Bosch 1/2" Hammer Drill - Keyless Chuck?

[stagebuilder]

Hello, I bought a used but in good shape Bosch 1/2" hammer drill. I was thinking of changing the regular keyed chuck for a keyless one for ease of bit changing. I was wondering if this is a good idea or not? Does the hammer motion make the keyless chuck become loose?

[trydntru]

If you decide to do it, don't scrimp on the chuck. The addage you get what you pay for, directly applies here. The first one I replaced I went cheap and I paid for it. Now I buy genuine Jacobs brand chucks and haven't had a problem since.