How to Fix Idler pulley noise on Whirlpool WGD6120HW (Gas)

I’ve worked on the Whirlpool WGD6120HW quite a bit, and idler pulley noise is honestly one of the most common calls I get for this model. That squealing or thumping sound usually means the pulley’s worn bearing has given out, and nine times out of ten, replacing the idler pulley assembly solves it completely.

Dave Holt — Certified Appliance Repair Technician

Experience: 15+ years servicing residential & commercial appliances • Certifications: EPA 608 Certified, NATE-recognized technician • Former lead technician at a multi-state appliance service company • Specialties: Washers, dryers, refrigerators, dishwashers, ovens, microwaves, ice makers

Idler pulley noise

This step-by-step repair guide walks you through fixing idler pulley noise on your Whirlpool WGD6120HW (Gas). With the right tools and parts, most homeowners can complete this repair in 1–2 hours and avoid a costly service call.

🔨 Pro Tip from Dave

On the WGD6120HW, the idler pulley (part number W11307452) sits on a tension arm that can develop a stress crack you won’t notice until the belt slips mid-cycle — always inspect that arm closely before buttoning everything back up. A common mistake I see is techs forgetting to re-route the belt correctly around the motor pulley after swapping out the idler, which causes immediate belt wear and a callback.

Part of our Top 20 Dryer Models & Common Repair Issues Guide. Browse all dryer repair guides for related models and issues.

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Common Symptoms & Causes

If your Whirlpool WGD6120HW is experiencing idler pulley issues, you may notice one or more of the following symptoms during operation.

A loud squealing or screeching noise that starts shortly after the dryer drum begins spinning
A rhythmic thumping or squeaking sound that speeds up as the drum rotation increases
The dryer drum stops spinning mid-cycle while the motor continues running
A burning rubber smell coming from the dryer during operation

These symptoms are typically caused by a worn or seized idler pulley, where the pulley’s internal bearing has degraded over time, causing friction, slippage, or complete failure of the belt tensioning system.

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Safety First

Unplug the dryer from the power outlet before starting any repair — never work on a live appliance.
Wear work gloves when handling metal brackets, sheet metal edges, or sharp components.
Take photos with your phone before disconnecting any wiring harnesses or connectors.
Work in a well-lit area with enough floor space to lay removed panels flat.

Tools & Parts Needed

Essential Tools

Phillips #2 screwdriver
¼” nut driver
Putty knife
Multimeter
Work gloves

Replacement Parts

Step-by-Step Repair Instructions

Step 1

Unplug the dryer from the wall outlet and close the gas shut-off valve behind the unit before touching anything internal, since working on a live appliance risks electric shock and gas exposure. A squealing or chirping sound that occurs specifically during tumbling — not during heating — points directly to a worn idler pulley bearing, which loses its smooth rotation as the grease breaks down over time. Identifying the noise type before disassembly confirms you are targeting the right component and avoids unnecessary teardown.

Step 2

Remove the five ¼-inch hex screws securing the rear panel and set it aside to expose the drive system at the lower rear of the cabinet, where the spring-loaded idler pulley lives. Spin the idler pulley by hand with the belt removed — a good bearing spins freely and quietly, while a worn one will feel rough, gritty, or produce an audible grinding sensation. This manual spin test is the definitive check because a failing bearing may not always be loud at low hand speed but will confirm resistance that worsens under motor-driven load.

Step 3

While the rear panel is already off, spin each drum support roller by hand to check for wobbling, flat spots, or seized rotation, since these rollers wear on the same timeline as the idler pulley and often contribute to or cause similar noises. Replacing a roller that is borderline now costs only a few dollars in parts and saves you from reopening the dryer again in a few months. Pro tip: replace all rollers as a set if any one of them shows wear, because they accumulate equal hours of use.

Step 4

Remove the old idler pulley by releasing the single retaining bolt or pressing out the snap-fit axle pin depending on your production run, then install the new pulley and route the drive belt back over it. Confirm the spring is fully taut once the belt is looped — a slack spring means the belt will slip under load, causing drum drag or a burning smell, which defeats the entire repair. Pro tip: take a quick photo of the belt routing before disassembly so you have a reference when threading it back around the motor pulley and idler.

Step 5

With the rear panel still open, inspect the drive belt along its full length for cracking, glazing, fraying, or a shiny worn surface on the inner rib, since a belt in this condition can snap without warning and leave the drum unable to turn. Replacing it now while the dryer is already open costs only the price of the part and avoids a second service call. A new belt should feel pliable and show a consistent matte texture on the ribbed side with no visible thread exposure.

Step 6

Reinstall the rear panel and tighten all five screws snugly but without overtorquing, which can strip the sheet-metal threads. Reopen the gas shut-off valve fully, plug the dryer back in, and run a complete timed dry cycle while listening for any remaining squealing, chirping, or new vibration. A successful repair will produce only the normal low hum of the motor and the tumbling drum with no high-pitched bearing noise.

Where to Buy Replacement Parts

Find genuine OEM and aftermarket replacement parts for your Whirlpool WGD6120HW (Gas) on Amazon:

When to Call a Professional

If the issue persists after completing all steps above, the problem may involve the sealed refrigerant system, a failed main control board, or wiring that requires specialized diagnostic equipment. Contact a licensed appliance technician — attempting sealed-system repairs without EPA 608 certification is illegal and unsafe.

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How Much Does This Repair Cost?

Replacing an idler pulley on the Whirlpool WGD6120HW typically costs $15–$40 for the part when doing it yourself. A professional service call for the same repair usually runs $150–$300, including labor and parts. Tackling this repair DIY-style can save you well over $100 while restoring your dryer to quiet, efficient operation.

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Frequently Asked Questions

How do I know if the idler pulley is causing the noise in my Whirlpool WGD6120HW?

A failing idler pulley typically produces a squealing, squeaking, or thumping sound that occurs during the drum rotation cycle. If the noise stops when the dryer is empty or paused, the idler pulley is a likely culprit.

Can I replace the idler pulley on my WGD6120HW myself?

Yes, this is a manageable DIY repair requiring basic tools like a putty knife and screwdriver. Always unplug the dryer and shut off the gas supply before beginning any disassembly.

How much does a replacement idler pulley cost for the Whirlpool WGD6120HW?

Replacement idler pulleys for this model typically cost between $10 and $25 at appliance parts retailers. Replacing it yourself saves significant labor costs compared to hiring a technician.

Recommended Products

These are the parts and tools we recommend for this repair, based on compatibility and customer reviews:

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