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Squirt a little release oil(WD40 type) on the other part of the jaws and the inner of the chuck.then push the forward /reverse switch to the Arrow pointing forward(toward the chuck) then holding the chuck with the drill in No1 speed gentle pull the trigger until the jaws release and move all the way to fully closed.After this the drill should work properly.
This is caused by tightening the chuck using the drills power, if you clamp the bit in a vice and using a pair of multi grips on the chuck in an anti clockwise direction gently bounce the grips and after a few tries it will undo, don't use too much pressure or try to unwind it in one move or myou will damage the chuck sleeve
If your Makita matches the one on the picture, you will need a chuck key to attach a drill bit or tool to the machine's chuck. The chuck key inserts to any of the small holes in the front part of the chuck and at the same time its teeth interlocks with the teeth of the chuck. When turning the chuck key you will widen or loosen the grip of the three jaw pieces, that clamps to your tool or bit. Tighten the chuck key by hand until the chuck grips the bit securely. For safety, unplug the power cord whenever operating the chuck key on the chuck.
The chuck may have a left hand screw insde and at bottom of chuck, some chucks scew on and the screw holds it in place, may have to put an allen wrench in chuck and hit the wrench with hammer one way or the other to losen it.
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
open the chuck all the way, insde there may be a screw in the bottom it's lefthand thread turn it clockwise to remove, the chuck is also threaded, right hand thread. close the jaws on the short end of an allen wrench and strike the long end with a hammer to break it free
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