I ran out of nails not knowing it and continued to use gun..think I damaged something. Hammer must be pushed back in manually after each nail is shot or if gun is held foward facing down plunger comes out under gravity towards nail,hence allowing air to escape from somewhere. Thanks very much Joe D.
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Re: Hi I have a np80
Joe it sounds like you have damaged the return puck inside the cylinder. when the piston bottoms out their is a rubber puck inside that cause recoil.over time it can become hard and no llonger resiliant - when you dry fire it can shatter or crack . if it does not have this then it just needs oil . are you oiling every use? usually 3 drops at start of daywill run them for years. at any rate you will have to do the following to confirm. diconnect air - remove four crews that hold cover or back of cylinder- should be obvious-lift off cover - this will expose back of piston whick is connected to drive pin. you mat have to push it backwards through guide late to eject completely.Inspect cylinder and piston -is it dry? no oil? inspect o rings around piston there will be two one at top and one at bottom. oil with damp oil cloth and reassemble it reverse. take care to twist cylinder to line up drive pin- this is critical.Do this and get back to me. good luck
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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 your using refills that have wire holding the nails together.
Check to see if bits of wire, debris is collecting in around the striking hammer. I switched to paper and never looked back. Must have gone through 5k worth of nails and rarely jams. Other things to check,
1. Check the striking hammer, make sure it is not bent or damaged.
2. Check air pressure, Low pressure can cause jamming, misfires.
3. If the tool needs pneumatic oil, 2-3 drops before you start good rule of thumb.
4. Check spring return. Sufficient pressure must be maintained or the nails will not feed properly. Misfires, incorrect feed, jamming etc.
I had a Hitachi brad nailer and it was horrible. Fire 1 brad nail would jam or misfire. Did everything I could think of nothing worked. Put it up, got a Rigid brad nailer and never looked at the Hitachi again. :)
Sometimes you just get a lemon! (PS I understand you have a framing nail gun. Brad nail gun above is used for an example)
Hope this helps
I don't have that same model but my gun started doing something similar a while back. I was able to disassemble the head of the gun and found that the hammer or piston that drives the nail had rounded itself off and wasn't able to make good contact with the nail head. Instead it pushed itself on top of the nail and got wedged. It's nearly impossible to see the stuck nail or dulled piston head without taking it apart. Hopefully this will help.
Simple test for piston jam. With nails removed and latch open, point nose of gun up then down. If the driver slides up and down in the cylinder as you move the gun, replace the piston oring (test gun for proper operation). If the piston stays in the upper most position as you move gun (push driver to top position), check lower bumper and bottom seal under the bumper (sheet). Replace as needed. If the lower parts are in good condition (good piston oring, lower bumper and sheet) , replace the 3 orings on the feeder piston. Good luck
If a nail is stuck between the driver and nose of the gun, you will need to forcefully push the driver back into the gun. Remove the head and cylinder and place the body of the gun on piece of plywood with nose pointing up. Using very sturdy steel rod, hammer the driver down. The steel rod needs to be slightly thinner than the driver to allow for the stuck nail. I use a broken driver ground thinner on the side that will need to bypass the stuck nail. Careful when striking hard steel with hammer, could spinter (I use a heavy brass hammer). Good luck
Try removing stuck nails without taking apart gun. Remove remaining nails from rails. Use long piece of allen wrench or similar hard steel and grind the end to allow for jamed nail (I use a broken driver blade ground slightly thinner to allow for stuck nail). Use heavy brass or copper hammer to push driver up to top of cylinder. If after a couple of heavy blows the driver does not move, remove the head of the gun and pull out the cylinder and place the body of the gun on plywood. This will protect the head from damage. Good luck
Removing jambed driver can be very difficult. I use an old driver closely matching driver in the gun so that I know it will fit the nose. I grind the side of the used driver slightly to allow space for the jammed nail to pass the driver that I am using for ram otherwise the ram (used driver) will jam up also. To protect head and cylinder from damage I remove them and set to side. Place body of gun on soft wood and hammer old driver blade with heavy copper or brass hammer. Striking driver blade metal with regular hammer will/could produce flying metal chips (use eye protection) Good luck
The check seal is what causes the piston to retract. Remove cylinder and examine check seal. It is a small band that covers a series of holes and should fit snuggly around cylinder. Other factors that have effect on piston retraction are, split/cracked cylinder, bent driver and lack of lubrication. This gun is tricky to rebuild. Make shure that all the parts in the head are placed correctly. The kit does contain all the parts that you need. Good luck
If the nails are stuck in the rails, remove the rails and fish them out. If a nail is stuck between the driver and nose of the gun, you will need to forcefully push the driver back into the gun. Remove the head and cylinder and place the body of the gun on piece of plywood with nose pointing up. Using very sturdy steel rod, hammer the driver down. The steel rod needs to be slightly thinner than the driver to allow for the stuck nail. I use a broken driver ground thinner on the side that will need to bypass the stuck nail. Careful when striking hard steel with hammer, could spinter (I use a heavy brass hammer). Good luck