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The chuck might have debris in the jaws, which could make adjusting the chuck harder or stiff.
Open the chuck fully and clean out any build-up of dirt and dust - preferably with compressed air.
This can be done by blowing compressed air (either from a can of compressed air or an air compressor) into the open chuck around the internal jaws until build up is removed.
You can also use a small pipe cleaner (cylindrical brush) to clean the debris.
You may need to cycle open and closed the chuck jaws to loosen all the debris.
