Question about Stanley Bostitch N88rh Framing Nailer Driver Piston 158582

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Bostich N88rh fires like a machine gun

As soon as air is hooked up. even without front safety pressed. I have oiled, tapped, thumped hooked and unhooked air numerous times...no change. Also air continues to leak through head when pressure is low. What can i check at the spring loaded out end?

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  • jason king
    jason king May 11, 2010

    seal it blown, get a rebuilt kit

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I Put a new trigger in and the safety on the head of the gun does not have to be pushed up in order to fire a nail in a board. I think when i pput it back together it was not done right. I do not have the instruction book.

Posted on Aug 04, 2010

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You either have a piston stop bumper failure or some damaged orings. Look on the schematic and the piston stop bumper is number 11, part #107236. A lot of times the piston stop bumper will disintergrate due to becoming brittle from the compressed air and not having enough lubrication. Look for small plastic balls in the head under the valve. If you see little plastic pieces than that is what remains of the piston stop bumper. You will need to remove the valve from the head cap in order to inspect the bumper. Also inspect all orings. The slightest damage can have big effects. One other thing to look for is damage to the plastic valve that rides on 3 orings. (2 out and 1 in) I don't believe you have valve damage because you say it is firing like a machine gun. This is almost always the piston stop bumper.

Posted on Sep 09, 2009

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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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