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If it is jammed then hold the bit in a vice and try to knock the chuck off with a cold chisel or suitable piece of brass. then you can remove the chuck screw and replace the chuck. You should not be able to see the bearings underneath.
You don't say if there is something in the chuck or if it is empty. If there is a bit in the chuck try holding the bit in a vice and gently tap the chuck off, you will probably find it ok then. Give it a quick spray with wd40.
If there is nothing in the chuck check that the left hand screw in the center of the chuck has not become unscrewed and screw it back in (Anticlockwise) it can jam the jaws.
If screw is ok then try spraying inside with wd40 and use a pair of grips or a wrench to free it.
If all else fails take it to a repair agent. You don't sat which model it is but there is one version that has and will only take a very expensive chuck so get a quote first. \it might just need a strong pair of hands.
If a large enough drill bit is inserted too far so it bottoms in the chuck, the jaws run into the bottomed shank and will not close beyond a certain point due to the interference. If you hold the drill bit out about 1/2 inch from the bottom, the jaws should close on the bit. I assume you have tested the chuck without a bit to verify they can close.
If this is a TE7 then the chuck will just pop off of the front end. You just pull the rear chuck sleeve foward to release the chuck. With the chuck off run the drill to see if the cylinder is bent. If you bent the cylinder it will wobble. If the cylinder is okay just order a new chuck. If the cylinder is bent then your best choice is to send it to Hilti and have it repaired by them. They have a ceiling on the amount the repair would be and you would get a warranty with the repair. It would be cheaper than you trying to buy the cylinder and replacing it yourself. Hilti 1-800-879-8000
You should only need to push the bit in. If that does not work grasp the chuck and pull back towards the handle than insert the bit and release the chuck. You remove the bit by doing the same pulling the chuck back and taking the bit out
If it won't fall out with the chuck fully open, you'll have to remove the chuck. use an allen wrench larger than the jammed bit and lock it into the chuck. Hit the allen wrench with a soft hammer to loosen the chuck. Remove chuck completely and push the bit out from the bottom.
That can happen if the jaws inside the chuck, usually 3 triangular pieces get jammed together. With chuck facing down tap chuck several times to loosen jaws. If that doesn't work spray a small amount of WD-40 into chuck and try again
wrap cloth or something around chuck to protect it a bit and using multi grips try to free up .if chuck is faulty youll need to get to left hand screw down inside the chuck to remove it. good luck some are very tight.
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