Question about Stanley Factory Reconditioned Bostitch U/CPACK270 Finishing Nailer, Brad Nailer/Stapler & Compressor Combo Kit

1 Answer

Replaced leaking trigger valve wit new valve kit.

Nail gun will not shoot nails .
cleaned all parts in gun and replaced all o-rings with stanley bostitsh parts.


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  • Stanley Master
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I have seen many small bostitch guns all with different problems that did not shoot nails. Both of your guns have simillar triggers. You might try the trigger valve from the gun that works to see if that is the problem. Most no fire situations come from faulty trigger valve. The trigger valve used in your guns has a part that stays in the body of the gun; be sure to replace both parts. If still no fire check the following:
Remove the head and check if the piston/driver travels all the way down the cylinder with the tip of be blade showing at the nose. Some piston/drivers have a grove that must be aligned.

Check that the headvalve travels into the head and returns. Push the valve in with your thumb then cover the small vent hole at the base of the head where the gasket sits with your finger and release your thumb. The headvalve should be held in with vacuum then pop up when you remove your finger from the vent hole. If the headvalve does not stay pushed in with the vent covered, the orings are leaking and can cause the gun not to fire. Try lubing the headvalve with light grease such as silicone lube. Do not use bearing grease. Silicone lube is available in small amounts at plumbing supply/lumber outlets such as Lowes. It looks like wax feels like shortening.

Reassemble the gun and check your work. I test the gun with-out nails and without the trigger installed. Just place the nose of the gun on a piece of rubber, (I use a piece of heavy garden hose rolled up tightly into a coil) and press the trigger valve pin with your finger. The reason that I leave the trigger off is that sometimes the problem is caused by the safety mech not pushing the trigger pin correctly. enjoy

Posted on Nov 29, 2008

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