Bosch Hammer drill. When drilling, the bit hit a rebar and feels like it permanently warped the chuck. Is this possible, or did the motor shaft bend? the motor runs fine, but the bit does not run true. thanks, Mark

Can not see what model you have. Is it a keyless chuck or an SDS chuck? With a keyless chuck hold the machine in a vice by the drill bit. now tap the chuck with a hammer or pin punch & hammer. DONOT hit the chuck on the jaws gut on the rim around them. I have had success using this method. If it is an SDS type chuck pull the chuck cap up as far as possible along the bit them if there are any ring springs you will have to try remove them then slide the sleeve up the bit, now you should be able to remove any steel balls. If the bit does not come out now hold bit in vice as before and tap on tool holder.

It is a spring loaded hammer drill. You need to push the chuck down just a bit for it to engage the clutch. If it is still slipping then either the clutch pieces (items 23 and 32) are worn or item 32 is spinning freely on the spindle shaft. Here is a parts diagram.

Bosch CSB470-RLE diagram

some drill bits have a certain way to be installed,if not put in correctly it will loosten up

open the jaws of the chuck up all the way. There is a retaining screw at the bottom ( under where the drill bit would go). this screw is reverse thread. once the screw is out, get a 3/8 inch allen wrench. chuck the short end into the drill chuck. set the drill on a workbench with the chuck hanging off the edge a bit. Hit down on the allen wrench with a hammer ( counter clockwise) and the chuck will unscrew normal thread.

Hello. Wrap a towel around the chuck and use a pipe wrench or a pair of channel locks to put a little force on the chuck. J.

Hit a metal part of the clamp chuck to just create a "shock" using a hard rubber-hammer (or a metal hammer if the rubber one fails) one or two times. Chuck grip will loosen on the bit for you to remove it.

I have a Skill 717, too. It has a hex shank. Here are a couple places that I've located that carry (some) parts:
www.icscuttingtools.com (pages 155 & 157)
www.bamanufacturing.com/page_15.htm

also try:
www.ereplacementparts.com
www.toolpartsdirect.com

Grasp chuck, reverse it until fully open. Look inside where bit goes and should be an allen head or torque head screw holding chuck to motor arbor/shaft.

grind bits shank in a triangle to let the drill chuck get a better hold of bit but be carfule because this also takes away the drills ability to slip if it hits something solid.

Put the screw back in the chuck, tighten it up then back it out 1 turn. Take a punch, put it in the chuck and give it a quick hit with a hammer. That should do the trick.