Whirlpool Dryer Belt Snapped: Checking Pulley Damage and... | appliancefaults.com

Technical Background:

Whirlpool dryers use a belt-driven system to rotate the drum. The motor spins a pulley, which drives a belt connected to the drum. The idler pulley maintains tension on the belt. When the belt snaps, the drum stops rotating, and a safety switch may prevent the heating element from activating. The MCU doesn't directly monitor the belt but detects lack of drum rotation through other parameters like motor current draw or temperature sensors if available.

Symptoms:

The dryer stopped tumbling, and you may hear a loud thumping or grinding noise before the belt snapped. The clothes are not drying. You might also smell burning rubber.

Possible Causes:

Worn or seized idler pulley bearing
Damaged or cracked drum support rollers
Excessive dryer load
Misaligned drum
Foreign object obstructing pulley movement
Old, worn-out dryer belt

Solution:

1

Unplug the dryer from the 120V AC outlet.
2

Remove the lint filter and any screws securing the lint filter housing.
3

Using a 1/4-inch nut driver, remove the front panel screws.
4

Disconnect the door switch wiring harness.
5

Inspect the idler pulley for smooth rotation and any signs of wear or damage. If the pulley doesn't spin freely or has visible cracks, replace it.
6

Inspect the drum support rollers for damage and ensure they rotate smoothly. Replace if needed.
7

Replace the dryer belt, ensuring it's routed correctly around the drum and idler pulley.

Safety Warning:

Disconnect power before working on the dryer. Use proper Lock-Out/Tag-Out (LOTO) procedures. Capacitors can hold a charge even after the dryer is unplugged, so avoid touching any internal components until they have been discharged. Be aware of sharp edges inside the dryer cabinet.

Prevention:

Clean the lint filter after every load. Avoid overloading the dryer. Periodically inspect the dryer belt and pulleys for wear and tear. Lubricate the drum support rollers annually with a high-temperature lubricant.

Expert Tip:

When replacing the belt, note the original routing. Take a picture before removing the old belt for reference. A common mistake is installing the belt incorrectly, leading to premature failure. Some Whirlpool dryers have a diagnostic mode accessed by pressing certain button combinations (consult the service manual for specific steps for your model) which can run component tests.

Frequently Asked Questions

•What type of lubricant should I use for the drum support rollers?

Use a high-temperature, appliance-grade lubricant specifically designed for dryer drum support rollers. Silicone-based lubricants are often recommended.

•How do I properly tension the dryer belt?

The idler pulley typically has a spring that automatically tensions the belt. Ensure the pulley moves freely and the spring is intact. The belt should be snug but not overly tight. Consult your dryer's service manual for specific tensioning instructions if available.

•What are the signs that the motor itself is failing?

Signs of a failing motor include a humming noise without the drum turning, the motor overheating, a burning smell, or the motor not starting at all. Check the motor windings for continuity with a multimeter and compare to specification if available. Also ensure proper voltage (120V AC) is reaching the motor.

Whirlpool Dryer Belt Snapped: Checking Pulley Damage and Repair Guide

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What type of lubricant should I use for the drum support rollers?

•How do I properly tension the dryer belt?

•What are the signs that the motor itself is failing?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: