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With a little screwdriver you shall first remove the first dustcaps and then you see the brush holder caps which have to be removed with a suitable screwdriver thats by the most machines not hidden but however by this tool
Ok about changing the brushes but have you searched if the place where the brushes are located allow the brushes to move forward freely or they are in a way were narrowed so that the brushes can only move for few millimeters?
Obviously too late for you, but it may help others. I had the same problem with a new Makita 18v lithium grinder and this worked.
Remove battery, remove brushes. Using good quality cotton buds, dip in Methalated spirit and insert into hole for brush down to armature, slowly rotate head of machine. Change cotton bud and repeat process, then clean the brush heads. Re-assemble and try. Note: Meths will dry completely leaving no residue, unlike turps etc.
I fix cordless DeWalt drills every week!Look for two black carbon-like blocks found on either side of the commutator ( the central spindle ) they will each have one wire on the outside end attached to a spade connector so the brush can be easily removed by prying it out from beneath the spring holding the brush against the commutator. Then the wire can be removed and the new brush installed.
Go online to http://www.toolpartsdirect.com and search for your model dewalt drill. they have an exploded diagram and parts listing for each model drill. That will identify the brush for you if you have never seen one before.
If the drill was operating intermittently with lots of noise and usually blue sparks coming out, loss of power, increasing intermittant operation it would almost certainly benefit from replacing the brushes.
If it is simply dead, and was ever dropped. check the battery terminals and the trigger mechanism. Of course inspect the battery and check inside the drill for loose or broken wires and connections. I hope this is helpful. Good luck!
While some loss is expected. You can change channels. 1-6-11 are the best for cutting signal loss because they do not overlap.. 2.4GHz device in operation, like a cordless phone
or microwave oven can cause signal loss. Metal in walls, electrical devices and wires can also cause loss.