The job
- Upper burr: removes by hand for cleaning; replacement is a drop-in
- Lower burr: unscrew the retaining hardware under the burr chamber after emptying and vacuuming out grounds
- Order parts by machine model; Breville spares are stocked by their service network and mainstream parts sellers
Diagnose before replacing
Home burrs dull over years, not months. If grind quality dropped suddenly, look for a foreign object nick, packed-in oils needing a deep clean, or the adjustment collar skipping, all more common than genuinely worn burrs. Powdery, inconsistent output after heavy long-term use is the true wear signature.
Value math
Burr parts cost a small fraction of a new grinder, so refreshing a liked machine is easy to justify. If you are eyeing the swap as a performance upgrade rather than a repair, temper expectations: same geometry means same grind character, just sharpened.
Making the lower burr job painless
The lower burr removal is where this job goes sideways, so borrow the community's habits: work over a tray so small screws cannot vanish, photograph each stage before undoing it, and keep hardware laid out in removal order. A magnetized screwdriver earns its keep here.
Vacuum and brush the chamber thoroughly before touching fasteners; grounds packed around screw heads are what strip drivers. Note how the burr seats before lifting it out, and reinstall with the chamber spotless, since grounds trapped under a burr seat translate into wobble and inconsistent grinding. Tighten the retaining hardware evenly and snugly rather than aggressively; the surrounding parts do not reward force.
Habits that stretch burr life
Burr wear is mostly a function of what passes through the burrs. The fastest killer is a stone or stray debris hiding in the beans, so pour beans in gradually enough to spot intruders. Heavily oiled dark roasts do not dull the steel, but they cake the chamber and clog the cutting geometry with residue, which imitates wear; regular brush-outs keep the edges actually cutting.
Skip grinding anything that is not coffee. The occasional online tip about running rice through to clean the burrs is frowned on by manufacturers for a reason; purpose-made grinder cleaning pellets exist and do not gamble the motor or the burr set to save a few dollars.