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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.
You must have broken tip or out of adjustment. Easy to check. Remove nails, and push safety against scrap air hose or rubber to absorb blow and squeeze trigger. Piston will stay in the down position until your release safety (on some models you will need to pull back on feeder sligtly). While piston is down examine the end of the driver for nice squared off tip protruding about 1/4 inch beyond nose. If no tip or looks broken, replace driver. If tip looks complete, adjust for more depth. Good luck
You do not need any special tools to assemble the pusher into the rails, however there is a trick to getting the spring in the proper position. I use a small pair of vice grips and a paper clip to hold the spring in position. The pusher slides into the rails easily. The back part of the pusher slides into the rails first. On the back part of the pusher there is a groove that accepts the spring, spring spool and pin. The pin will be in a vertical position and the spring will have the end tab with hole towards you. As you push this assembly into the rails you will loose sight of the spring end tab. You must hold the spring end tab at the bolt hole while you push in the assembly. This is done by bending the paperclip straight with very small hook on one end. Hook paperclip on spring tab hole and hold paperclip with vicegrip to position spring tab hole at bolt hole and push assembly all the way into rails untill it locks at rear or rails. This procedure can be varried with goal of holding spring tab at bolt hole. While holding tab in position insert rails into nose of gun and bolt rails. Just leave paper clip hook end there or pull out it does not matter. You are done. Good luck
The hissing indicates your O-rings are worn out and need to be replaced. This is not covered by warrenty and is common for all nail guns. Lots of kits are available on Ebay or your local Hitachi service center should stock them.
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.
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