There IS NOT a retaining screw inside the chuck on a 1199 VSR Bosch Hammer Drill. You must remove the perpendicular handle at the collar near the chuck. Underneath it, you will find a hole. Slide a pin punch into the hole. You will need to rotate the chuck until the hole on the spindle lines up with the hole in the housing. Once this happens, you will know because the punch will slide in further and seat. This locks the spindle into place. The chuck is threaded onto the spindle and at this point, securing the drill in a vice (carefully so as not to damage it or the hammer switch, or torque switch), insert a stout allen wrench into the chuck, tighten it, and strike the allen wrench with a hammer in a counter-clockwise fashion. My chuck was so torn up, I had to chisel the thin housing away from the base of the chuck and disassemble it and the tightening ring first. In my case, instead of using the allen wrench, I simple grasped it with a large pair of channel locks and turned it off. I WOULD NOT recommend using a keyless chuck for a replacement. Spend the $30-$40 and buy a quality replacement.
There IS NOT a retaining screw inside the chuck on a 1199 VSR Bosch Hammer Drill. You must remove the perpendicular handle at the collar near the chuck. Underneath it, you will find a hole. Slide a pin punch into the hole. You will need to rotate the chuck until the hole on the spindle lines up with the hole in the housing. Once this happens, you will know because the punch will slide in further and seat. This locks the spindle into place. The chuck is threaded onto the spindle and at this point, securing the drill in a vice (carefully so as not to damage it or the hammer switch, or torque switch), insert a stout allen wrench into the chuck, tighten it, and strike the allen wrench with a hammer in a counter-clockwise fashion. My chuck was so torn up, I had to chisel the thin housing away from the base of the chuck and disassemble it and the tightening ring first. In my case, instead of using the allen wrench, I simple grasped it with a large pair of channel locks and turned it off. I WOULD NOT recommend using a keyless chuck for a replacement. Spend the $30-$40 and buy a quality replacement.
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If there is a chuck bolt in the center (where the bit goes) remove it (left hand thread). The chuck is threaded onto the splindle(right hand thread). On some of those drills they have a small hole in the housing that lines up with a hole in the spindle. Put a pin punch in to lock the shaft so you can unthread the chuck. If you clamp a 3/8" allen wrench in the chuck it acts as a good handle. If there are no holes to lock the chuck, if you lay the drill on a bench and give the allen wrench a sharp blow with a rubber mallet it will unthread the chuck. If the chuck is damaged and will not hold an allen key you will have to cut the spindle off and replace the chuck and spindle.
Hope that helps
SOURCE: need to change chuck
When you buy a replacement chuck it will have detailed instructions- at least Jacob's brand chucks do. Basically there is a retaining screw inside the chuck that needs to come out first- it may be left-hand threads . Then you put the short end of a 1/4" or larger allen wrench in the chuck and close it tightly. Set the drill on a bench with the chuck off of the bench and strike the allen wrench with a mallet in a counterclockwise direction. Do this several times, then you'll be able to spin the chuck off by hand. Reverse the process to install the new chuck.
SOURCE: Bosch hammer drill 1199VSR chuck
some drill bits have a certain way to be installed,if not put in correctly it will loosten up
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