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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.
Your gun should work in the 90-120 psi range to get a consistant drive depth and with a few drops, 5-6 or a small squirt, of oil at the start of work and a few more in the afternoon if you are using it a lot. It is possible to use too much oil, if you over oil it and the bottom of the cylinder chamber gets full of oil or other gunk attracted to the oil it can get high enough to interfear with the return function. Also if you are using something other than pneumatic nail gun oil it is possible some o-rings were damaged. Either way you have to remove the head cap and check the internal o-rings for damage and clean out anything in the cylinder and head chamber.
Dewalt list the obvious causes below. Remember that the gun may not facilitate the use on specific materials that are just too much for the gun to handle. The most common cause for this issue is depth adjustment is not set properly. Also make sure that the nails being used are the correct nails for the gun. Its possible to buy the wrong type and they look very similar to the ones needed.
Here is The website addy for Dewalts pdf user manual and tech tips.
Low battery charge or damaged battery Charge or replace battery Depth adjustment set too shallow Rotate depth adjustment wheel to a deeper setting Tool not firmly applied to workpiece See instruction manual Material and fastener length Choose appropriate material or fastener length too rigorous an application Damaged or worn driver blade tip Replace driver/return assembly; see authorized service center Damaged or worn driver/return assembly
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.
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