Model Numbers
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Chuck Removal
How can I remove the chuck on my dewalt drill model # DC759
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The chuck replacement process is relatively simple. We have a full walkthrough on our site (including a video) that applies to most keyless chucks. You'll want to check the "Threaded-on" section of our article here:
http://www.ereplacementparts.com/article/890/Removing_a_Drill_Chuck.html
You'll need to start by removing the chuck screw, which is left-handed (meaning you'll have to turn it clockwise to loosen it), then put the biggest allen wrench you can fit into chuck. Tighten the chuck around the allen wrench, and secure the drill (preferably in a vise) before hitting that allen wrench counter-clockwise with a hammer a few times to get it loose. After that, you should be able to get the chuck off by hand.
The whole thing should hopefully take no more than a few minutes.
Our article will have any details I may have missed, and the video has been pretty helpful to a lot of people, so I'd still recommend referring to it before starting this project.
Parts Breakdowns on eReplacementParts.com