This drill has a 2-level chuck handle. one is slightly larger diameter, or is closer to drill body. It is fixed to the motor shaft. Smaller diameter, or forward one is the adjustment. Hold the rear/larger one stationary and twist the smaller/forward one as if you were opening a water bottle with a really tight lid.
SOURCE: chuckless drill stuck tight with drill bit in
if you trap the chuck in a bench vice or alike and then use the drill in reverse in short bursts until it loosens a good spray with wd40 will also aid the situation
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