I purchased a new housing for my DeWalt 18 volt drill. i.e. the 2 main halves that screw together and once they are together its the area you wrap your hand around....hope it makes sense so far.
So all went well until a very small part fell out. I believe it is a spring that puts tension on the switch at the top of the drill where you go from a No. 1 setting to a No. 2 setting. Without that part in place I can't get the switch to properly engage. So the question is how exactly does that small part get installed.
Any help would make me look good in my wife's eyes.
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You need to get a new transmission. There is a spring and pin that get worn in the transmission. Dewalt doesn't sell just the spring and pin. You will have to get the whole transmission. The part number for the transmission is 397892-05 for the dc980. To change it you undo the screws holding the housing together. (Make sure battery is removed first.) Undo 4 screws holding front assy on and remove. Undo back cap screws and remove. Pull the right side cover off and leave drill seated on bench. Do not pull entire assy out of left handle. slightly angle the motor transmission assy and slide transmission off. Replace with new transmission. (Lining up teeth is not easy but keep at it until you get it.) Replace motor and transmission assy and reassemble in the reverse order above.
Some cordless Dewalt drills do not have open motors allowing access to the brushes. However there are a few styles that do.
If you want to check, open your drill. Remove the screws from the housing. Then remove half of the housing. You can see the motor at the back of the tool. If there are vents at the back of the motor you may be able to see the brushes the removable type are connected to a gray or tan piece of plastic mounted at the back of the motor.
If the brushes are from a removable style you can purchase a brush set. If they are hidden in the motor. You will have to change the whole motor.
You can check the Dewalt Service Net web site to find out.
Had the same problem on mine. Remove the chuck, then remove the snap ring on the back of the chuck( carefull, the housing will fall out once the ring is removed), on the side of the chuck you'll find a cam and small odd shaped spring held in by two cylender pins, on mine the spring had a gap in it and I just spread the gap to about twice the size in was and put everything back together and it has worked fine ever sence. Hope it works for you.