High hours, early wear
Shared-laundry dryers run many more hours than household machines, so their wear parts announce themselves sooner. A rhythmic squeal or rumble on this equipment is usually the drum support or the belt idler, and the most useful thing a user can do is describe when the noise happens.
What you are seeing
- A rhythmic squeal that follows the drum turning.
- A rumble that gets louder as the load gets heavier.
- A metallic scraping from inside the drum.
- A thumping that follows every drum rotation.
- A rattle that stops when the machine is empty.
- Not this fault: A machine that hums but does not turn is a start fault - read that page.
- Not this fault: A machine that tumbles quietly and does not dry is a drying fault.
Most likely causes, in Direct Supply order
- Drum rollers or glides worn — Why ranked: First on high-hour equipment. A rumble that increases with load and follows the drum is the classic sign.
- Belt or idler pulley worn — Why ranked: Second: a rhythmic squeal in time with the drum, usually worse from cold, points here.
- An object caught between the drum and the bulkhead — Why ranked: Third. Coins, buttons and pen clips get through in a shared laundry constantly, and the scrape follows the drum exactly.
- Blower wheel damaged or fouled with lint — Why ranked: Fourth. It gives a rattle or a whirring that changes with airflow rather than with the drum.
- Motor bearing worn — Why ranked: Last, and identified by a noise that continues even with the belt load removed by a technician.
What to check, in order
- Note whether the noise follows the drum turning or the airflow. — Because: Drum-linked sounds are rollers, glides and belts; airflow-linked sounds are the blower.
- Run the machine empty and compare with a loaded run. — Because: A rumble that rises with load points at the drum supports.
- Listen for whether the squeal is worse at the start of a cycle. — Because: Belts and idlers are noisiest cold and quieten as they warm, which is a very distinctive pattern.
- Check the drum interior and the gap at the front for trapped objects. — Because: Shared laundries feed coins and buttons into machines constantly.
Checks you can do safely
- Run the machine empty and listen, then run it loaded and compare. — N: 1 — Tools: None — Time: one cycle
- Look inside the drum and around its front edge for trapped objects. — N: 2 — Tools: Torch — Time: quick
- Note whether the noise is worse cold or unchanged throughout. — N: 3 — Tools: Notepad — Time: one cycle
- Check the lint screen area for a damaged screen or debris. — N: 4 — Tools: Torch — Time: quick
- Report the noise with its timing description through the facility route. — N: 5 — Tools: None — Time: quick
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. Never reach into a drum that is still turning, and never run a machine with a panel removed to listen to it. Report a machine that has begun to scrape rather than continuing to use it. Never remove a lint screen to investigate a noise. Do not attempt belt or roller work on shared equipment; it is a technician job.
When this becomes a service call
A metallic scraping or grinding from inside the drum. A rumble that has grown noticeably over a short period. A noise together with a burning smell. The drum turns unevenly or stops turning under load.
What this page does not cover
This page covers Direct Supply dryers as installed in shared community laundry rooms. It does not cover in-room compact and ventless dryers in resident apartments, whose mechanisms differ, and it names no model-specific roller, belt or blower part. Where a family- or model-specific page exists it supersedes this one.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
