Dewalt cordless drill (18v) will not always engage when pulling the trigger. when it does, it moves very slow. sometimes it will begin rotating if you spin it manually w/ your hand.
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it sounds like you have a problem with the switch or battery. Try cleaning the battery contacts first and then remove the battery and look into the tool and see if the switch contacts are bent not allowing battery to seat firmly. If that is OK then I would think that you need a new switch. MAKE note of how you remove it because it is polarity sensitive. Let me know if you need more assistance.
Find a way to secure the chuck like in a vise. Then change the rotation of the drill and hit the trigger. Make sure you have a good grip on drill..good luck
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...
I have been rebuilding drills for 10 yrs and have installs hundreds of switches. This is not an issue in a switch like this. If it was, the energy from the motor working should damage the switch more than the static from your body. I would not be concern with it.
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