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It sounds to me like the clutch is set to a low setting. Its the dial just behind the chuck with the numbers on it, you can turn it to adjust how easily the drill slips, the purpose of it is to make it easy not to strip screws or drive them in too far. Just turn it to a higher number or all the way and it should work fine. The setting its on is whichever number is on top of the drill (opposite the handle), there should be a little arrow on the body of the drill pointing to it. The highest setting will not be a number but an image of a drill bit, in this setting it will not slip at all. Some of these drills are also hammer drills (as the drill turns, the chuck will also "hammer" in the direction your drilling, this is for drilling into concrete and things like that and requires a special bit (if your drill has that there will be an image of a little hammer on the dial next to the image of the drill bit). I hope that helps, Good luck.
Open the chuck and remove the screw inside the chuck (if fitted) the screw is left hand thread, fit the short end of the largest hex key that will fit into the chuck and tighten the chuck, put the drill into low gear and turn the clutch to the drill position, support the drill on a bench and strike the long end of the hex key with a firm blow (right hand thread) it may be neccessary to strike it more than once
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.
There is suppose to be a flat head Left hand thread chuck screw in there. It may have fallen out. You will not be able to put the jaws back into the chuck. You will have to replace the chuck with a new one. If you make sure that the chuck screw is not there you can remove the chuck with a couple of steps. Make sure the drill is in it's lowest gear. Use a strap wrench or some large vise grips on the chuck. If there is still one jaw in the chuck make sure it is all the way open and locking the collar to the chuck. The chuck will come off in the regular lefty loosey configuration. It may be stubborn. If this is the case, You may have to cut the collar off the chuck and use a pipe wrench. Or bring it to a professional to get it changed out.
look inside the chuck for a screw. it will be a left handed screw.once you get the screw out put the chuck in a vice . you will need to squeeze it very tight. then put the drill in reverse and pull the trigger.if i wont come off you will need to hit the chuck with a hammer while you are holding the trigger.
K what you need to do is remove the chuck retaining screw LH threads and then switch the gear selector to low and the clutch to drill only. Find a bent handle allen wrench about the chuck capacity and lock it in the jaws. put the chuck on a workbench or block of wood and on the long part of the wrench have it at about a 30 degree angle and strike it counter clockwise and that should remove it. you might have to hit it a couple times
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.)
Are you sure you do not have a tourque adjustment problem. If not I do not believe Makita will want to send you parts,you would have to know what is precisely wrong and by the time you went back and forth you might as well find nearest dealer for repairs and google search Makita.com for service parts near you + zip code to get your drill fixed.