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My hitachi framing naile has a lek somewhere and the piston wont return

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You more than likely have a busted head cap and or exhaust valve. Without any more information about the model nailer you have it would be hard to walk you through a breakdown. If you have this information I can help.

Posted on Sep 14, 2009

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Posted on Jan 02, 2017

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1 Answer

Why wont my hatachi nail gun shoot 1 3/16 nail all the time


Has the tool been lubricated properly to Hitachi's recommendation? Is the airline pressure running about 90-100 psi? If not try giving it more pressure. Sometimes the compressor may have too smaller receiver (Tank) for what you are trying to use it for, leaving the tool unable to return the piston/driver to top dead centre.

Sep 13, 2014 | Tools & Hardware - Others

1 Answer

Hitachi nail gun


If gun firing but nails not being driven could be one of two basic problems:
1. Nail jammed in magazine not allowing nails to move up.
Empty magazine, does follower move to top of magazine. Push gun against work piece, does fan motor start? Yes - jam in magazine or lock out bar not operating. (this would allow nail un to fire when out of nails)
2. Piston/driver not returning fully after firing, hence driver blade on top of next nail instead of behind it. This could again be caused by a jammed nail or just a nail head. Another case of not returning is the combustion chamber not making a good seal, check O rings on framer (they are steel rings on bradders) it may just need a good clean it is surprising how dirty they can get and if not cleaned a build up of dirt could break a seal. If not been cleaned for a long time worth checking piston rings, worst case scenario dirt builds up around the rings and stick fully in requiring new piston if the rings will not come out.
Nail guns work on the principle that an explosion pushes the piston driver forcing a nail into the work piece, after the explosion a vacuum is created and it is this that 'sucks' the piston/driver back up the cylinder.

Mar 27, 2014 | Tools & Hardware - Others

1 Answer

Misfires new gun


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

Mar 24, 2014 | Hitachi KNR90AE Round Head Framing Combo...

1 Answer

I have a Hitachi nv 83 nailer,the firing pin sometimes does not return all the way back in,I have pushed it in with a screw driver and it only works for a short while.Any help it would be much...


Are you oiling your nail gun, it sounds like it's suffering from a lack of lubrication? It doesn't take much pneumatic tool oil but nail guns have to have it to work for any length of time. If you have been oiling the gun, you may have o-rings inside the gun that are worn, broken, or blown out of place. You can remove the head and check the condition of the o-rings and see if the inside of the gun is dirty. Clean the gun up and pay partucular attention to the o-rings on the bottom half of the cylinder and piston. When reassembling the gun be sure to grease the o-rings well. If you still have the same problem you may have to rebuild the gun by replaceing all the o-rings. Unfortunately Hitachi does not make rebuild kits so you have to go to their website on an aftermarket site like www.ereplacementparts.com and order each and every o-ring.

Jun 26, 2012 | Nailers Hitachi Nv83a2 3 14" Coil Framing...

1 Answer

I changed the feeder springs in my hitachi NV83 a2 and it wants to double fire and jaming up the driver with seconded nail. it was skip nailing before i changed springs. any help you could give me would be...


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

Jun 16, 2011 | Nailers Hitachi Nv83a2 3 14" Coil Framing...

1 Answer

I was shooting 3 inch nains and I switched to 2 inch. after 20 or 30 nails it failed to drive a nail. The driver makes an indention in the wood but does not drive the nail. What are the problem...


Check that the driver is returning all the way to top of the cylinder. Driver will not return to top when lower bumper is cracked, driver is bent, or piston oring is too loose/tight or low air pressure to gun. Also check that the two inch nail is the same angle as the three in. Place the nails on the outside of the rails with the heads aligned with the rail. The first nail should align with the path of the driver. If the head of the first nail is angled back away from the path of the driver, will miss fire.

Mar 25, 2011 | Stanley Bostitch N88rh Framing Nailer...

1 Answer

Hitachi nail gun,piston/nail push rod wont retract after pushing nail (stays protruding out of gun so the remaining nails stay underneath it


You have one or more worn o-rings in the head of the gun. They direct the air to the proper parts of the gun to first drive the nail then to return the driver to the top of the gun for the next nail. Depending on the manufacturer and your model number, some companies make kits to replace the o-rings (always replace all of them). For some companies you have to get a breakdown of the gun and order each o-ring seperately.

Oct 25, 2010 | Hitachi Tools & Hardware - Others

1 Answer

Not firing right


the nail return spring for the piston is stuck or broken,dis mantle the gun and clean and check the spring to see if its broken

Apr 06, 2010 | RTO PasLode 900420 Impulse Framing Nailer

1 Answer

Pin to drive nails does not return afteer first nail bostich nail gun n89c_1


the piston that drives the nail is commonly known as a single acting spring return meaning air pushes the piston and the drive pin down driving the nail in and a spring is supossed to push the piston and pin back up to load the next nail the springs are not usaly very strong so lubrication could be the problem as well try using some "air tool oil " available anyplace airtools are sold do not use wd-40 or engine oil while these may offer temporary help they will come back to haunt you if a good oil doesn,t sole your problem then its "spring time" although they have lots of safeties built in when working with a problomatic nail gun please be careful high presure air risk of injection fast moving projectile again risk of injection Good Luck

Oct 09, 2009 | Hitachi NV45AB2 Roofing Coil Nailer

1 Answer

I have been rebuilding Hitachi nalers for about 2 years now and this one has me stumped. It works fine if you single shoot it. If you hold the trigger and try to bounce shoot the nails, the driver will not...


The roofers that frequent my shop want their nailers to work like machine guns. Here is what I do to make the hitachi 45 nail fast. Remove the cylinder and sand the fine scratches where orings meet cylinder. I use a rubber slug with a small bolt through the center. The rubber slug fits snuggly into the cylinder and the bolt into chuck of drill. Turn the cylinder with the drill while holding fine sandpaper against the scratches untill smooth. remove the nose from body and replace the sheet (part # 877125) and the bumper. If the sheet fits loose on the driver and the bumper has cuts or missing pieces, the driver will not return with full force. also the oring on the piston should not be too tight. Just snug enough to hold the weight of the piston. While nose piece is off check the air passage to feed piston for trash, use a small wire and push through to make sure. Make sure the orings on the feed piston fit snug. Actually push the feed piston by hand in the nose piece to make sure the three orings fit snugly. A loose feed piston will reduce nailing speed. Finally replace the boot on the firing pin. If the boot is blown off its seat with use replace the firing pin. A loose firing pin will waste air and lower pressure reducing nailing speed. Good luck

Dec 01, 2008 | Hitachi NV45AB2S Coil Roofing Nailer

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