I have a Dewalt dwd115 and when you plug it in it will do run I change out the trigger and that didn't,t work

Just the reverse of how it came out!

All parts above the cilinder and in high priority the rings on the top of the cilinder all of them are cured by working hours and the high friction temperature , beware on its age NOT ALL NECCESARY PARTS ARE NOT AVAILABLE ANYMORE !

Hi Fred:
Hmmmmm.
- Confirm there is power in the plug.
- use continuity meter to check that there is a complete circuit through the saw.
- broken connection in plug?
- broken wire between plug and switch?
- switch not functioning?
- switch set between forward and reverse?
- Speed control potentiometer contacts dirty?
- Bad brushes?

likely there is a screw or an allen head fastener inside the chuck that you will need to loosen and then rotate the chuck counter clsockwise to unscrew it from the drive shaft

clean switch with air pressure
if it does not settle your problem you will have to change the switch

you need to change switch,when trigger stuck,2 contact on switch weld ,after no contact at all because of wear

First before you open the tool ground yourself. The switch is probably static sensitive. Now open the tool and check for wires that may have come loose from the switch, or motor brush area. If no bad wires make sure the switch terminals are ok (not broken or bent and are tight enough to make contact with the batery terminals). Next check the brushes and make sure they move freely in the brush holders. You didn't state the model so it may not have brushes you can access. If all that is good disconnect the motor from the switch and secure the motor in a vise. Take wires with alligator clips and connect the battery directly to the motor for just a second to see if it runs. If the motor runs you have a bad switch assuming your battery is charged.

Yes that's normal it 's the electric brake. So no worries you didn't break it!

Dewalt has two triggers available for their framing nailer. The black trigger (390746-00) is a bump style trigger. While holding the trigger, you will be able to fire a nail by pressing nose against work. This trigger is preferred by most framers because it is much faster. Gray trigger will only allow one nail to be fired. Bumping will not work with the gray trigger. With trigger released, you must place the nose against work then pull trigger to fire. To fire next round, you must release trigger, pull gun off the work, again place nose against work then press trigger. Check dewalt web site for recall information. Some dewalt framers have been recalled for faulty trigger. Good luck with your projects.

I replace the trigger valve in my dewalt air gun It is still leaking air I use the right kind of grease on it