Dryer Making a High-Pitched Squealing Noise

Quick Answer

A high-pitched squealing noise from your dryer is almost always caused by a worn drum roller, a fraying or slipping drive belt, a seized idler pulley, or worn drum glides (also called slides or bearings). The specific timing of the squeal helps identify the part: squealing that happens throughout the cycle points to drum rollers or glides, squealing only at startup suggests the belt or motor, and a squeal that changes pitch with the drum's rotation usually means the idler pulley.

Identify the Squeal Pattern

Before you start taking things apart, listen carefully. The nature of the squeal tells you a lot:

Constant squeal during the entire cycle. The drum is spinning on something that is worn and creating friction. The most likely parts are the drum support rollers (rear, and sometimes front) or the drum glides/slides at the front of the drum. These parts support the full weight of the drum and its contents, and they wear gradually over years of use.

Squeal at startup that fades after a few seconds. The drive belt is slipping on the motor pulley or drum as it gets the heavy drum spinning. Once the drum reaches full speed, the belt grips and the squeal stops. This is similar to a squealing car fan belt and suggests the belt is glazed, stretched, or the idler pulley's tension is inadequate.

Rhythmic squeal that pulses with drum rotation. Something is contacting the drum once per revolution. A felt seal that has bunched up, a foreign object (coin, button, underwire from a bra) stuck between the drum and the housing, or a drum seam that has separated slightly.

High-pitched whine or screech that gets louder over time. The idler pulley bearing is failing. The idler pulley maintains tension on the drive belt, and its bearing spins thousands of times per cycle. When the bearing dries out or fails, it produces a metal-on-metal screech that intensifies.

Drum Rollers

Most dryers have two or four drum rollers -- small wheels that the drum rides on. They are located at the rear of the drum (and sometimes the front on certain models). Each roller has a shaft and a bearing surface.

Over years of use, the rubber or nylon surface of the roller wears down, develops flat spots, or cracks. The shaft can also wear, creating play that allows the roller to wobble. Both conditions produce squealing as the drum rotates against the deteriorated roller.

Replacing drum rollers is a moderate DIY project. You will need to:

Unplug the dryer and pull it away from the wall.
Remove the front or rear panel (varies by brand and model).
Support the drum or remove it to access the rollers.
Pop off the retaining clip or nut on each roller shaft and slide the old roller off.
Install new rollers.

The parts cost $10 to $25 for a set. Replace all rollers at the same time even if only one is visibly worn -- the others are the same age and will fail soon.

The Drive Belt

The drive belt is a long, thin, flat belt that wraps around the drum and loops around the motor pulley and idler pulley. It is what makes the drum spin. Over time, the belt stretches, glazes (becomes smooth and shiny), and frays.

A glazed belt slips instead of gripping, producing a squeal especially at startup when the motor is trying to accelerate the heavy drum. A fraying belt makes a flapping or squealing sound as loose fibers contact the pulleys and housing.

To check the belt, open the dryer (remove the top panel on most models) and look at the belt surface. It should be matte and slightly rough. If it is shiny, cracked, or fraying, replace it. A replacement belt costs $5 to $15 and is one of the cheaper dryer repairs.

While you have the dryer open, check the belt path. It should be centered on the drum, properly routed around the idler pulley and motor pulley. A belt that has shifted off-center can rub against the housing and squeal.

The Idler Pulley

The idler pulley is a small wheel on a spring-loaded arm that keeps tension on the drive belt. It spins at high speed whenever the dryer is running. Its bearing is a common failure point.

A failing idler pulley bearing starts with a faint squeal and progressively gets louder over weeks or months. Eventually, if ignored, the bearing seizes completely, the belt stops moving, and the drum stops spinning.

Replacing the idler pulley is straightforward once the dryer is open. The pulley assembly (wheel, arm, and spring) costs $10 to $20. It is held in place by a single bolt or mounting bracket. Swap it out whenever you replace the belt -- they are wear items with similar lifespans.

Drum Glides and Felt Seals

At the front of the drum, where it meets the front panel, there are either plastic glides, a felt seal, or both. These allow the drum to rotate smoothly against the stationary front panel.

When the glides wear down, metal-on-metal contact between the drum edge and the front panel creates a squealing or scraping noise. When a felt seal deteriorates, bunches up, or comes loose, it can drag against the drum and produce a high-pitched sound.

Inspect the front seal by opening the dryer door and feeling along the front edge of the drum where it meets the panel. If the felt is thin, torn, or missing in spots, replace it. If you see bare metal or plastic where glides should be, the glides are worn through.

Felt seals and glide kits cost $8 to $20 and are specific to your dryer model.

If your dryer squeals AND is not drying clothes efficiently (taking two cycles to dry a load), the two problems may share a root cause. A drum that is not spinning freely due to worn rollers or glides requires more energy from the motor, generates more heat from friction, and may not tumble clothes effectively enough for proper drying. Fix the squealing parts and you may fix the drying performance at the same time.

Gas Dryers: Additional Considerations

Gas dryers have the same drum rollers, belt, idler pulley, and glides as electric dryers, so the squealing diagnosis is the same. However, gas dryers also have a blower wheel that can develop issues.

If the squeal seems to come from the back or bottom of a gas dryer and is more of a whirring screech than a grinding squeal, the blower wheel may be loose on its shaft or cracked. The blower wheel pulls hot air through the drum and exhausts it outside. A loose wheel wobbles and contacts the housing, creating noise.

Regardless of dryer type, always unplug the dryer (and turn off the gas supply valve for gas dryers) before any repair work. Gas dryer repairs involving gas lines or the burner assembly should be left to a qualified technician.

When to Call a Professional

The parts described here are all relatively inexpensive ($5 to $25 each), and the repairs are within reach of a handy homeowner with basic tools. However, call a professional if:

You are not comfortable disassembling the dryer
The noise seems to come from the motor itself (internal motor bearings) -- motor replacement is more complex and expensive
You have a gas dryer and suspect the issue involves gas components
The dryer is under warranty

A service call plus parts for a squealing dryer typically runs $150 to $300. Given that a new dryer costs $400 to $800, repairing a squeal is almost always worthwhile if the dryer is otherwise in good condition.