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Trigger is frozen gun will not fire

It is a finish gun sfn2

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I have worked on many senco finish nailers including the sfn2 and have found them to be very reliable except when the wrong type of oil or too much is introduced into the gun. Some oils can swell the orings and cause the problem that you are having. No worries however, orings are available at www.toolpartsdirect.com as well as parts list. An oring kit costs less per oring. You must remove the head to access trigger parts. Part # LB5005 (firing valve) is the part that fails the most on your gun but failure of this part leaks air out of top. You should keep a spare firing valve just in case. Enjoy

Posted on Dec 09, 2008

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Keeps repeating itself


Most nailers have a two position setting on the trigger to allow for single fire or bump fire. If set on bump fire, the gun will work better when you bump fire the gun instead of placing the gun on the work then depress trigger. Bump fire works best when safety spring has good tension. Easy test. Make sure that the safety spring is in place (with air hose removed, contact foot should spring back quickly when pushed against work). With air connected, hold trigger and quickly bounce the gun against the work. If the gun does not fire when you bump, the trigger is most likely set to single fire. With trigger set to single fire, you must place the gun against the work, then depress trigger. If the gun shoots two nails while set to single fire, most likely worn trigger or worn out trigger valve. These parts are not expensive and are easy to replace. Good luck

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1 Answer

NEW BRAD NAILER ONCE LOADED WILL NOT WORK


Many modern brad and finish nails use a sequential fire trigger system. You have to push the nose of the tool down to depress the safety THEN pull the trigger. This is the opposite of how a bottom fire works where you hold the trigger and bump the nose to fire the gun.

Mar 02, 2012 | Air Nailers

1 Answer

Only shoots out one nail for every 4 or 5 trigger pulls


The gun will miss fire if the driver does not return to top position allowing nails to move into position. Could be bent driver, faulty trigger, cracked lower bumper or check valve not in place. Easy to check if trigger. Remove air supply, and remove the pin holding the trigger. Fire the nailer by depressing the firing pin with your finger. If the gun works ok, single fire trigger is faulty or safety foot is out of adjustment. If still miss fire, remove head and pull out cylinder and piston. Check for bent driver, cracked lower bumper or black band (check valve) is out of place on outer part of cylinder covering a row of holes.

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1 Answer

GUN DOES NOT FIRE FOR SEVERAL ATTEMPTS--even though gun is pressed firm against work---just had unit serviced and trigger valve replaced-----any suggestions? thanks joel


Remove nails and remove trigger to expose trigger valve pin. Place nose of gun against rubber pad or old coiled up air hose to absorb impact of driver and with very quick and deliberate motion press in trigger pin. If gun fires, then problem is with safety foot not pushing trigger pin all the way in (or worn trigger). Make adjustment as needed or replace faulty parts. If gun still does not fire, then likely problem is with headvalve. If headvalve orings are leaking, gun will not fire. Test for leaking orings as follows. Remove head and remove headvalve, apply silicone paste lube (plenty) to all orings and where orings contact. Assemble and do test above. If gun fires then surface where orings contact is allowing air to leak(smooth with very fine sandpaper if scratched).

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1 Answer

Dewalt angled finish nailer, just got, when nose is depressed and trigger pulled, just sound of air releasing, wont fire..... need trigger assembly?


if air is released when the trigger is pulled then stops when the trigger is released , then the trigger is doing its job. its probably a firing valve issue. four screws will take off the top cap of the gun the firing valve is inside of the cap . first check to see if the gun has enough oil( unless its an oil less gun) if its dry then grease or oil all of the orings, if this dose not work check to see if any of the orings or plastic parts need replacing. pls rate this answer...;tks

Feb 14, 2010 | Dewalt Air Nailers

1 Answer

Senco sn2 air leak around out top only when the trigger is pulled


There is a cracked seal on the firing valve. It looks like it cant be replaced but it can. Look in your parts breakdown .It seals the firing valve to the cylinder

Apr 08, 2009 | Air Nailers

1 Answer

Nail gun double fires


There is one main part that can be the cause of the problem.

The trigger. Check to see if there is anything out of the ordinary with this. There should be some moving components attached to the trigger itself. Is any part of the trigger touching the button in the body of the gun when safety is not depressed. If the lever on the trigger is pushing on the button, even a little bit, It will allow the gun to fire again and again.

Mar 12, 2009 | Air Nailers

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