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HomeOff Topics › Help with Hitachi NR90AE(S) Strip Nailer
07-25-2017 12:18 PM  10 months agoPost 1
sjgusmc21

rrApprentice

San Antonio, Texas

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I purchased this nailer re-manufactured off of Ebay and it worked great for the first 500 or so nails, until I hit a knot. It started leaking air from the top and the nose, then would only half drive a nail. I proceeded to tear it down, and solved the top air leak and the nose air leak, but it was leaking profusely from the trigger area and would not fire.

I have replaced every gasket on it, and the three plastic piston parts to the trigger. Tonight, when I tested it, no air leaking until I pulled the trigger and air leaked from the side the trigger housing.

I do not believe I have any bad gaskets, and like i said, I replaced the plastic piston parts of the plunger assembly. It has to be something simple, I just don't know what it is. I do not believe any parts are missing. I have gone over, and over the diagrams and just don't see any parts that I haven't used, missing.

Any suggestions? I have attached a picture of the diagrams with the parts I have replaced in red. I am trying not to take it to a shop, as I am sure it is probably something I am doing wrong. Maybe a pinched gasket when I put it back together? I just don't know. Any help would be greatly appreciated.

http://www.ereplacementparts.com/hi...310_147615.html

The url is the diagram to the nailer I have.

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07-26-2017 12:45 AM  10 months agoPost 2
Pistol Pete

rrProfessor

Seffner, FL

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Maybe a pinched gasket when I put it back together?
Hate to ask but did you grease them before installation? Lithium grease or the air tool oil itself.

Most air tools failure are due to lack of lubrication which is a must before and during its use.

~~Enjoying the hobby one flight at a time~~

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07-26-2017 03:56 AM  10 months agoPost 3
sjgusmc21

rrApprentice

San Antonio, Texas

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Pistol Pete, you are correct and though I 'greased' them, I don't think I did enough. I redid them tonight, and will test tomorrow. Thank you! I think grease also helps to keep them from pinching as well.

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