Hi... mine had the same problem when I bought it cheap second-hand. I made a spacer out of a washer that slips over the gas stem adapter and so far 100% fire rate. It holds the adapter closer to the cartridge nozzle and opens the valve that releases the gas when the trigger is pulled. Too easy! Good luck.
SOURCE: bostich gun problem
If the piston/driver is broken, the gun will fire however nailing will not take place because the piston will jam in the cylinder. Sometimes the cylinder will also crack when the driver goes. If the piston is not broken but stays down, then check the cylinder check valve, worn lower bumper, bent driver or cracked cylinder. 18 guage nailer has a very thin driver which will easily bend or break. Parts however are not expensive.
SOURCE: rapesco pro 140EL nail gun repair/ manual sought
Perhaps [url=http://www.tacwise.com/tools/view_prod.asp?code=21&back=2&type=1]This Link[/url] will get you going in the proper direction. It's not a schematic but it is the Tacwise homepage, hopefully they can be helpful to you.
SOURCE: nail gun wont fire
First - the air pressure has to be high enough - check the regulator on the tank to make sure it is delivering in excess of 60-70 psi (which I am sure you have already done).
If you have dry fired these guns (i.e. shot them off with no nails in them while you were lubricating them maybe) the mechanism inside could be damaged. I had that happen to one of my nailers (same brand). That was when I learned not to dry fire them...
Since both of them are not working though I would be more inclined to look at the air supply first.
SOURCE: Senco SN4 misfiring intermittently
This is a discontinued tool by Senco but there are still parts available for it. It sound to me that the o rings and possibly the firing valve need to be replaced. I would recommend going to Senco.com and you will find a complete parts diagram in their discontinued tool section. They also have a toll free number if needed and you can talk to their air pro. I have rebuilt quite a few of these and they are not that hard just make sure to clean all the parts and use lube when replacing O rings.
SOURCE: Air leaks arond trigger when depressed, but no nail fires.
Where does the air leak out from? If it leaks from the trigger DeWalt makes a trigger valve assembly part # 641006-00 list 8.89 BUT if it leaks from other areas we have to look into it deeper. If it is just the trigger valve let me know and I will give you instructions how to remove and install the new one.
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