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how can i open the chuck?

the chuck will not release the drill bit
the drill is a dewalt dc757 with a 13mm chuck
stephen hill, April 2009
Hit the side of the chuck a glancing blow in the normal release direction with a small hammer.... do it gently but deliberately, a squirt of wd 40 or similar into the chuck may help

colin, April 2009
link Click here to see other fixes for DeWalt DC757.