My nail gun hitachi nr83a2 only fires a nail half way
I just bought a new driver because my old driver broke "note that the new driver i bought was for a NR83A". I believe it has to do with the bumper in the cylinder when i turn the gun upside down it makes a little bumping sound? When i took the gun apart again the bumper looked fine. Is it supposed to stay attached to the driver somehow? or are the drivers for A and the A2 different thank you.
Re: My nail gun hitachi nr83a2 only fires a nail half way
The blade assemblies for the A and A2 are the same.
the pison bumper should not be attached to the driver, if the bumper is moving around inside the gun i suggest checking to make sure it was properly seated when the gun was reassembled. if it was, i suggest ordering a new bumper.
a cracked bumper will usually cause a broken driver.
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I presume the gun fires but no nail is ejected. A possibility is jammed nails in the magazine. Do you see a mark in your work piece of the driver blade? If yes then it is most likely jammed nails. If not could be a broken driver blade. If gun does not fire could be gas problem. (check in date, yes it does have a use by date), another cause of not firing is a broken wire particularly around trigger switch (switch is on trigger and hence the wires are flexing every time trigger is pressed). Another cause of not firing is a brass spring clip in handle assy if this breaks it stops the gun firing. Recently I have had more broken wires than anything else on these guns. Worth noting is that the Stanley Bostitch nail guns suffer the very same faults. Also note they are the same gun just different colours so you can fit Hitachi parts to the Bostitch and they are cheaper.
It sounds like your drive pin is jammed in the barrel. Can you see that moving freely? One of the two nails it fired may have lost a piece and is jammed in the barrel between the drive pin and barrel.
If this is the problem, You'll need to take a sturdy "drift pin punch" and hammer to drive the drive pin back down into the nailer. (I use an old drive pin from a discarded nailer as a drift pin punch)
Once the piston and drive pin are free again, the nailer should work fine.
This is a bottom fire tool. (NV83A2) You need to hold the trigger down and then as you place the nailer to the wood the safety will depress and it will fire once. This is usually done in one, swift action. If you do this in the opposite way by placing the tool to the wood and then pulling the trigger they often will double fire.
Remove all bolts holding the rails to the body of the gun (make note of the position of the parts as you take then off ). Slide out the pusher assmbly. If the spring is good (wound tightly and has the bolt hole), hold the pusher assmbly in hand and attach spring to body of gun leaving bolt loose. Slide the pusher back into the rails and attach rails to body of gun up against the bolt (snug down bolt and check spring action). Re-attach rails to gun. Some after market rails do not have the slot cut into front allowing easy install of spring (cut slot with dremel). Good luck
Your nailer is a very heavy duty nailer with very powerful blow. Works best with full size nails, not 2 inch range that are used in fencing, they are not spaced correctly for your gun (like hitting number 6 nail with sledge hammer). Open side door and remove the nails, leave the door open and dry fire gun against piece of rubber or old coiled air hose. The driver should return all the way up between shots and the feeder should move back then forward just as fast as the driver moves. If the feeder seems to move in slower motion then pull feed piston and replace orings and remove debris from feed cylinder. If the driver seems to stick out further than normal then lower bumper could be breaking up causing debris to enter feeder. Make sure that the driver is not bent and has a squared bottom, if rounded, remove and grind square. Finally adjust the depth control up or down slightly and bump fire for test, do not place gun on the work then fire. good luck
The condition of the driver oring is an indication of wear of all the other orings in the gun. Remove the nails and lightly tap the nose against piece of wood. If the driver drops to bottom of cylinder the oring is worn out and time for oring kit. Hitachi nailers are sensitive and will double fire if placing the foot against work then depressing trigger. Adjust the depth thumb screw several turns either direction then depress trigger and quickly bump gun against work. Good luck with your repair.
Removing jambed driver can be very difficult. I use an old hitachi driver with some metal removed at the tip to drive in the jambed piston. I grind the used driver slighty to allow for the jammed nails to pass the driver i am using for ram otherwise the old 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. Good luck
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.
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 NR83a has an adjustment just below the triggering plunger. It is a 6mm hex head bolt with a locking nut. Loosen the nut and adjust screw out several turns and re-test. Make adjustment as necessary. I have seen many of these gun without the locking nut which allows the bolt the adjust itself all the way down. AS parts wear this screw needs to be adjusted. The pushing lever and the plunger are wearing smaller/shorter, that is unless the locking nut was missing. Remove gun from air supply for safety when making adjustments. Good Luck an email if you have other qustion about this gun.