Hitachi Tools & Hardware - Others - Page 4 - Recent Questions, Troubleshooting & Support

I have a older Hitachi 3 1/2 full roundhead nailer and on my there is a button on the front below the head at the end of the nails that you push sideways and hold and slide the nail gun tip up or down. There should be grooves across the front of the tip.

could be in need of an internal adjustment to stop the hammer from hitting the end plate ( travelling to far) talk with a tool repair shop and see if there is something that can be done contact a a hitachi service agent for advice go google and type in--- repair manual for Hitachi nail gun-- and see if there is a manual in pdf version that you can download

If it's new, return it. on warrant. If used, ask where you bought it, maybe they have some experience

oil it

lube the nails

Should be a little roller on or near point where nails come out. Roll right for deeper or left for less

There's a tiny set screw holding it on.

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.

If you are going to replace the cylinder ring I would recommend getting the service kit (Part #18000) and replacing all the o-rings. I'm assuming you have already taken it apart this far but if not: Remove the 4 hex bolts on the cap and remove the head. Using 2 of the bolts - thread them into the inserts on the top cylinder ring and use them to twist it off. The cylinder and piston should 'pop' up under spring pressure from below. Using an o-ring pick, remove the o-rings and thoroughly clean the tool - replace the o-rings and the bad cylinder ring. Lubricate the new rings with the grease provided and reassemble. Hitachi NR83A 3 1 4 34 Full Head Nailer Parts

Could be bad gas canister or needs cleaning. How many boxes of nails You shot thru that tool?

Did You drop it? AirNailerParts Nailer Parts

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.