How to install Hitachi NR83A framing nailer, feeder spring

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

maybe its your connection thats leaking and not the nailer.

Factory and aftermarket parts are available. Check model number NR83a. Order from www.toolpartsdirect.com. Good luck

NV50 nailer is very difficult to repair due to complicated feeder /feeder spring / feeder retainer pin design. You most likely need to replace the orings on the feeder piston. Problem is that you must remove the feed pin/ spring to get the piston out. If you are going to attempt to replace the orings, study how the pin is installed otherwise you will make it worse. Order new springs (2 different springs ) and install them when you are going back together. Good luck

You can use an oring in place of the feed spring until you get the factory spring. If no supply for orings, use several of the rubber bands that come on the coil nails. Remove the broken spring and streach oring between one side of the retainer pin and the other. If the oring is snugg enough, it will have same spring action on the feeder as torsion spring. Have several torsion springs in stock for future use. Also check the condition of the retainer pin. If the pin shows signs of wear, replace it because a loose pin will allow the feeder to move around too much.

NR83 is the stick nailer. There was two versions. The NR83A was for full round head nails and the NR83AA was for the clipped head nails. The coil nailer was the NV83A was the coil nailer. Here are links for the parts diagrams of all 3 so you can see if one of these is what you have.

http://www.toolpartsdirect.com/cgi-bin/schematic.cgi/hitachi/NR83A

http://www.toolpartsdirect.com/cgi-bin/schematic.cgi/hitachi/NR83AA

http://www.toolpartsdirect.com/cgi-bin/schematic.cgi/hitachi/NV83A

Often a trigger leak in the NR83A is caused by a bad gasket in the head #877-327. If this is improperly installed, cracked, or overcompressed it will cause the trigger to leak.
It is uncommon for the trigger itself to be the problem.

My Guess is that it needs a new "O " ring or some other form of seal some where round the trigger actuating spindle. Should be quite easy to fit if you can get one the right size

Go to Hitachipowertools.com and type in your model number and you can download a manual for this tool

The reason that you are having trouble re-assembling the ribbon spring is that you need three hands to complete the job. As you recall the nail pusher just slips into the front of the rails. The pusher has the spring and a pin to retain the spool in place. Install the spring with the bolt hole towards leaver and slip into the front of rails. Take a small paper clip and bend a small hook to catch the ribbon spring. Hook the springs bolt hole with the paper clip and hold the spring in the approximate position for bolt as you push the assembly into rails and use latch to hold. While holding spring with paperclip, insert bolt thru rails and spring into nosepiece. Just break off the paperclip at this point and you are almost done. Some nailers have a metal support clip that you would need to have in place on bolt before installing bolt thru spring. For a breakdown of the gun go to www.toolpartsdirect.com. The other bolt for rails has a support/guide for the safety foot. Good luck and email if you have questions.