What Is the Drum of a Washing Machine
Quick answer: The drum is the cylinder inside a washing machine that holds your clothes and spins them to wash and to wring out water. Almost every washer actually has two drums: an inner drum — the perforated basket you load clothes into, which rotates — and an outer drum (or tub) — a sealed, watertight shell around it that holds the wash water and houses the bearing and seal. When people say “my washer drum won’t spin” or “the drum is loud,” they almost always mean the inner drum or the parts that turn it.
The drum is the heart of a washing machine — it’s where the actual washing happens, and it’s behind most of the noises and failures owners worry about. Understanding the two-drum design (and which one moves) makes it much easier to tell a normal sound from an expensive problem, and to know whether “the drum is broken” means a $150 belt or a repair that costs as much as a new machine.
The Two Drums, and What Each One Does
The inner drum — the part that moves
This is the basket you load your clothes into. It’s perforated with hundreds of small holes so water can flow in and out, and it’s lined with raised paddles (on front-loaders) or built around a central agitator or impeller (on top-loaders) that moves clothes through the water. The inner drum is the only part that spins: slowly to wash, then fast — often 1,000+ RPM — to fling water out of the fabric through those holes during the spin cycle.
The outer drum (tub) — the part that holds water
Surrounding the inner drum is a sealed, watertight outer tub. It doesn’t move. Its job is to hold the wash water and contain it while the inner drum spins inside. The outer tub is also where the drum bearing and seal live — the components that let the inner drum spin smoothly, and the ones responsible for the loudest, most expensive drum failures.
How the Drum Spins
The inner drum is turned by the motor, connected in one of two ways depending on the machine:
- Belt drive A rubber belt links the motor to the drum. Common on many top-loaders and older machines. When the drum stops turning but the motor hums, a worn or snapped belt is a frequent cause.
- Direct drive The motor connects straight to the drum with no belt. Common on modern front-loaders and many newer top-loaders — fewer moving parts, but when the bearing or motor fails it’s a bigger repair.
Riding on the shaft between the motor and the drum is the drum bearing, which lets it spin thousands of times per load with minimal friction. On front-loaders, the drum also mounts to a metal frame called the spider arm. These two parts are behind the drum problems that tip a washer toward replacement.
Common Drum Problems and What They Mean
| Symptom | Likely Cause | What It Means |
|---|---|---|
| Drum won’t spin or turn | Drive belt, motor, lid switch/door lock, or a drain fault | Often an affordable fix — a washer won’t spin until it drains |
| Loud grinding or rumbling on spin | Worn drum bearing | Gets worse over time; a labor-intensive repair |
| Banging or knocking (front-load) | Cracked spider arm | Corrosion-related; usually a repair-vs-replace decision |
| Drum loose or wobbling | Worn suspension springs/shocks or bearing | Can start as unbalanced loads, then become mechanical |
| Drum fills with water but won’t drain then spin | Drain pump or clog | Affordable, common repair |
| Musty smell in the drum (front-load) | Mold in the door gasket and drum | Maintenance, not a failure |
Drum Won’t Spin or Making Noise?
A drum that won’t turn is often a belt or drain fix; a grinding drum is usually the bearing. We diagnose which before recommending anything — the $99 diagnostic applies to the repair.
Book a Diagnostic Washer RepairTop-Load vs. Front-Load Drums
The biggest difference between washer types is how the drum is oriented and what moves the clothes:
Top-load drum (vertical)
The drum sits upright and spins on a vertical axis. Clothes are moved by a central agitator (a tall finned spindle) or a low-profile impeller. Water fills the tub and clothes are submerged.
Front-load drum (horizontal)
The drum lies on its side and spins on a horizontal axis. Instead of an agitator, raised paddles lift the clothes and drop them through a smaller amount of water — more efficient, but the horizontal drum puts more load on the bearing and spider arm, which is why those failures show up on front-loaders.
Can a Washing Machine Drum Be Replaced?
Yes — the inner drum, the bearing, and the spider arm can all be replaced. The question is whether it’s worth it. These are among the most labor-intensive washer repairs because the machine has to be largely taken apart to reach them. The general rule: if the repair costs more than about half of a new machine, and the washer is more than halfway through its 10–13 year lifespan, replacement usually makes more sense. A technician gives you that honest math during the diagnostic rather than quoting a big repair on a machine near the end of its life — see our guide on how long washing machines last.
Frequently Asked Questions
What is the drum of a washing machine?
What’s the difference between the inner and outer drum?
Why won’t my washing machine drum spin?
Why is my washer drum loud or grinding on the spin cycle?
Why is my washing machine drum loose or wobbling?
Can a washing machine drum be replaced, and is it worth it?
Why does my front-load washer drum smell musty?
Drum Trouble? We’ll Tell You Straight.
Bozmanfix repairs washing machines across Atlanta, Miami, Tampa, Jacksonville, and Charlotte. We diagnose whether it’s a quick belt-or-drain fix or a bearing job — and whether it’s worth repairing — before any work begins.
Book a Diagnostic Washer Repair