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The chuck takes the brunt of the impact force. Over thousands of bit changes, the internal locking mechanism can loosen or fail to hold bits securely.

Clean the tool exterior with a wire brush or compressed air to keep debris out of the gear casing. Step 2: Stripping the Chuck Front End Use a small pick to remove the rubber front nose cap. hilti+sid+4+a22+parts+diagram

Hilti does not typically publish full exploded views in the user manual. To get the official parts diagram: The chuck takes the brunt of the impact force

The outer plastic/metal collar you pull to release a bit. hilti+sid+4+a22+parts+diagram