I have a rotozip 20 and the new keyless chuck just does not work. Am I doung something wrong?

two pairs of multigrips
one on e chuck and the other on the bit that does the turning to tighten on the drill bit.

If a large enough drill bit is inserted too far so it bottoms in the chuck, the jaws run into the bottomed shank and will not close beyond a certain point due to the interference. If you hold the drill bit out about 1/2 inch from the bottom, the jaws should close on the bit. I assume you have tested the chuck without a bit to verify they can close.

Hi Tony,

To remove the bit with a keyless chuck, just turn the chuck to the right (looking from the handle to the front) to open the jaws. To put in another bit, tighten the chuck to the left to close. You have to use both hands. You will see where the ridged portion of the chuck is in two sections. Hold on to the back section with your left hand to keep it from turning while you turn the front section with your right hand.

A lot of the time I just push the button to put the drill in reverse, hold on the front section of the chuck and turn it on. It will loosen by itself. Then when you put the new bit in, put it in forward and hold on to the chuck and press the switch. The bit will be in nice and tight.

Good luck.

Please place a vote when you accept this solution.
Thanks,
Handie Andie

key less chucks are not the best .. You can get bits w/ squared sides .. or use channel locks to grab chuck & tighten better,,

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.

open the chuck and look in the center there is a screw allen type most times or a star screw in the middle that connects it to the drill shaft just tighten it up should work fine then!

Keyless chucks have two parts (see pictures) when the drill is in operation both parts spin. Assuming you put the drill bit in and tightened the keyless chuck by hand, put on a work glove and grasp the part of the chuck at the front of the drill, grasp the other part and twist the front part anti clockwise.
If this does not work you can hold the front of the chuck and reverse the direction of the motor as if you were unscrewing something, then pull the trigger. If your hand does not grasp the chuck tight enough it will slip, hence the glove. If this does not work you may have to hold the front of the chuck in a vice or with caliper pliers and again the pull the trigger with the drill in reverse.
All this depends on what you used to put the drill bit in with your hand tight or held onto it with something else. Whatever was used should be enough to loosen the chuck
Hope this helps.
If it does let fix ya know.
Cheers
Les

1. Turn the screw clockwise to take it out.
2. Then you needs 3/8 allen key & insert the short side of the allen key & tighten the chuck.
3. hold the drill at the edge of the table & wack the allen key
counter clockwise & do it again as needed.
4. dewalt keyless chuck will fit but you might add a washer to insure the chuck is not rubbing the clutch collar.
5. putting it back together the other way.

I had the locking screw come loose in the center and bottom of the chuck it has a left hand thread and is a torx head . It had backed out and prevented the chuck from closing.

hi this should be reletively easy hold the end black bit with the sivler bit holde coming out not the black bit next to the yellow case on drill you hold the black part thats at end of drill by where the bit goes into not the black bit near the trigger hope i explain this ok.
Hold this bit tight then put drill in reverse then press trigger a couple of times it might be tight but shouldnt be that tight it wont undo.
1 put in reverse
2 hold black plastic piece near where drill bit goes into
3 press trigger few times
4 this should undo it allowing you to put a bit in
make sure its in reverse else you will just tighten it up more let me know if you need further assistance ok