Check Firing Valve: This is the key part which regulates compressed air in or out of the cylinder sleeve. In oiled tools, the firing valve is a circular piston equipped with o-rings. The no-oil tools feature a unique, inflatable diaphram that serves as the firing valve.
If you buy a reconditioned gun, ask them to hook it to a compressorer,
then put a stick through it. If it doesn't jam or feeds properly, then
it should be ok.
Clipped head nails, picture bullets in a gun, they are all round heads
and need to be stacked so they don't jam the one below as they feed.
With clipped heads, they come in sticks, its just so they don't grab
the nail behind.
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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.
I had this problem too, and finally figured out what was wrong. If you have cleared a jam and have put the nail gun back together, then all you get is a 'thunk' when you try to drive a brad, you have put it back together wrong, as I did. Take the two screws out and pull out all four pieces -- three plates and one skinny 'T' shaped piece. Look inside the unit and you'll see a pointed piece, which is the hammer that drives the brad in. This next step is key: put the first plate back in (the one that is flat on both sides) making sure that it slides in UNDER the hammer. The hammer fits loosely in its housing, so it may help to turn the nailer upside down so that the hammer falls down, giving you the room you need to get the plate in--again, so that it's UNDER the hammer when you turn the nailer back over. Once you have done this part, simply slide the second piece in (the one with the fluted strip down the middle), slide it in fluted side up, then the 'T' piece (with the 'T' in first) then the last piece with the wider groove that contains the 'T' piece. Replace screws and you're back in business! This information may be in the instructions, but I have long ago thrown those away.
If the nail will not advance, easy test will determine problem. Open door and remove the nails. Lightly tap the nose of the gun against coiled rubber hose or soft wood with door open. If the driver falls to bottom, the piston oring needs to be replaced. The driver should stay at top of cylinder. Next pull back the feeder to rear position and check for tension. The feeder should spring back towards you when you push. Finally, the check paws on the door should return to extended positon when you push on them. Replace springs as needed. Connect air to gun and rapidly bump fire the gun against rubber. The feeder should move back and forward just as quickly as the driver moves. 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 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
if u are right nails for gun,then make sure when u put coil in and feed in front of firing pin the nails are straight with pin and connecting wires are not bent causing nails to fall out of alingnment.
If the piston/driver is broken, the gun will fire however nailing will not take place because the piston will jam in the cylinder. Sometimes the cylinder will also crack when the driver goes. If the piston is not broken but stays down, then check the cylinder check valve, worn lower bumper, bent driver or cracked cylinder. 18 guage nailer has a very thin driver which will easily bend or break. Parts however are not expensive.