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You can try clicking on my name and then my profile and on the left hand side under tips is the written instructions. Let me know if this doesn't work and I will reprint.
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You have to remove the striker bolt from inside the spindle first. to do this remove the internal circlip (not always easy) then you can tap the striker bolt out and then press the broken bit out.
To remove the chuck, unscrew the 4 screws that hold the chuck housing to the body of the drill. Put the chuck housing in a vise & remove the bearing retainer... it has a left hand thread, so righty loosey. Once the bearing retainer is out, the chuck slides out of the housing. Don't waste time looking for a screw because there isn't one.
Dont know about a Makita, but my Craftsman drill , if you open the chuck all the way and look inside the hole where the bit goes, there;s a screw there that you can use to remove the chuck. amybe yours is the same way.
I think you will find that if you open the chuck fully you will see a cross head screw inside the chuck which you need to undo before removing the chuck. this secure the chuck from unscrewing while being used in reverse to undo screws. Once this screw is out a spanner is used at the base of the chuck to unscrew it from the shaft. this may need a short sharpe shock to get it to move.
Put the biggest hex key you have in the chuck and tighten it then hit it clockwise with the spindle lock engaged a couple of times. The screw in the chuck will then undo clockwise and the chuck can be undone after by putting the allen key back in and unscrewing it anti-clockwise maybe with a light tap from a mallet.
Hope this helps
Jon
There is a left handed screw down at the bottom of the chuck. I believe it is a flathead screw. You need to make sure you are in the lowest gear and turn that screw clockwise. It seems odd, but turning to the right will loosen the chuck screw. Once the chuck screw is removed then you need to remove the chuck from the spindle. Remove the chuck like a regular screw. It has regular threads and should be removed by turning it counterclockwise. Good luck
Place drill in vice with chuck in vice facing up . Clamp chuck lightly but with enough force to hold firmly. put allen wrench in chuck and lightly tap down to make good fit to allen screw head.Clamp chuck jaws down onto allen wrench lightly to hold wrench steady. Take piece of pipe to end of wrench,10". These chuck screws are tight. Hammer clockwise until screw brakes loose.Open chuck completely and remove screw.Chuck is threaded to spindle shaft . Place allen wrench with long end facing out of tool in chuck and tighten chuck securely. With hammer tap allen wrench sharply counter clockwise ( normal thread.)
First open the chuck jaws and remove the LH chuck retaining screw. After that find a bent handle allen wrench about the size of the chuck. Put the shorter end in the chuck and clamp down on it. Put chuck on a block of wood or workbench with the long end at about a 30 degree angle so you can hit it counterclockwise with a hammer. It might take a couple hits but it will come off.
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