This video will teach you to remove the piston and driver assembly from a nail gun, allowing you to replace a broken driver or access other parts that may be reducing your nail gun's performance.
Discussion for the Hitachi NR83A 3-1/4" Full Head Nailer
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Question: Hitachi NR83A
I have an old school 3-1/4” framing nailer that is over 20 years old. The driver drives the nail only once and The driver doesnot retract. I have to remove the nails in cartridge, then manually push the driver back into position. What part or parts is causing this, & is there a piston rebuild kit?
You will need to remove the top of the gun, To see what parts are worn or broken. Such as o-rings, seals, piston bump etc. There is an o-ring kit available but no driver/piston kit
Question: Leaking Air Out The Exhaust
I removed the exhaust cover for an older 1984 Hitachi nr 83a to inspect the head cap and found a thin metal circular clip imbedded in the edge of the head cap (approx. 3/8 diam. and 1/8 high). Not sure were this came from in the nail gun. I am unable to find this part in the diagram. Any help is appreciated to make sure I don't miss replacing any necessary parts.
Question: Nail Depth Issue
i have an older Nr83a . i have replaced all the seals, just recently replaced the driver . and i can not get it to properly sink the nails . trigger dosent leak. the gun is running off an emglo airmate at 120 psi. using a 3/8 line and connector .
Check for excessive grooving of the cylinder wall.
Question: Remote Firing Valve
what is a remote firing valve
Question: Air Leak
I have a major air leak around the trigger. When I hold the tigger in the air leak stops and the gun will bump nail. When I release the trigger the air leaks and the gun will not build pressure. I change the two o-ring in the trigger area and clean the ball. Any help?
There a quite a few parts involved with the trigger. Check them all for wear. Hopefully it will be one of those parts.
Replace all the trigger parts as wear in this area is accumulative and you will drive yourself nuts guessing at what part is causing the problem. Even if you do find the part causing the problem you will have future problem in this area if all are not replaced together.Hope this helps.Good luck.
The urethane ball sits in a packing, or seal. It's probably deteriorated.
I took apart my NR83A and replaced all O rings and most gaskets. Including trigger o-rings. Put everything back together and I have massive air leakage from exhaust draining my compressor pressure. Any ideas?
Hi dijz1: Did you replace O-Ring (S-90) Part Number: 877-316? This is the bulkhead O-ring where a lot of leaks are from.Also does the tool shoot ok other then the air leak?Knowing this will help us troubleshoot the tool better for you.
The cylinder on the Hitachi move up and down to fire. Most likely you need to turn the gun upside down and "whack" the top of the gun on a piece of wood to cause the cylinder to seal to the head valve. If that does not work you will need to replace the head valve (877-307).
Question: Rebuilding Hitachi Nr83aa- Rippe...
I have to replace the cylinder ring on this nail gun, but since it was ripped i'm not sure where it goes on the cylinder. I think it goes over where the small holes are?
Hi, Yes it goes over the holes and is a cylinder check valve for return air. Nail guns use low pressure to pull the piston driver assembly back up to the top of the cylinder and this check valve helps it do that. Hope this helps.
Question: Hitachi NR83A Framing Nailer - P...
The piston driver on my tool does not retract like it should when bump firing the tool. It hangs up until I release the trigger, then retracts as norma. It acts like a sequential fire tool. Something weird in the exhaust system? Any ideas? I just cleaned the tool and replaced all rings and packings. Thanks, Mike.
[QUOTE=americantoolman;5093]The piston driver on my tool does not retract like it should when bump firing the tool. While holding the trigger and pressing to wood it fires but hangs up on return. If I fire like a sequential fire tool pulling the trigger each time it fires and retracts like normal.
I just cleaned the tool and replaced all o rings and packings. Changed out cylinder seal and rechecked trigger parts. Now I'm begining to swap out parts - process of elimination. Anybody seen this before? Any ideas? Thanks, Mike." Thanks, mike.
I am stumped with your problem as well. I can't figure why the gun would fire OK sequentially but not while bumping. Many issues with nail gun pistons not returning are caused by the trigger valve. You might want to check there for bad o-rings or maybe debris from worn part elsewhere in the gun.
Sorry I can't be more help. Let us know how it turns out.
Finally figured it out. Simple really. The adjustable screw on the push lever was too far out, eventhough it was just short of the valve bushing it would not allow the plunger to move out enough to fully cycle the tool. I guess the push lever was out of play while firing sequentually.
Good to hear that it was nothing serious. I hadn't though of that. Makes sense though.
Thanks for letting us all know what the solution was!
Most likely the exhaust valve (it's plastic) in the head, or top cover
Question: Hitachi Strip Nailer Ribbon Spri...
I took apart the strip that holds the nails and thee ribbon spring came off I can not figure out how to put it back on. Any one with suggestions or video? Thank you
Remove the magazine. It's set up to just loosen the screw that holds the ribbon spring. It's pretty self explanatory once the magazine is off.