I tried to take a keyed chuck out a bosh drill and replace it with a keyless chuck. When i opened the keyed chuck jaws. There was no screw at the bottom inside. The keyless chuck had a screw at the bottom inside the chuck when it was opened. I could have taken the keyless chuck out but I didn't know how to take the keyed chuck out with it having no screw. How do u take chucks out with no screw at the bottom and its it possible to replace it with a keyless chuck with a screw at the bottom.
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Re: drill chuck swap
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.
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the screw at the base of the fully opened chuck is a left hand thread
it may be a slot but normally they are philips head or hex head undo that screw by turning as if doing it up
once it is out , hold the shaft and by placing something across the now partially open jaws a quick hit on that object with a hammer will loosen the chuck off the shaft you can place a allen key in the jaws and close them up and use that as an object to hit
open the chuck jaws right up
down the center of the chuck you will see either a philips screw head or a hex head for allen key
hold the shaft at the base of the chuck to stop it from turning and undo the screw in the chuck in a right hand direction ( it is a left hand thread) when you have that out , still holding the shaft turn the chuck in the left hand direction ( normal thread ) and screw the chuck off
to assist in undoing the chuck do it up so that the jaws come out a bit
place something between the 3 jaws to act as a lever or use an allen key in the chuck done it tight and use that as a lever to undo the chuck
the secret is the lh thread screw in side the chuck which stops it from undoing when the drill is in reverse
Open the chuck up fully, and in the bottom there is a reverse threaded lock screw that needs to be removed. (drill it out if you have to, it can be really hard to retrieve). Insert an allen key into the jaws of the chuck and hit the handle with a hammer to turn the hole chuck anti clockwise, firmly and quickly. Replacement is reverse but not so dramatic. Sometimes the chuck is damaged in such a way that it will not grip an (large) allen key sufficiently. You can then peel of all plastic parts of the chuck to expose the core. From here you can weld a metal pice to the chuck in place of an allen key. Take care not to damage the threaded axle from the gear.
If the chuck will open far enough, reach in with a screwdriver and remove the retaining screw. If a key type, insert the key and tap the key in a CCW direction to loosen. If a keyless type, use 'Channel-lock' pliers and tap them lightly in a CCW direction. Reverse the operation with the new chuck. Good luck!
you have three jaws in your chuck, one of them will probably have a small burr on it causing it to stick.
tap the chuck with a small hammer then try to use the chuck key gently in the opposite key hole to the hammer blows. turn chuck though 120degrees and repeat.
if this does not work chucks are fairly universal and easily replaced (i would recommend a keyless jacobs). you can get the old one off by removing the ph2 (phillips) machine screw inside the centre of the chuck... be careful!! this screw is usually soft and counter threaded... when screw removed bash off the chuck with a hammer and cold chisel...
open jaws for large size bit.look in bottom and there will be a screw slot or phillips head screw or possibly an allen head screw.remove this,by possibly turning clockwise. and then chuck up a large allen wrench. try removing the chuck by tapping wrench with hammer. this may be threaded on counterclockwise.have to try both ways.