Chuck jaws on Makita 8444D fell out

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.