I got the bolt/screw out of the end of the chuck but the chuck wont come off.
The chucks on these drills are put on not only VERY tight but usually with some lok-tite to boost so they don't come off easy. In my shop we usually lock a 1/2" hex driver in the chuck and use a 1/2" impact wrench to knock them loose. It usually takes a few seconds to come loose. Another method is to lock the short end of a 1/2" allen wrench in the chuck so that it sticks straight up with the drill standing up. Then lay the drill on its side with the top at the edge of your bench and the allen wrench sticking over the side of the bench. NOTE: The chuck follows the lefty-loosey, righty-tighty rule, the chuck screw is reverse thread. Have someone firmly hold the drill and then hit the end of the allen wrench until the chuck comes loose. Once you break it free it will spin off easily. You do need to put the new one on with lok-tite and as tight as you possibly can then lok-tite the screw and tighten it as much as you can by hand.
SOURCE: how to change chuck on a macallister 18v cordless
Hello. The shaft is tapered. Here is a video to show u exactly what to do. http://www.youtube.com/watch?v=usC8unA5RiA
Testimonial: "many thanks, after watching the video it look easy."
SOURCE: Jaws of my Hitachi 18V cordless drill are locked shut
Other than two quick squirts of WD40 and nice new chuck key?
Remove the REVERSE-THREAD screw at the bottom of the chuck. Set the clutch collar to the highest setting, and set the gear to the slowest setting on the transmission. Remove the power source! Get the biggest allen wrench you can fit in the end of the chuck(the shortest leg) and tighten the chuck down around it, allowing the jaws to rest and tighten on the flats of the wrench. Lay the drill on its side(chuck toward you, handle to the left, and allen wrench to the left, horizontal to the deck. Then with a hammer(soft hammer if you care about the allen wrench) quickly and deliberately hit the allen wrench in an attempt to cause the allen wrench to spin counter clockwise. Let me know if this works for you!
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this question is specific to the 18v RIDGID cordless drill/driver
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