How do I change the brushes on a 14" dewalt impact wrench 14.4 volt

It could be something as simple as the brushes

Unfortunately Dewalt switches are solid state, meaning there is little to nothing you can do to fix them when they don't work. Occasionally spraying them with electronics cleaner and blowing them out with clean, dry air will make them work a little longer but more often than not you simply have to replace the switch. The part number for your driver is N084669. They cost between $65 and $75 so shop around or check with a local repair center.

I have the same problem and am thinking of cutting that extension to get it out. A real pice of !@#$$%

No, the brushes are part of the motor and pinion, Dewalt part number 607990-03. If you search "dewalt 607990-03" you can find several on-line vendors that sell the motor. They run about $50 plus shipping.

Look at eReplacementParts.com and the parts diagrams

Sounds like you have a gear broke that runs from the motor to the shaft. Take it apart and check it out. easy to put back together. atleast you will know for sure and may fix it while it's opened up.

hi atlas cop co supply and service all dewalt they have a webb page and are based inhemel hempstead hertfordshire england they also have an help desk hope this helps

Why do you think the brushes are worn.

all drill has brushes. this particular drill you need a motor assy
or switch. vibration & heat are common problem cu'z the drill not to properly