Coin Mechanisms: Jam, Sorter and Hopper Maintenance That Prevents Downtime

Coin handling looks mechanically simple, which is why operators under-maintain it. The three failure families below account for most coin-path downtime.

Slug and foreign-object rejects

• Washer-shaped slugs fool thickness gates but trip weight checks — they accumulate in reject trays. Coin weight tolerances that “legal tender” implies are defined in official weights-and-measures guidance from bodies such as NIST; a sorter that accepts out-of-tolerance pieces is a calibration symptom, not a mystery.
• Clear the sensing gate weekly with dry air; a film of coin dust changes both weight and diameter readings.

Sorting divergence

Denomination sorters rely on calibrated gates. When one diameter starts mis-sorting, check gate wear and fastener position before blaming electronics — mechanical drift is more common than board failure.

Hopper payout miscounts

• Bent coins jam the gate; run a manual rotate to find the sticky piece after every miscount.
• Worn payout sensors double-count thin coins — clean the sensor window and verify the shutter closes fully.

The thirty-second weekly routine

1. Empty and inspect reject and cashout trays for foreign objects.
2. Air-blast the gate and sensor windows.
3. Rotate the hopper by hand and listen for scraping.

Keep one spare gate assembly and sensor set on the shelf; both are inexpensive, and running out turns a five-minute fix into a weekend outage. The coin path shares its failure drivers with the whole cabinet — read the environment-control guide and fold both into the preventive calendar; more cash-handling upkeep lives in the RMG Knowledge Base.