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Here is the manual for your drill. It does show you how to remove the angle attachment and installing a straight chuck. Maybe when you install the straight chuck it is not positioned correctly. http://powertool.manualsonline.com/manuals/mfg/makita/da4000lr_1.html
The screw in the bottom of the chuck is reverse threaded (left tight, right loose). It is also lock-tited so will be hard to remove. Make sure you have a screw driver well seated in the screw and turn it backwards (clockwise) to break it free. Once that is out, lock the short end of an allen wrench (at least 3/8" to 1/2") in the chuck. You'll have to lay the drill on a bench with the long end of the allen wrench hanging over the edge so you can hit it with a hammer hard enough to break the chuch free from the anvil. The chuck is threaded left loose, right tight so hit the wrench to turn the chuck counter clockwise. When you replace the new chuck use a small drop of lock-tite on the anvil threads and screw if it doesn't have some on it already.
After removing the screw lock the short end of a 3/8" to 1/2" allen wrench in the chuck. Firmly hold the drill on the edge of a bench or lock it in a vice so you can strike the allen wrench hard and fast. The screw is reverse threaded but the chuck turns lefty loosy like a regular nut and bolt. It's the best and only way to break the chuck free.
I think the general procedure is to chuck something in at at a right
angle (an allen wrench, for instance) and then smack the free end with a
hammer or mallet to break the threads loose. BUT, you have to know FOR
CERTAIN if it is left-hand or right-hand threads.
They torque them on there so it won't fall off under hammer use, they never know what you will be doing so they don't take chances. You will have a tough time getting that thing off, why do you want it off anyway?
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.)
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
If this is a newer tool it is probably a Torx drive screw usually a T20. The screw is LH thread and after removing it you will need to put some screws back in tool to remove the chuck. First shift the gear selector to the low setting and the clutch to the drill only. Next get a bent handle allen wrench about the capacity of the chuck install the short end of wrench in chuck and tighten. Put the chuck on a block or wood or a workbench to support is and turn the wrench to about a 30 degree angle in the counterclockwise position. The chuck has standard threads so you want to hit the wrench with a hammer to loosen it. This might take a few tries but it will work. Good luck