Loaded and hear it fire but no staple fires out
Unplug it and flip it over and see if there is something jammed if not, then when its still upside down, and unplugged find something flat and stiff about the width of the blade of the stapler. slide it up and make sure the driver blade is returning. if it doesn't go up the staples cannot feed and while it will fire it wont be on top of the staple when it fires.
SOURCE: AS 300 electric stapler--pulled out
What has most likely happened is part of a staple is stuck in the front portion of the stapler where it forms the staple and presses it into the stapler.
You would most likely have to remove the stapler, and remove the binding staple from the stapler head.
SOURCE: LOAD IT
pull out the spring at the end of the gun. turn the staple gun upside down. Lay the staples in the track pointed side up, push in the spring slide so that it locks. You are ready to staple.
SOURCE: duofast stapler shoots a staple as soon as i plug in the air
I have rebuilt many older Duofast staplers and have seen the problem that you describe. Duofast staplers have twice as many orings as other brands of nailers. Some people say that the nailers are over-engineered. I say that they were built to last a lifetime and need extra care when working on them. Duofast relies on various springs to reset functions or operations. For example there is a spring within the trigger valve that you do not see when you are rebuilding that may be weak and cant overcome the friction of the new orings. That spring resets the trigger after firing. If you replaced all the orings but did not replace any of the springs within the gun, it will take a while for the gun to get back to normal. I use new springs and lube all the parts with silicone lube instead of oil. Silicone lube is sold at Lowes in the plumbing department. It is used to lube orings in faucets. Instead of taking the gun apart, try using a little extra nailer oil in the gun and cycle the gun with-out nails dozens of times to work-in the new orings. If the problem does not go away, take a look at a breakdown and try streaching all the springs just a bit, or make sure that all the springs are in place. Also make sure that the head gasket is in good shape or the oring that seals the headvalve port to the body. Good Luck with your repair and email if you have other questions.
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