I have a dewalt dcd997 20v hammer drill, and the chuck is stuck at full open position. Common tricks to tap with hammer etc. have
failed. I need to know what parts I need to repair/replace (chuck only? gearcase assembly? although chucks are normally removable,
after searching on web I'm unclear if the chuck) is easily removable on this model) ..... and instructions or video how to replace what's
needed. Repair instructions are notably absent on Dewalt's website(s), and reaching a tech has proved impossible.