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Pneumatic stapler trigger stuck

I have a rigid (home depot house brand) pneumatic stapler that has been used all of 5 times since purchased. I went to use it yesterday, hooked it up to my compressor, lined the stapler up with the material, pulled the trigger and instead of a nice pfffft of air and a staple being imbedded 2" into the wood where moments ago wasn't the trigger simply Clicked, it wasn't a dead trigger feeling like you get when pulling the trigger without an air connection, it like I said Clicked, you could feel the air pressure when pulling the trigger just none was released when the trigger pin was pushed in. The trigger pin remained in the pushed in position and the trigger itself without the pin pressed against it just flops about. I quickly disconnected the gun from the compressor envisioning an unwanted rapid firing of 2" staples being impaled into any unfortunate objects in their path due to the stuck open trigger even knowing it an improbable occurrence. Any thoughts as to what has happened to this barely used gun? Thanks Les

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The click sound indicates that the headvalve opened to fire piston down the barrel, however piston is already down or is stuck in-place. If the piston/driver is not broken or stuck, push piston to top of cylinder to reset. If only one shot and piston stays down, most likely the check band is broken. Check band is on the outside of cylinder (lower part) is is usually an oring or band of rubber covering small holes drilled into cylinder. Check valve /band is what causes the piston to return to top. If check band is good, most likely piston is bent or oring is too tight. If you open the gun, lube all parts with white grease or silicone paste lube. Good luck

Posted on Nov 08, 2012

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SOURCE: Makita AF503 Brad Nailer won't fire nail

Take head off of tool. Clean and lube orings on the head valve . Do not use wd40 use air nailer oil.

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