostitch Stick Framing Nailer...

1 Answer

I have N80 coil nailer not exact sure on what exact nail gun it is considered but it is leaking air out exhaust ports as soon as you hook air up to it and cylinder moves slow into the drive position like...


you are correct, also you want to look at the cylinder ring and also the bumpers. These tools are not that hard to rebuild. Make sure that you light grease all the o-rings before reassembly. If the bumpers (under the cylinder) are destroyed you would also need to remove any small fragments from the air tube that goes to the feed piston. Let me know if you need more assistance.

Oct 28, 2011 | Stanley Bostitch Nail Gun

1 Answer

AIR BLOWING OUT OF EXHAUST PORT DO NOT NAIL AT ALL


you have a problem with a split o ring or a seal that has gone bad. I would suggest buying a rebuild kit and redoing all the internal parts. It is not that hard to do and I would suggest taking some pics along the disassembly to make it easier when rebuilding. Let me know if you need more help.

Jul 09, 2011 | Stanley Bostitch Nail Gun

1 Answer

Hitachi nail gun,piston/nail push rod wont retract after pushing nail (stays protruding out of gun so the remaining nails stay underneath it


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.

Oct 25, 2010 | Hitachi Tools & Hardware - Others

2 Answers

Hitachi NV45AB coil nail gun is leaking air from top of gun


the top!! o-ring inside of thr top plate is bad you need to remove the plate /dissasemble and replace the o-ring

Jan 21, 2010 | Hitachi NV45AB2 Roofing Coil Nailer

2 Answers

Hitachi nail gun nr90ad leaks from trigger when air hose is connected


Orings, they have to be replaced every few years. Warranty does not cover them.

Any Hitachi service centre should stock them. Or find your model on Ebay:

http://shop.ebay.com/i.html?_nkw=hitachi+o-ring+kit&LH_IncludeSIF=1&_arm=1&_armi=0&_armm=20&_ruu=http://shop.ebay.com/i.html%3F_nkw%3Dhitachi%2Bo-ring%2Bkit%26_arr%3D1&_rdc=1

Hope this helps!

Thanks

Jan 20, 2010 | Hitachi Air Tools & Compressors

Not finding what you are looking for?
Hitachi NV45AB2S Coil Roofing Nailer Logo

2,208 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hitachi Tools & Hardware - Others Experts

John Trevino

Level 3 Expert

1388 Answers

yoopertech

Level 2 Expert

131 Answers

Joe Garcia
Joe Garcia

Level 2 Expert

205 Answers

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

Answer questions

Manuals & User Guides

Loading...