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I want to buy a head rebuild kit, for Hitachi coil nailer NV45AB2

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  • Hitachi Master
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I buy most of my parts from www.toolpartsdirect.com. The headvalve is the only part that wears in the head. It will leak when the rubber/vinyl seat material begins to crack(new models use rubber). If the head valve looks ok with no cracks then no problem in head. If you are having problems with the gun please post again describing issue. Good luck

Posted on Oct 16, 2010

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1 Answer

Air slow to build pressure after the trigger is pulled not sinking nails completely


Tear the tool down and install #18001 Rebuild kit. Just because the O-rings look good doesn't mean they are not worn.
Also make sure you grease the orings with the grease provided in the kit.
The entire cylinder has to move up and down in this gun so it is important it is clean & lubricated.

Mar 06, 2015 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

How do i set the depth on a nv45ab2 hitachi coil nailer


Your owner's manual is available at: http://www.hitachipowertools.com/PDF/All/NV45AB2_NV45AB2S_OM_NEW.pdf
The adjuster knob to set the depth the nail is driven to is on the same side of the gun you load the nail on, just at the bottom of the head and near where the head of the next nail to fire rests. Pull down on and turn the knob counter-clockwise to leave the nail higher in your work or clockwise to drive them in deeper. When you let go of the knob it will spring back up. With it up turn it until it locks into place, usually another 1/4 turn or less.

Dec 16, 2011 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

Need manual for Hitachi NV45AB2 coil nailer


go to "hitachipowertools.com" and you can download the manual you are looking for. Let me know if you have trouble or need more assistance.

May 06, 2011 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

Hi, when I nail also it leak. when I make a shot, the gun nailer blow for the middle. but when I don't nail it does'nt feel any leak.


Your description makes it clear that it needs a head rebuild kit. You can order this from Hitachi, or send it in to local Hitachi center. Good machine, straightforward repair. If you are a little handy, you can do this repair yourself. remember to oil the gun frequently to make your repair last longest. Farmerbear at FixYa

Oct 14, 2010 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

Nails dont always feed 1 out of 2


could be feed pawl problems e.g. broken spring, restricted movement or the piston is not retracting fully, either way I would probably try and rebuild (new o rings, thorough cleaning) this tool. You can buy a replacement o ring kit from Nailgundepot.com you will need to give them your model number for this kit. Let me know if you need more help.

Dec 27, 2009 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

NV45AB2 worked great a year ago.hooked it up last week and it only shoots the nail 1/4 inch in a piece of wood and it wont advance the next nail.My framing nailer works so the hose presure is good.


if you havent used in a year the o rings could be dry and you can try and lubricate them, but sounds like it needs them replaced. You can try going to Nailgundepot.com and buying an o ring rebuild kit from them. It contains all the needed parts except for the grease to lube the o rings. Let me know if you need more help

Dec 23, 2009 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

Only shooting one nail. The punch wont retract after the first shot. Do i need to replace the seals?


I would suggest going to Hitachipowertools.com and downloading a schematic for this tool and buying a rebuild kit for it. Also check the spring on the advancing pawl to make sure not broken. You would have to thoroughly clean this tool if it is a roofing nailer.Let me know if you need more help.

Dec 21, 2009 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

Year of Manfacture for Hitachi NV45AB2 Coil Nailer Serial Number 341889.. Thanks, Marty


on hitachi air nailers the first number is the month and the second is the year , the only confusion might be if the nailer is older than ten yrs( the nv45ab2 has only been out about 4 yrs) so your roofer was made in march of 04

Nov 20, 2009 | Hitachi NV45AB2 Roofing Coil Nailer

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