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OMG!!! "It" doesn't Loosen?! Does it Listen? LOL. OK enough! I have had these BD drills before, and sorry they are JUNK! You would REALLY be better off by purchasing a Craftsman Nextec 12 volt drill. It is Lightweight, smaller for small hands, has a flash light built in! AND in a set comes with Cool Flashlight that stands up. It comes in a bag with a charger for $50! BD has NOTHING like this! OK I have HILTI drill ($300)! I never use it cause I use the heck out this great little Craftsman drill.
OK solution to your drill bit problem...EASY. Go and buy some WD-40 in the blue-yellow can ($4-5). Spray (ALOT!) around and under where the bit is and where the cap that spins is. Do Not spray into any vents! It May catch Fire. Let it soak x 15 min. Spray a little again. Then Grab a terri cloth towel wrap it around the cap that spins and the bit and reverse the motor to loosen the drive. Be sure to have the drill on Max setting (the drill bit icon). It WILL come off.
Most drills you have to take apart. The brushes are usually located by the motor inside the plastic case of the drill. It really depends on the drill for how to remove the old brush and install the new one.
Dewalt doesn't have a DC987 chain saw. They do have a cordless drill with that model number and you can find a good parts diagram at www.ereplacementparts.com. Put the model number in the search by block and you'll get a good breakdown and a list of what parts are still available. NOTE: Shop around once you get the part number, ereplacementparts isn't always the cheapest place to get parts.
open the jaws of the chuck up all the way. There is a retaining screw at the bottom ( under where the drill bit would go). this screw is reverse thread. once the screw is out, get a 3/8 inch allen wrench. chuck the short end into the drill chuck. set the drill on a workbench with the chuck hanging off the edge a bit. Hit down on the allen wrench with a hammer ( counter clockwise) and the chuck will unscrew normal thread.
You most likely have a loose connection inside somewhere, when you turn the drill to another position it creates a gap in the connection, therefore breaking the circuit.
Test the brushes by catching it in a stalled condition when you have it triggered, then rotate it slightly. If it takes off suspect the brushes or a dead segment on the comutator.
If it doesn't respond to this, then consider the VSR trigger... open it and test by bypassing it when in stalled condition...
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