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It was fireing fine and sudenly when I pull the trigger, the air goes through the exhaust without fireing. I took the plunger? appart and actuated the pin in the plunger but continued to do the same thing when put back together.
Here is a parts diagram. You may want to remove the four, top allen screws and pull off the head. Turn it upside down and with your thumbs push on the head valve assembly (items 9 and 10) and make sure it goes up and down freely. It is spring loaded (item 8). If it gets stuck it will blow air out the exhaust. Also a bad seal between it and the cylinder will cause the same thing.
When reinstalling the head assembly I push down from the middle of the head as evenly as possible to compress the head valve without cocking it and having it stick. I then hold the head with one hand while putting the screws back in with another. I use t handle allen wrenches. Also always lightly grease (or coat with air tool oil) any new o-rings you install. You don't want to run them dry. I use a tub of white lithium grease because I do so many. If you knew this already I apologize but it may help others that read this. Bostitch BT200 parts diagram
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If air is leaking from the trigger, check vinyl ball and oring on the white plastic firing pin. If air seems to leak from the plunger just in front of the trigger (with air connected and nails removed move plunger with finger and listen for change in sound), remove the head and pull out the cylinder. The outer oring to the plate around the cylinder is bad, however, clean the cylinder and lube with white grease. Good luck
If no air is leaking from the gun, take out the nails, remove trigger by removing 3mm hex head bolt to expose the trigger pin. With air connected and side door open so that you can see the feeder, quickly depress the trigger pin with finger. Gun should fire. If gun does not fire (only makes air sound at trigger) dissconnect airline, remove head and lube headvalve with white grease and reinstall. Test again. If ok replace trigger. If still no joy, replace trigger valve with new factory or generic (part # TVA6). If gun fires but does not activate the feeder claw, remove two 6mm hex bolts from front of gun and split apart upper and lower body and check white oring (part # 149885) Good luck
replace trigger , sounds like your trigger is keeping the firing valve in the open position allowing air to push the driver down, and exhausting the air out of the top, could also be that the firing valve itself is worn or broken
This isn't actually answering your question, but I couldn't figure out how to just post a question.
I have Bostitch BT200. For probably 15 years. Haven't used it much. Mostly used nails abou 1 1/4 inches. But recent project needed 5/8 inch. It will fire 1 fine. But won't fire another unless I pull the magazine open and push it in. Then it will fire 1 only. Have to open and close magazine every time to fire 1 single nail. It fires longer brads fine. What can I do?
Since the engine is running it needs to have an exhaust port, If it is in fine working order I would assume that it is simply the exhaust from the chainsaw. even with the trigger not pulled you are still idling causing exhaust build up. I would need more information to be able to delve deeper.
Check fuel line that goes from exhaust pipe to fuel tank. Make sure there are no leaks. With fuel in the tank remove the line from the exhaust pipe and blow in it. The fuel in the tank should move and bubble.
Without seeing it, It's hard to tell, the closest I can come is the extractor plunger, or a part of the lifter.3 pins in there, your trigger plunger, and 2 pins on the safety.None are the shape you noted. Going by this drawing anyway. I didn't want to take my 550 apart to look for it, But I will if I have to. There is one more pin in the end of the tube magazine.
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