Dryer Idler Pulley (Part 279640) — What It Fixes and How to Replace It
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Understanding the Problem
What 279640 is and why it matters: The 279640 is the OEM idler pulley kit used on many Whirlpool/Maytag/Kenmore dryers (includes the pulley wheel, tri-ring and gasket on most kits). The idler pulley maintains belt tension and guides the drive belt around the motor and drum. When it wears, seizes, or the wheel degrades the belt can slip, make squealing noises, or the drum won't turn. Diagnostic steps (quick checks to confirm 279640 is faulty): 1) Unplug the dryer (or turn off gas and unplug for gas dryers). Safety first. 2) Manually rotate the drum. Listen for loud squeals, grinding, or resistance that feels like a bearing is rough. 3) Remove the front panel or access panel enough to see the belt and idler. Note belt routing or take a photo. 4) With the belt loosened/removed from the idler, spin the idler pulley by hand. It should spin freely and smoothly with no roughness or wobble. 5) Inspect the pulley wheel for cracks, flat spots, or worn grooves and look for crushed or missing rubber tri-ring/gasket. 6) Inspect the spring and bracket that hold the idler — if the spring is weak/missing the pulley won't provide proper tension. Step-by-step replacement (general procedure — model details vary): 1) Safety: Unplug dryer (and shut off gas supply for gas dryers). Wear gloves and eye protection. 2) Move the dryer away from the wall to give working space. Remove lint from the area. 3) Access: Depending on model, either remove the dryer front panel, top, or lower access panel to reach the belt/idler assembly. Use a putty knife or screwdriver to release clips if needed. 4) Document belt routing (take a photo). Remove the drive belt from the idler and motor shaft and lift the drum out of the way if necessary. 5) Remove the old idler: detach the idler spring (note orientation), pull the idler assembly out of its bracket and remove the pulley wheel from the shaft. Some kits are held with a small retaining clip/gasket — remove carefully. 6) Compare old pulley with new 279640. Replace the tri-ring/gasket if provided. 7) Install the new pulley on the shaft, re-install any clips or gaskets, mount the idler assembly in its bracket and re-hook the tension spring. Ensure the pulley is seated and can rotate freely. 8) Re-route the drive belt around the drum and idler according to your photo or a belt routing diagram. Reinstall the drum/panels. 9) Plug the dryer back in (and restore gas). Run the dryer empty to listen for smooth operation — no squeal, no slipping, and the drum should turn under load. When to replace: If the pulley spins roughly, has play/wobble, cracked wheel, or the tri-ring/gasket is flattened or missing, replace it. Replace the belt at the same time if it shows glazing, frayed edges, or heat damage. Safety note: Always disconnect power and gas before working on the dryer. If you are not comfortable removing panels or working around gas lines, hire a licensed technician.
Common Symptoms
Squealing or squeaking during operation, intermittent drum rotation or slipping, burning rubber smell, visible wear on belt or pulley, or drum not turning.
Common Causes
- Worn or seized bearing in the idler pulley wheel causing noise and poor tension
- Cracked, grooved, or deformed pulley wheel or missing tri-ring/gasket allowing the belt to ride improperly
- Weak or detached idler spring or misaligned idler bracket causing loss of belt tension
Popular Parts That Fix This Problem
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Helpful Repair Tip
Remove the belt and spin the pulley by hand: any roughness, noise, or wobble means replace the 279640 idler pulley.
Frequently Asked Questions
How long does replacing part 279640 take?
For a DIYer with basic tools it typically takes 30–60 minutes. Time varies by model — front-service models are quicker; top or cabinet removal can add time.
Can I lubricate the idler pulley instead of replacing it?
No. The idler pulley bearings are sealed and not designed for lubrication. If it's noisy, rough, or wobbly, replace the pulley (279640). Replacing the pulley is inexpensive and prevents belt damage.
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