20 Most Recent Hitachi NV75AG Coil Siding - Framing Nailer Questions & Answers

Go to the link below and enter the model number (NV75AG). This will get you to the parts breakdown page that also has a complete diagram of the gun. This will guide you on the repair. Since you don't indicate what the problem is, further guidance is not possible. Feel free to post any additional questions here.


Link: http://www.ereplacementparts.com/hitachi-parts-c-7927.html?gclid=CM-H3Mi_1KMCFZJd5QodaUCSuw

Hitachi NV75AG... | Answered on Aug 25, 2010

You did not described if there is piston movement when you squeeze the trigger or push outlet into the material. If there is piston movement but it is too weak to push the nail, insufficient air supply is first obvious reason.

Eliminate insufficient air pressure or volume supplied to the piece. Air pressure supplied should be between 70psi to 120psi (4.9bar to 8.3bar), air hose should be at least 7mm internal diameter.

If air supply was eliminated, disconnect air supply and check if piston is not locket in one position, you described that you done some maintenance on the machine. I assume therefore that you will know how to check piston for movement, if there is some restrain, you need to find what is causing it and remove obstruction.

As you put gun together, do not forget to lightly oil all assembly surfaces with compressor oil.

This is very good gun and should serve you for many years to come, we use these for last about 8 years rather haevily without any problem (except aprentices...), hope you will have as good service from yours.

Please send note what was the reason, and how did you solved it.

Hitachi NV75AG... | Answered on Aug 13, 2010

I've had that happen before and what I found was one of the Staples or nails had misfired and wedged before leaving the gun. read the manual on how to get to it for that particular model and also it might be a good idea to adjust your pressure accordingly to keep it from happening again. If the force isn't set proper then a nail could Jam , block the mouth and not allow any other nails to exit. It's very easy to do and not that hard to fix once you've done it at least once. Good luck.

Hitachi Tools &... | Answered on Feb 11, 2019

The number one issue is bad fuel - even if you just purchased it, turn the cell over and check the date stamped on the bottom (often stores don't rotate their stock)
If the fan starts when the nose is depressed but there is no spark then I would investigate the spark wire (make sure there are no nicks or cuts that may short to ground) and the ESU (Electronic Spark Unit).

Hitachi Tools &... | Answered on Feb 02, 2019

Have you kept it properly oiled? It might be jammed because it's too dry.

Hitachi Tools &... | Answered on Oct 24, 2018

Sounds like it's overly dry; needs oiling. Or there is something clogging the air lines or the air chamber inside the gun.

Hitachi Tools &... | Answered on Oct 24, 2018

It sounds like you're producing difficulties yourself by attempting to solve this problem rather than seeking at why their can be a difficulty inside very first place https://www.fliptite.com/

Hitachi Tools &... | Answered on Oct 05, 2018

Google (hitachi)(NR65AK)(manual) without parens.

Hitachi Tools &... | Answered on Oct 02, 2018

Check the date code on the bottom of your fuel - it doesn't matter if it feels full or that you just bought it, many stores don't rotate their stock. The #1 issue with these is bad fuel.

Hitachi Tools &... | Answered on May 30, 2018

just wondering if you are putting enough down pressure
on it before you pull the trigger.?

Hitachi Tools &... | Answered on Jan 07, 2018

1. Have you adjusted the air pressure to at least 100 PSI?
2. Have you cleaned and lubricated the gun per manufacturer's instructions?
3. Are you driving nails into hard wood (oak, walnut, etc.)? Some guns are simply not powerful enough to handle extremely hard woods.

Hitachi Tools &... | Answered on Dec 08, 2017

1) Oil it per the operating instructions.
2) Use only high-quality fasteners. I recommend Hitachi or Bostitch, although those from Harbor Freight Tools are largely trouble-free.
3) Make sure nails are properly inserted in the gun.
4) Check to confirm that your gun is receiving adequate air pressure. With that nailer, I'd suggest 95-105 psi.

Hitachi Tools &... | Answered on Dec 02, 2017

Request the diagram from Hitachi.

Hitachi Tools &... | Answered on Nov 13, 2017

This is not a common problem for your nailer. Indicates a small leak in air path from triggering valve to head cap assembly. Assuming that there are no external air leaks, I would clean and lube the cylinder. Try to smooth all the fine scratches that you see on the cylinder where orings make contact. I use very fine sandpaper and turn the cylinder with a drill attachment. (you can be creative with an attachment, like a round piece of wood 2-3 inches in length that fits snugly into the cylinder find center and screw in a 1/4 in diameter screw, cut off head of screw.) Place your homemade attachment onto drill and slip into cylinder, the wood attachment will not damage the cylinder. I use a variable speed drill and turn slowly while I hold a strip of sandpaper against scratched area. Just a light even sanding is all that is needed. If not too scratched just leave as is. Replace oring number 877316 for cylinder plate (outer) and 877327 packing and lube with white grease. You do not have to replace any other orings unless they look damaged. If you replace all the orings, the cylinder will be too tight and my not work at all. Make sure that the three bolts on top of head are tight (no need to remove them, just make sure they are tight). Good luck.

Hitachi Tools &... | Answered on Nov 07, 2017

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