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 if this drill has a 2 speed transmission. Remove the battery! I have performed this with the battery in back in my noob days, and getting an allen wrench in your rib because you accidently hit the trigger will only happen once. You will never forget that experience. 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. You have only a few to several attempts at this before you risk damaging the clutch, so make the first one count. Follow through like you are attempting to hit something 6" below the allen wrench. If this does not do the trick before you shell the clutch/gearbox, you are looking at an expensive undertaking, most likely a new drill. I have only shelled 2 clutches out of literally tens of thousands of chuck repairs, so don't worry, just be aware. Let me know how it goes!
SOURCE: porter cable 884 cordless drill
Most chucks have a tolerance the cordless drills where designed for drill bits 1/8 and larger the 3/8 chucks are a little better with the smaller bits .Check your owners manual and see if they have a min requirement listed for the bit size
SOURCE: changing a drill chuck
If this is a cordless drill open chuck jaws and remove the retaining screw (LH trheads), switch the clutch to drill only and shift gear selector to low. Insert a bent handle allen wrench about the same size as chuck (to keep from flexing) put chuck on workbench or block of wood and have the wrench about 30 degrees and strike the key counterclockwise to remove. You might have to hit a couple times but usually they will loosen up quickly. To install just reverse above. Let me know if I can help further.
Dave
SOURCE: how to onlock the keyless chuck of my cordless
if the chuck is rusted start with some WD-40 on the chuck body. Then what I would do is take a rag and wrap around the chuck collar and using a pair of channel locks grip the collar with enough pressure to hold but not break it and using the tool in the low position pull the trigger switch SLOWLY and see if that doesn't free up the chuck. Let me know if still stuck and I will come up with something else, but this usually works for me.
SOURCE: Cordless Drill, Keyless Chuck stuck in full open position.
if chuck is wide open ,look down inside there should be an allen screw or bolt at the bottom of the chuck it should undo anti clocwise and the chuck comes off
SOURCE: relace keyless chuck
It really depends on the model. Here is a general description of how to remove most regular keyed and keyless chucks from corded and cordless drills:
Some chucks have a Left Handed screw that secures them to the spindle so they do not come loose. You can look into the chuck with a flashlight and see if there is a chuck screw. (It may be a torx head, flat head, or philips head) You will need to remove this screw first before doing anything else. Sometimes there is loc-tite applied to the screw so it may be stubborn and sometimes you will strip the screw head. Remeber that the old saying lefty-loosey, righty-tighty does not apply here. Left is actually tightening a left hand thread, so you want to turn it right to loosen. I know, it will feel weird but thats the way to loosen it. You may have to apply some heat to the screw in order to get that loc-tite to break. A pencil torch works great. If you strip the head out you will have to use a drill press and drill the screw head off.
After removing the screw you can remove the chuck.
To remove the chuck, the easiest way is to use a hex socket bit and an impact wrench. Put the hex bit in the chuck, and depending on the condition of the jaws, tighten the jaws as much as possible to the hex bit. Put the impact in reverse and bump it until the chuck is loosened. If you do not have access to an impact wrench you will need to put a hex key with a long arm into the chuck and tighten it then place the drill on the edge of your bench and give it a good whack with a 3lb hammer. It may not come off immediately so you may have to reset and do this a couple of times. Not the most effective way to remove a chuck, especially if one of the jaws is missing, but that is what most manufacturers tell you to do. I myself cut the collar off with a die grinder and then use a pipe wrench on the body of the chuck applying constant pressure while heating the chuck body with a torch. Works every time. Heat is our friend on stubborn chucks. Good luck, any questions please post.
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