They make a service fixture for that BUT if you can find a thin wall open end wrench that will fit behind the chuck on the hex of the spindle you can still do it. What you will need to do is remove the left hand chuck retaining screw, put the wrench or similar item over the hex and then put the chuck key in a hole that is about a 30 degree so that you can strike it counter clockwise to remove. That chuck is on tight and there no easy way to remove it like you can do on cordless items.
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They make a service fixture for that BUT if you can find a thin wall open end wrench that will fit behind the chuck on the hex of the spindle you can still do it. What you will need to do is remove the left hand chuck retaining screw, put the wrench or similar item over the hex and then put the chuck key in a hole that is about a 30 degree so that you can strike it counter clockwise to remove. That chuck is on tight and there no easy way to remove it like you can do on cordless items.