Why Is My Dryer Knocking? 3 Common Causes Of Loud Dryer Noise

If your dryer is making a knocking noise, it’s important to address the issue promptly to prevent further damage. While some knocking sounds may be normal, persistent or loud noises can indicate a problem that requires attention. In this comprehensive guide, we will delve into the potential causes of dryer knocking and provide step-by-step troubleshooting and repair instructions.

Identifying the Source of the Knocking

Before attempting repairs, it’s crucial to pinpoint the source of the knocking noise. Listen carefully to the dryer’s operation and pay attention to the following:

1. Drum: If the knocking occurs when the drum is rotating, it could be due to a loose or damaged drum support roller or bearing.
2. Belt: A worn or loose belt can slip and cause the dryer to make a knocking sound.
3. Idler Pulley: The idler pulley helps maintain belt tension and can become worn or misaligned, leading to knocking noises.
4. Motor: A faulty motor can vibrate and produce knocking sounds.
5. Fan Blades: Loose or bent fan blades can strike the dryer’s housing, causing knocking.
6. Objects in Drum: Occasionally, small objects such as coins or buttons can get stuck in the drum and cause knocking.

Troubleshooting and Repairing Dryer Knocking

Once you have identified the source of the knocking, you can proceed with the following troubleshooting and repair steps:

1. Check Drum Support Rollers: Inspect the drum support rollers for any looseness or damage. Replace any worn or broken rollers.
2. Tighten Loose Belt: If the belt is loose, tighten it by adjusting the idler pulley.
3. Replace Worn Idler Pulley: If the idler pulley is worn or misaligned, replace it with a new one.
4. Inspect Motor: If the motor is making a knocking sound, it may need to be replaced. Contact a qualified technician for this repair.
5. Check Fan Blades: Ensure that the fan blades are securely attached and not bent. Replace any damaged blades.
6. Remove Objects from Drum: If there are any objects stuck in the drum, remove them carefully and restart the dryer.
7. Lubricate Moving Parts: Occasionally, knocking noises can be caused by dry moving parts. Apply a small amount of lubricant to the drum support rollers, idler pulley, and motor bearings.

Preventative Measures to Avoid Dryer Knocking

To prevent future dryer knocking issues, follow these preventative measures:

1. Clean Lint Filter Regularly: Regular cleaning of the lint filter prevents excessive lint buildup, which can strain the motor and cause knocking.
2. Unload Dryer Promptly: Avoid leaving wet clothes in the dryer for extended periods, as this can increase the load on the motor and lead to knocking.
3. Inspect Belt Regularly: Check the belt for signs of wear or looseness and replace it if necessary.
4. Lubricate Moving Parts: As mentioned earlier, applying lubricant to moving parts can prevent excessive noise and premature wear.
5. Level Dryer: Ensure that the dryer is level and balanced to reduce vibration and knocking.

When to Call a Professional

While some dryer knocking issues can be resolved with DIY repairs, it’s advisable to seek professional help if:

1. The knocking noise is persistent and loud.
2. You are unable to identify the source of the knocking.
3. The dryer is vibrating excessively.
4. You suspect a faulty motor or other major component.

What You Need to Know

1. Why does my dryer knock when it starts up?

• This could be due to a loose belt or a worn idler pulley.

2. Can a loose drum cause knocking?

• Yes, a loose drum can knock against the dryer’s housing.

3. How can I prevent my dryer from knocking?

• Clean the lint filter regularly, unload the dryer promptly, and lubricate moving parts.

4. Is it safe to use a dryer that is knocking?

• It’s not advisable to use a dryer that is making loud or persistent knocking noises.

5. How much does it cost to repair a dryer that is knocking?

• The cost of repairs depends on the cause of the knocking and the extent of the damage.