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Need a cylinder seal 41209 central penumatic nail gun

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  • jack2pratt Nov 07, 2012

    harbor freight discountinued no parts has a 2in wide cylinder

  • jack2pratt Nov 24, 2012

    the small seal worked was a little loose stoped air leak but driver wont return

  • jack2pratt Dec 01, 2012

    no check seal schematic does not show one does it need one or what will work thanks

  • jack2pratt Dec 05, 2012

    n12 check seal shows n a my gun dont have one has small holes no grove

  • jack2pratt Dec 15, 2012

    the exhaust bumper is missing could it cause the driver not to return

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I have used seals from Bostitch framing guns, however you must experiment. Bostitch seal number T60006 has inside diameter (lip of seal) of 1.875" and seal # N70155 measures slightly over 2". The lip should be about even with the bore of cylinder so that the piston will not push it off. If the seal fits a bit loose, you can apply RTV to inside and push on the seal and install the head. The head valve will center the seal while the RTV firms up. Wait 24 hours or longer before use. Small seal will usually not work; will split or fall off inside gun. Finally, I have made seals using hard roller blade wheel on my small lathe. Roller blace wheels are made of material that will work in oil and is about shore 95a hardness. Good luck.

Posted on Nov 08, 2012

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  • John Trevino Nov 25, 2012

    Return of driver to top of cylinder is controlled by check seal (rubber band or orings installed around the outside of the cylinder covering a series of holes). Pull cylinder and check that the band is in place. If the band is in place, check for bent driver, piston oring too tight /too loose, restriction in headvalve not allowing air to exhaust or too much air leaking past the nose of the gun or a combination. The driver should move with slight finger pressure but hold in place. There should be a seal or metal guide below the bumper to prevent too much air from leaking down the nose thus the pressure to push driver up is lost. Good luck

  • John Trevino Dec 02, 2012

    I believe your nailer may be a chinese copy of the the old bostitch n12. Take a look at the parts list of n12 here:

  • John Trevino Dec 02, 2012

    http://www.ereplacementparts.com/bostitc...

  • John Trevino Dec 02, 2012

    Notice on parts list of the Bostitch n12 where the check band is located.

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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.

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Air leaking from the bottom of the gun (path of driver) indicates that cylinder seal orings are leaking (if without nails in gun the driver is slowly pushed down the cylinder when air is connected then cylinder seal is leaking ). Cylinder seal snaps on the top of the cylinder and should fit snug and have no cracks. Easy fix for cylinder ring. Remove head and pull out cylinder. Then remove the cylinder ring (part #n50015). Examine ring for cracks and replace as needed. Examine body of gun where spacer oring makes contact and sand fine scratches. Replace orings as needed. If air is leaking between body of the gun and nose casting, replace gaskets. Good luck.

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Looking for a Cental Pneumatic 41209 roofing coiled nailer bucket replacement


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Central tools is their 800 phone number listed on the document below. That gun was a good copy of the bostitch N12 roofing nailer and also close match to Unicatch roofing nailer. Look on ebay for a photo of the N12 and unicatch. Harbor freight got a lot of returned nailers. Maybe one of the local stores have returned nailers for the ;parts. ;Good luck


http://images.harborfreight.com/manuals/41000-41999/41209.PDF

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1 Answer

I got air leaking out the barrel where the nail shoots from.


Without model number I cannot be more exact, however, air leaking from nose as soon as you connect the airline indicates that the cylinder spacer orings are leaking. The cylinder is usually sealed by a plastic or metal ring with an oring at the outer edge and seals against an oring installed at the cylinder. Broken oring or grit entering the gun will cause the orings to leak. A quantity of air leaking from the nose when you fire a nail indicates that the lower bumper is cracked or missing pieces. Air leaking from nose with driver being pushed to bottom of cylinder when you connect the airline indicates that the cylinder seal at top of cylinder is leaking. Parts are available at www.toolpartsdirect.com Good luck with your repair and post again with model number if you need more help.

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There is a flow of air continually blowing from the gun at the nail loading location, causing it to fail to properly sink the nails into the wood


Can't be specific without model number, however, air leaking around nose area (where driver strikes nail) is indication of orings not sealing around cylinder spacer and body of gun and/or leaking at cylinder spacer and cylinder. Most likely grit has entered the gun and has begun to scratch metal and orings. Time for a reseal kit available thru Dewalt service center (or if you are a tinker-er, remove head and pull cylinder, remove fine scratches on body of gun with fine sandpaper and lube with plenty of silicone lube paste ). Final note, air could be leaking between cylinder seal at top of cylinder and headvalve. Air leaking here would also come out of gun thru nose, but the driver would be pushed down cylinder with nails removed. If no scratches are found and orings appear to be in good shape, then suspect this seal.
Dewalt used vinyl orings (gold colored) that do not last allowing leaks. The orings that come in their repair kits are also vinyl (not good). If possible replace bad orings with buna-n or viton from bearing house. Good luck

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Just replaced o rings and piston bumper, but gun still leaks air (out of nozzle) and wont fire at all


Air leaking thru nozzle (where nail exits ) can be caused by two issues. Air leaking past valve rubber at top of cylinder where headvalve seals when under pressure. If leaking at valve rubber seal the piston will usually be pushed down if there are no nails in gun. If the driver stays up while leaking then problem is at cylinder plate. This plate has two orings that seal air pressure. On seals against the body of gun and the other seals against cylinder. Leaks can occur if body of gun is worn, warped or has scratches where oring makes contact. Also look closely at the plate for crackes. Replace parts as needed. Good luck

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On the trigger of my Bostich Spiral load nail gun AND my Bostick trim nail gun air is leaking profusely from the trigger. Nail guns were not in use for about a year. When I first used them this weekend,...


A nail gun works on compressed air.
When you hook the air hose to the gun it fills a cylinder with air pressure.
When you pull the trigger. the cylinder pressure is released onto a firing pin that shoots the nail.
The air pressure line is also connected to the trigger and therefore the trigger has to be sealed.

When ever using a nail gun, you add a bit of gun oil in the back of the gun (not 3-in-1motor oil, it has to be non-detergent gun oil)

If you haven't used the gun in a while, it is best to oil up the gun and let the oil run down into the gun.
If you use anything but gun oil, the seals will give out.

Your trigger seal has given out. It is probably an 'O' ring. You can access it by taking it apart. Look for the O ring.
Bostich makes re-build kits for the different guns that you can buy on-line.
Back when I was in construction, there were several nail gun shops that sold and serviced nail guns, and sold nails to the contractors. I don't know if that business model is still active or if you have to send the guns to Bostich service center.

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I have a constant flow of air coming out of the front of the firing nozzle. What is causing this? I have a Bostitch N50FM.


Air leaking from gun where nail is driven out is caused by faulty cylinder seal and /or orings that seal cylinder to body of gun. Remove head and examine cylinder seal that sits on very top of the cylinder, if cracked, damaged or is loose fitting, replace. Pull cylinder from body of gun and remove the plastic ring. Examine ring and replace if cracked. Replace orings that contact ring. Parts are available at www.toolpartsdirect. Good luck

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