Question about Hitachi NV45AB2 Roofing Coil Nailer

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My nailer is shooting the head of the nail and stumbling especially if not in perfect vertical position(tip at north and air fitting south) even then it still skips and nailhead first with the odd nail just falling out.

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

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Posted on Jan 02, 2017

  • 125 Answers

SOURCE: won't feed nail

This happens to my gun too. You probably need to oil the gun once in a while. Here is how you fix it:
Disconnect the gun from the compressor first don't wanna get hurt or anything like that. There is a pin that shoots the nail out well that pin is jammed so what you have to do is push that pin to the original position. using a flat head screwdriver would help you to push that pin back into place. Let me know how that turns out please. I pretty sure that is the problem with your gun. Make sure you lubricate the Nailer once in a while.

Posted on Oct 02, 2008

  • 1388 Answers

SOURCE: 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

Posted on Dec 07, 2008

  • 79 Answers

SOURCE: air leaks not the problem

sounds like the piston or the head valve is stuck. Open up the back with an allen wrench. Look it over really well. Clean it out with some WD40 after you pop out the head valve and take out the piston and cylinder. You're probably gonna need a kit with seals and o-rings. There is also a bumper (towards the front of the gun that seats inside the cylinder, make sure everything looks good and not dry-rotted or dirty. Lemme know. Please rate me

Posted on Jun 18, 2009

  • 2176 Answers

SOURCE: NV45AB2 worked great a year ago.hooked it up last

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 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

Posted on Dec 23, 2009

Testimonial: "Thanks for the reply and the items to check Rowdy45176,It is an older gun i bought used."

  • 382 Answers

SOURCE: Hitachi NR83A2 nailer pushes next nail down

Are you using full round head nails?

The hissing indicates your O-rings are worn out and need to be replaced. This is not covered by warrenty and is common for all nail guns. Lots of kits are available on Ebay or your local Hitachi service center should stock them.

Hope this helps,


Posted on Jan 22, 2010

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This happens to my gun too. You probably need to oil the gun once in a while. Here is how you fix it:
Disconnect the gun from the compressor first don't wanna get hurt or anything like that. There is a pin that shoots the nail out well that pin is jammed so what you have to do is push that pin to the original position. using a flat head screwdriver would help you to push that pin back into place. Let me know how that turns out please. I pretty sure that is the problem with your gun. Make sure you lubricate the Nailer once in a while.

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