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first of all, you thought it was the orings? why? does it nake any noise( air leaking). make sure, positive, the safety his making contact with the trigger. It goes from the top all the way and makes contact on the bostitch nailers on the back side of the trigger and if its not set allthe way it wont fire. as a repair guy I have found a few to be more odd then others. if you feel comfortable enough to change orings , Ill assume you have had it apart. then take off the magazine an tap out the pin that holds the trigger in, not the valve just the trigger. this way you can bypass the safety and dignose the issue. when you get he trigger out push the button with your finger and air plugged in don't face it toward yourself or have anything over the end. Even with no nails it still hurts a lot when the driver hits you. Trust me on that.
If it still doesn't fire do you have at least a 100psi on the compressor?
while I have to say I am not a dewalt guy, I can try to point you in the right direction, assuming there are no leaks, then you state the trigger is not engaging , could be three things, one the trip ( safety) or the trigger valve or the trigger its self, if you feel comfortable pound out the pit that holds the trigger in. Just the trigger not the valve, then activate air to the gun, press the trigger, if it fires its the trip or the trigger rocker switch. the trigger can be examined see if its damaged bent or cracked, see if the safety trip is out of adjust, if it doesn't fire it could be the valve spring inside the trigger valve is broken.
don't worry just watch how it comes apart and remember you cant make it worse. it doesn't fire now. anything is an improvement
Common problem with dewalt due to vinyl orings. Simple tests to determine if trigger valve may work before re-installing. With trigger valve in hand, depress the trigger pin and hold. The bottom of the inner spool is visable in the opposite side from trigger pin and should move inward slightly with little effort when you push it (spool should have almost no movement inward before making contact with body of valve ). If the spool moves inward 1/16 to 1/8 inch, most likely the oring is too worn and not making contact with body of valve (when under pressure, this spool is held against body of valve (closed), and will open when pin is depressed (firing pin pushes on the spring and spring pushes open the valve) ). Next take valve apart and pull out the spool (spool should be difficult to remove from lower body of valve). With spool in hand push upper part of spool into the cap, should fit snuggly. trigger pin has two orings. The upper oring should fit snuggly into cap and lower oring snuggly into spool. The two orings on the pin are made of vinyl and fail. Notice that the spool has a small hole at the bottom. If the pin oring s bad air will leak past pin. Replace with 2mmx1.5mm black oring. After replacing the two pin orings, make sure the pin fits snuggle in the cap and spool, if not , replace the whold valve. The spring is usually good, but if rusty, replace the whole valve unless you happen to have the exact spring in good condition. The two outer orings on the body of the valve do not have to be replaced unless cut. Good luck
Shooting continusously caused by worn orings in the trigger valve and in the gun.Dewalt framing nailers use some vinyl orings (gold or clear in color) that fail too soon in both the trigger and the cylinder spacer (white plastic). Air out the nose of gun indicates air is leaking past the cylinder spacer seals (If piston is pushed down with air leak then headvalve seal is leaking (remove nails for this test)). If piston is not pushed down with leak, remove head and pull out the cylinder with cylinder spacer (white plastic). Place the cylinder on workbench with bottom up. Push down on locking ring and remove retainer to release all the other parts. Take picture or take note of parts together and as you pull them off to aid in re-assembly. You will need to replace the two orings between the white cylinder spacer and the cylinder. Order oring kit from dewalt or just purchase one ( # 141 universal oring ) and one metric oring 74.4mm x 3.1mm from hydraulic parts store. If the piston was pushed down with air leak, replace headvalve orings in the head. The trigger valve also has vinyl orings on the trigger pin. You could try replacing the orings but hard to find . Pin uses 2mm x 1.5mm. The orings on the inner valve should fit snuggly on the outer contact surface. If the valve just falls out the the body, the orings are too loose or the body is worn. I would just replace the trigger valve to be safe, however repaired works ok if you can find the orings. Trigger orings do not come in the kit. I would also remove the nails after each use and only reinstall them after air is connected and gun seems to work as it should. The Good luck with your repair.
It sounds like either the trigger valve is stuck of malfunctioning. It is item 68 on this diagram. With the toll UNPLUGGED from air make sure the trigger pin is releasing as it should when the trigger is depressed. Obviously do not check this with it plugged into an air line.
Either the plunger has not completely returned to the "pre-firing" position, or there is a defect in one of the o-ring seals. Make sure that the gun is sufficiently lubricated and if so, then next check the condition of the o-rings. An improper seal will cause this. It is also possible that the trigger assembly has a small crack/leak.
They all leak a little on firing. Is it a big blast of air or just a hiss? All guns have a 'safety' device that keeps them from firing unless you follow a set pattern. You must push the gun down where you intend to put the staple which releases the safety before you pulll the trigger. You must then release the trigger move the stapler off the piece push it back down again before you can fire another staple. You can get (free) frrom the manufacture a rapid fire shoe and trigger that allows you to hold down the trigger and bounce the stapler along your work shooting merrily away.
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