SOURCE: makita 6408 drill motor. can't see how to replace the chuck.
If you have the 6408 as listed the spindle is threaded and you are correct there is no retaining screw. What you would need to do is find a bent handle allen wrench about the size of the chuck capacity 3/8" and insert the shorter end in the chuck and tighten. put the chuck on a block of wood or workbench and position the long end at about a 30 degree angle in the counter clockwise position and strike it with a hammer, this might take a couple hits. If this is not a 6408 let me know and I will look at the tool for you and see what you got.
SOURCE: keyless chuck is stuck with bit inside
Try two channel lock pliers.
Hold the bit close the the base with one.
Take the other (cloth comes in handy here to prevent marring) and turn the chuck counter clockwise to release.
Alternative (little WD40 on the chuck)
One channel lock plier hold the chuck and put the drill in reverse.
The WD40 should allow the chuck to release easier.
Good luck!
SOURCE: removing chuck from Makita 64C1 drill
secure the short end of an allen wrench in the chuck, making sure it is as tight as possoble. Useing a wood or hard rubber mallet strick the long end of the allen wrench so it turns counter-clockwise. This should loosen the chuck from the spindle enough that you can unscrew it by hand.
SOURCE: Broken Makita Drill 6408k chuck
If the chuck itself slips, you can tear down the outer layers (yes it is a bit brutal)
of the chuck until you reach the inner metal core. You can then try several things;
1 loosen it with a pipe wrench, provided you can get a grip on the axle of the chuck to counter the torque
2 Weld an allen key to the metal core of the chuck and use a firm rapid blow by a hammer to rotate it counterclockwise
3 Dismantle the final shaft with the chuck core, and set it in a vise with aluminium plates to protect it, while you turn the chuck with a wrench or pliers.
4.If there is no senter lock screw inside the bottom of the chuck it may be fitted with a thread locking compound. It will loosen easilier if heated with a heat gun or moderate gas heat.Only supply just enough heat to loosen it, or the hardening of the steel may be compromised.
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