How do I fix a stubborn drill chuck?

Recently I bought a used drill press at an auction. Everything works great except the chuck—it’s stiff and difficult to turn without using the chuck key, especially when cold.

tools - Remove stubborn drill press chuck - Home Improvement Stack Exchange

Ronix 2112AV 110v, 450W 10mm Keyless Chuck Electric Drill

Tips and tricks using your drill press

Drill without damage

Makita M3702 trimmera lietošanas instrukcija

Drill bit stuck behind chuck - Home Improvement Stack Exchange

Buy drill chucks online - fast & cheap for you

Eazypower 1/4 in. in. Keyless Chuck Adapter 1/4 in. Hex Shank 1 pc - Ace Hardware

How to Remove a Stuck Drill Bit From Almost Anything - A Butterfly House