On 10/4/2015 1:44 PM, Mark wrote:
replying to adrian, Mark wrote:
adrian wrote:

Well, I already looked for a screw several times. If I open the chuck
up and look down with a flashlight I see a smooth metal surface at the
bottom. No slot, no recess for philips or allen wrench. I can look
again.
I'm in Northern Virginia. Which Milwaukee are you recommending? When
I read the amazon reviews of drills with keyless chucks there's always
people complaining that the chucks don't work, it seems, even for
Milwaukee's low end drill.
Note that in my case I suspect that the failure of my chuck was really
the result of abuse. The drill always worked fine until I remodeled
the bathroom. Then I used the drill to a dozen holes in ceramic tile.
Nothing would cut these tiles except diamonds. The diamond bit
required continuous water lubrication and it took 5-10 minutes PER
HOLE. The chuck rusted. It was light rust that was easy to remove
with a rust remover, but it was after that job that I started noticing
the chuck slipping.


I encountered this post when trying to find a way to remove the chuck from
my ancient DW106 drill. Adrian is correct -- there is no screw in this
model. I finally figured out that if I removed the seven Torx #10 screws
holding the drill together, I could separate the case halves, lift out the
gear, shaft and chuck, and lock a Visegrip onto the shaft between the
chuck and the first gear. Locking a 1/4" Allen wrench in the chuck and
turning the chuck counterclockwise with a few blows from a light hammer,
using the Visegrip to keep the shaft from turning, did the trick.
Reassembly was no problem at all. I wish I had done this to begin with and
that I could have shared this trick with Adrian when he encountered this
problem 9 years ago.

Typically screws are only used for reversing drills.
Anyway the standard procedure if it does not have a screw or after the
screw has been removed is to tighten the chuck, if possible, on to the
short end of a large hex wrench. Then whack the wrench with a hammer
counter clockwise if the wrench is between you and the drill, and or in
the same direction that the drill spins when drilling a hole.
I realize this is basically what you said but normally you can do this
with out taking the drill apart. The resistance of the motor and
gearing is normally enough to hold the chuck in a relatively stationary
position.

That said, I wonder if using an impact driver to loosen the chuck would
work better.