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There is supposed to be a Phillips head LH thread screw in the chuck. I have seen the screw head worn down so you can no longer get a screwdriver to work.
We usually cut the chuck off with a metal chop saw just at the screw - thread what remains of the chuck off, which usually leaves 1/4" of the screw sticking out of the spindle - remove with vise grips.
Its not an easy prospect when that happens.
Set the drill to reverse. Hold the chuck, press the trigger and open the drills chuck to it wide open position. Now,, take the correct size allen wrench and insert it into the back of the chuck to remove the screw. Turn the screw clockwise to remove it. Notice I said clockwise, just the opposite of what you might think. Hold the chuck with your hand or a pair of large vise grips and press the trigger to unscrew the chuck from the drill. Rotate it counterclockwise to remove it from the drill. Reverse the procedure to install the new chuck.
Use of both is the same:
- loosen "chuck" (part where bit is installed).
- insert bit (hand tighen chuck so that bit is secured)
- tighten chuck securely with chuck tool, or by holding rotating chuck with hand and pulling trigger (GENTLY or you will shave off skin!)
- put drill in forward or reverse mode and pull trigger to inser or remove screw / drill hole.
ensure that battery is charged on cordless drilll.
squeeze connectors to remove and place in charger when battery is too low to operate drill.
wrap cloth or something around chuck to protect it a bit and using multi grips try to free up .if chuck is faulty youll need to get to left hand screw down inside the chuck to remove it. good luck some are very tight.
You must remove the inner chuck retaining bolt first, it is a torx screw and is left hand thread. once you have this screw out, get yourself a 1/2" allen key (the L kind). Chuck the short end in the chuck to grip it, use a mallet to hit on the long end (this will unthread the chuck). The spindle thread is regular Right hand thread. It may take a few good hits to knock it loose but it will come off.