Nail Gun Issue - Building a Shed - tractor used to move lumber so it qualifies

[DFB]

Look up your model number here...you can get the correct parts diagram.

DeWalt Air Nailer & Stapler Parts | DeWalt Air Nailer & Stapler Repair Parts and Accessories - toolpartsPro.com

I've used this place for Makita tool parts before. Decent shipping charges too.

 

[Ford850]

My Porter Cable guns do the exact same thing if they have a jam. I push the gun into position, depress the trigger, and only get a faint 'hissss' from the gun. Happens on occasion, and every time it has been a nail, or part of a nail, jammed in the plunger are. As others have said you should be able to pop it open and find the culprit.

 

[s219]

I will agree with this, all of my nail guns are Senco, some are 40 years old and I have used them to make my living.

That got me thinking, I have never actually had a jam with my DuoFast framing guns, which are about 35 years old. Occasionally a nail will break off the clip before it feeds down the rail, and I will need to jiggle the gun to get it to fall out the tip, but that's the worst of it. I have had lots of jams with my smaller and newer Porter Cable finish guns though.

 

[Beltzington]

Watched the video, not much of actual instructions but did show what it looks like taken apart.
Appreciate the advise, took a LED I use to inspect gun barrels and can not see anything jammed in the plunger. I had left in on my workbench for a day and was suprised of the amount of oil that had leaked out, I did not think I put that much in to start and with my other air tools the oil blows out. Once it stops raining I am going to try it one more time and if it still doesn't work I'll start the disassymbly. Dewalt has a dry-fire lockout I am wondering if it thinks it is out of nails. I can't figure out how this works anyone have an idea?

 

[Beltzington]

Well, I believe I found the problem, once I got the trigger removed it was clear the air leak was comming from the trigger valve. Removed two roll pins it came right out, it is a plastic valve with two external and two internal o-rings, the rings looked to be in good shape so I was hoping cleaning and silcon grease would fix the problem but unfortunatly after reassymbley it still leaks. Some web search shows this is a fairly common problem with nail guns and the part is only $12 from Dewalt. Now I'll just have to wait until it arrives in the mail.

 

[Beltzington]

Received and installed the new trigger valve this afternoon, happy to say the nail gun is working again. $12 part, $8 S&H, empirical knowledge - priceless.

Appreciate all the advice.