D1-3 cam lock too tight

[Dabbler]

To be sure we are talking about the same thing here is one from Dewalt, but they are made by everybody:

 

[Dabbler]

It is meant for something like "DEWALT 20V MAX XR Cordless Brushless Impact Driver DCF887B" pictured below:



To be clear - if you use a regular "impact wrench" you will be at much higher risk of messing the chuck up.

 

[ddickey]

Tighten the other two and see if that helps.

 

[miklud]

Ddickey's suggestion