Question about Hitachi VH650 2 1/2" Full Head Fencing Coil Nailer

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Hitachi VH650 nailer throws air, plunger does not return after firing???

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Your air rings in the housing are shot cheap parts labor not bad shop around

Posted on Mar 11, 2009

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I think it is leakin air thru the trigger what would cause that


If air is leaking from the trigger, check vinyl ball and oring on the white plastic firing pin. If air seems to leak from the plunger just in front of the trigger (with air connected and nails removed move plunger with finger and listen for change in sound), remove the head and pull out the cylinder. The outer oring to the plate around the cylinder is bad, however, clean the cylinder and lube with white grease. Good luck

Feb 03, 2013 | Hitachi NV45AB2 Roofing Coil Nailer

2 Answers

Nv45ab won't advance nails


The allen screw/s that you mention are there to plug holes where automatic equipment would normally connect (such as automatic nailing machines) . This is only a plug and should not be driven in too far. I have also seen allen screws installed in the head to repair small crack/s.

Jan 22, 2013 | Hitachi Air Tools & Compressors

1 Answer

I have an older gun can't read any specs the lables are worn off, the guns safety plunger is sticking allowing for free fire of the gun. most of my other guns have a step plunger with the spring r


To find the model number, look on ebay for hitachi framers and hopefully you will find one listed that looks like yours. If no joy, take the gun to your local fastener/nailgun dealer for parts. The dealer most likely has box full of used parts for your gun. I have seen many older nailers with bent safety foot that caused the plunger to stick in the engaged position. Some nailers have the safety return spring incorporated within the trigger plunger /valve area and still others that have the spring hidden under a guard on one side of the nailer (guard part # 883493). Look under the main body of the nailer for an indention where one side of the safety spring fits into (less than 1/2 inch in diameter) ; directly below the indention will be a point on the safety foot to catch the other side of the spring. Good luck

Oct 22, 2012 | Hitachi 3 - 1/2" Full Roundhead Framing...

1 Answer

NRA833AA model. air is leaking out of trigger valve & will not fire. require manual to check operation.


Here is a link to hitachi web site listing for your gun. Look at the bottom of the page for pdf files of parts lists and manual.
http://www.hitachipowertools.com/store_item.php?iID=154&arrPath=1,9,43,p154,

There are two areas around trigger that can leak air. Spray soapy water on trigger stem and/or plunger valve. If leak is at trigger stem check vinyl ball. If leak is at plunger valve, most likely worn or broken oring inside of gun. Remove head and pull outer ring to reveal two orings. A worn outer oring will cause leak at plunger. If orings are ok on outer ring, pull cylinder and check for scratches where orings contact. If scratched, sand with 400 grit paper untill smooth and repack gun with oring kit. Good luck.

Jan 09, 2011 | Hitachi NR83AA3 3 1/4" Clipped Head...

1 Answer

My hitachi nailer is not firing. Sounds as if the


This sounds like the nailer is not in the "home" position. Usually this is due to a leak in the o-ring or a lack of lubrication that is not allowing the plunger to return to the home position. If you can get an O-ring kit, I'd replace all of the orings and make sure that everything is properly lubricated. Should that not fix the problem, the next likely candidate would be the trigger assembly itself. The O-ring kit will run about $20 or so and a similar amount for the trigger assembly.

Hope this helps,

Dan

May 24, 2010 | Hitachi 3 - 1/2" Full Roundhead Framing...

1 Answer

I just rebuilt the nail gun with all new o-rings and gaskets and when I put the air to it air actually blows the rubber boot off the plunger on the trigger assy.


I am assuming that the boot is blown off when your fire the nailer. This is caused by a loose/worn plunger and valve. If the plunger moves from side to side too much air will flow past the valve and blow off the boot. Most used hitachi nailers will blow this boot. Only way to fix is replace one or both parts. If air leaks past the boot immediately when you connect to air, check oring on plunger A (part# 874-820) or outer orings on cylinder guide and cylinder plate. These outer orings are easy cut while inserting these parts into cylinder. Check orings for nicks. Good luck and post again if you have more questions.

Mar 11, 2010 | Hitachi NV45AB2S Coil Roofing Nailer

1 Answer

Have older VH650 need new front piston bumper. Where are parts available


Rona Hardware stores can get parts, or you can contact a local tool supplier, or even Hitachi direct on their web site.

Feb 27, 2010 | Hitachi VH650 2 1/2" Full Head Fencing...

1 Answer

It will double fire sinking second nail only half way. This happens every third or fourth shot. The nailer is a Hitachi NR 83A 3.25in. X .131


the pin pushing your nails is loose and the guides are warned .
try to change the guides and you will see that this problem will will be gone .
one last thing , make sure the coils are in good shape as it may create some feeding problems and push 2 nails at once

Sep 26, 2009 | Hitachi VH650 2 1/2" Full Head Fencing...

1 Answer

Hitachi NR83A air leak


Most all Hitachi nailers that use the plunger style of firing/safety mech will leak air past plunger (part #877-339) when firing, however should not leak when connected to air or resting. If air is leaking past plunger when connnected to air check following:
Remove head to reveal cylinder plate (part#877-318). Remove plate and check outer oring for nicks or broken. If nicked or broken, replace and problem solved. If in good condition, remove cylinder guide (part #877-310) and check two outer orings for nick /cut. Use caution when removing/installing cylinder guide. It is easy to pinch orings when installing causing air leak at plunger. If orings are in good shape then problem is warped body of gun not allowing outer orings to seal. To check for warped body, use the cylinder plate as a guage by lowering it into the area where the cylinder guide rests. Good Luck with your repair.

Mar 12, 2009 | Hitachi NR83A2 2" To 3 1/4" Full Head...

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