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.

How to Change a Drill Chuck: Keyless & Keyed Solutions

makita M3702 Trimmer Instruction Manual

How do I fix a stubborn drill chuck?

How to Remove a Seized, Stripped or Stuck Drill Chuck on a Makita Drill

Makita 3/8 in. Metal Keyless Chuck for Impact Driver 763198-1 - The Home Depot

Steady Turned Parts for Accurate Boring

Four-jaw lathe chuck with five-star value

How to Remove a Stuck Drill Chuck : 7 Steps - Instructables

General, Keyless Chuck Stuck

Makita M3702 trimmera lietošanas instrukcija