Help replacing Bosch Chuck assembly

[778720]

I have a Bosch hammer drill (Model 1199VSR) and do not know how to remove the chuck assembly. I have a new assembly and can see it threads onto the drill body. I can't tell if it threads 'on' in a clockwise or counter-clockwise rotation.

I also see there is a small hole on the drill body near the chuck, if I rotate the old chuck a corresponding hole appears in the shaft of the chuck. Is this to 'lock' the drill armature so the chuck can be removed; if so is there anything in particular I should insert or just something of similar diameter.

[WJA]

Hello,

We have an article and video demonstrating how to remove a drill chuck. Here is the link.

Removing a Drill Chuck.

Hope this helps,
WJA