Something similar happened to a bosch I owned. I blew out the concrete dust in the release mechanism with a compressor and sprayed some wd40. It works fine now. Makes me want to buy that milwaukee dust shroud system.curapa said:Anyone have any experience with a sds chuck being stuck? It was working fine earlier today but when I went to roll up today the chuck would not move to allow the bit to come out. I tried the old hammer tap on the chuck but had no success.