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if its a reversible drill there will be a screw in the bottom of the chuck, open the jaws as far as they will go and you should see a screw head, it is a left hand thread so put the drill in low speed selector this will stop chuck turning as easily, then turn screw clockwise as your looking at the chuck, when its out put an allen key in and tighten up the chuck hit with hammer now in a anti clockwise direction it should unscrew. repeat in the reverse procedure to fit new chuck....
I would suggest that you go to Makitatools.com and type in your model number and look at the breakdown for complete disassembly procedures. The only problem it could be it the tab on the switch or the shift lever is broken I would have to think it is the switch. Let me know if I can help more.
I would suggest going to the Makita site and downloading a breakdown for this tool first. The switch replacement is not that difficult to do. If you are comfortable with taking the tool apart to look for debris (possibly pieces of fan) that would restrict movement. Sometimes if it breaks pieces get behing the trigger and won't allow it to shift, if it is broken you need a new motor. Pay close atttention to the wiring it is polarity sensitive and if nott rewired correctly will burn up a new switch. Hope this helps but like I said it is not that a major repair if you just take your time and watch how things come apart.