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It could be because something is blocking the trigger door from closing . or its broke .if it may be something blocking it try to ckean it out really good oe you may order a replace ment if that doesnt work
you will need to replace part # 2131-D565 inlet bushing assyand you will need part# 2131-322 inlet removal tool to remove the old assy.http://www.searspartsdirect.com/ you push in the tabs on each side of handle with tool and slide assembly out then push new assembly in until clip tabs click then all done.
Check the fuel filter, air filter, and muffler for plugging. Check the fuel lines for decay or other damage. Turn the idle speed screw (T) CCW somewhat to prevent the chain from turning at idle. If the above doesn't allow the engine to run without the choke on, then remove the carburetor, clean the interior with spray carburetor cleaner and check the diaphragm in the lower chamber for flexibility with no holes or cracks. Hope this helps!
If the trigger still works to fire the single shot, then the o-ring kit should be sufficient. If the trigger area continues to leak air, then the trigger should be replaced as well. Keep the gun well lubricated as well.
Do you mean with a load on it. or without? In other words, while the air hammer is pointed downward, if you put (example, the chisel tip) against a surface to be cut/hammered/etc., it doesn't work? Because, under normal circumstances, it won't work while pointed downward unless the chisel tip is actually against something.
If it's doing that under load, though, have you checked the chisel you're using? If the shaft of the chisel is broken or marred, it may not be smoothly traveling the way it should. If it's okay, you likely have a broken piston inside.
Check tiny allen head grub screw has not loosened on bottom trigger button and is catching on housing, otherwise one of the o-rings is missing off trigger plunger or piston. Carefull of spring behind trigger button when loosening allen grub screw. You will find the plunger behind trigger button.
If you are asking what I think you are, pull and hold the hammer back with your thumb (it is spring loaded so don't let it slip), squeeze the trigger and hold it depressed, "Slowly" EASE the hammer forward until it is back to it's original position, then release the trigger. I hope this answered your question.
Use some wd 40 to clean the gun.Put it in where the air goes in,a lot of it.Put a bunch of it in the gun.Then use some transmision fluid to finalize the cleaning.If this helps the gun,then oil the gun with air tool oil.If this dones not work,then a rebuild would be the next step.
On most all nailguns when the trigger is activated air pressure is released from the headvalve causing the headvalve to open and fire the piston. If air leaks through the headvalve orings or through the headgasket port to headvalve, it will not fire. Try applying light grease to headvalve orings and make sure that headgasket is sealing around vent hole. If it fires then replace orings in headvalve for long term repair. Secondary problem is worn safety parts and trigger or trigger pin. If these parts are worn the trigger will not push the trigger valve pin all the way in when you bump fire the gun. With air supply disconnected, apply pressure to safety while depressing the trigger and check thet the pin is moving all the way into the trigger valve. Adjust or replace as necessary. Enjoy