20 Most Recent Hitachi NR90AE Full Round Head Framing Nailer Questions & Answers

Just as a matter if interest, were you using the tool in soft or hardwood? This is something that only happens if repeatedly used in an extremely hardwood like Ekke or similar. Did Hitachi resolve the problem with you? Regards Alex

The piston is broken if it came out. Remove the 4 bolts on the head, remove head and you will see the piston - be careful removing it because it is easy to score the cylinder walls if it is cockeyed. Replace the driver, lubricate the O-ring before inserting

Should take up to a 3 1/4 in. nail

use the lube that came with the kit, you can replace everything correctly but if oring gets pinched it will still leak

New user will jam the gun/ nails because gun was most likely not bump fired. Placing the gun then depressing trigger will usually cause double fire in the hands of new user. New user should practice on scrap lumber bump firing at many angles till they get the idea; or give them a training period with a nailer that has a single shot trigger (they may develop bad habits with single shot however).

I have the same nailer and I got a nail jammed in it when I hit a piece of metal.

I had to take the magazine off then remove the safety. This can be done with a hex key and a small wrench. Onece I had access to the nail head I banged it out with a hammer and small punch. It all depends on how and where its jammed, hopefully you don't have to take it apart and can just pull it out with pliars.

Oil leaking out of the nailer anywhere is just an indication that too much oil is being introduced. A good solution would be to reduce the amount of drops until no more leaks out or use an in line oiler at the gun. An oiler costs under ten dollars and feeds in oil vapor as you use air. Store / hang your nailer with the air inlet down at night to drain out access oil. Do not worry too much about the leaking though, I think that a bit too much oil is better than a lack of oil. Good luck.

Have you disconnected it from the air source and deep cleaned the nail gun? Sometimes even a tiny bit of dirt can block the rails the rod runs in. Once cleaned add a small amount of oil to the rod runners.

Test the volts and amps of the battery after charging, then try to shoot nails then test again after the blinking orange light. Battery is failing, they only have a certain number of recharge cycles and are also governed by age degradation. https://www.google.com/search?q=hitachi+nailer+battery+problems+and+solutions ..

It is possible that the oil you added to your Hitachi pin nailer isn't the correct type or that it has not been added in the correct amount. You should refer to the manual that came with the pin nailer to determine the correct oil type and the proper amount to use. If this does not resolve the issue, you may need to take your pin nailer to a technician for repair.

oil it --few drops especially in ram