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I have noticed that Dewalt uses some vinyl orings in the trigger and the interior of the nailer that fail with time no mater if the gun is used or not. Vinyl orings will soften over time and will need to be replaced. I use buna or viton orings available from many suppliers including (oringsandmore.com). You will need to carefully measure for correct size. I use 2mmx 1.5mm orings on the trigger stem. Good luck
Several things to check. Below the bumper is a small plate that should fit snugly around the driver and keeps air from leaking past the driver. The bumper should not be cracked or missing pieces, replace as needed. On the outside of the cylinder below the cylinder seal, there is a row of holes that should have a snug fitting oring, this is the check seal that causes the driver to return (some nailers have a rubber band covering holes). Finally, the driver oring should allow the driver to move easily down cylinder but not allow the driver to fall under its own weight. Good luck
what I would recommend is removing the belt and running just the motor. I think that the bearings on the armature are seizing up and creating the noise. The fan bearing is hard to remove. Let me know if this is the case and I will give you directions on how to do it.
On the side of the nose there is a paw that's driven by a piston to feed the next nail into place. Check that the paw isn't damaged and moves freely. The piston has several o-rings that do wear out or break over time. If they are damaged you will need a rebuild kit for the gun if Dewalt still makes one for this gun. Go to http://servicenet.dewalt.com and look up your gun. There are two types for this model number so I don't know what parts to recommend. If a kit isn't available for the feed piston you should be able to order the o-rings seperately.
Try cleaning and oiling the slide,and make sure there is no debris on the slide when oiling,use wd 40 and then wipe it clean,then just use the air gun oil on the slide.
First does it retract after unplugging the air and if so I would look at the trigger valve assembly for a sticking plunger. If not then I would look at the firing valve in the cap. Let me know if I can help further.
I have heard complaints that this saw does not do well on angled cuts because of its low power. Try running a shorter and/or thicker extension cord and checking your input voltage. That's about all I can think of, hope it helps.
before tearing apart spray gun plunger and shaft with carb cleaner than spray with a spray lube like wd40 sometimes the plunger gets debris on it if still misfiring call dewalts 800 number they can advise of local repair shop and also advise if problem can be fixed by u
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