Whirlpool Washer Won't Agitate or Making Grinding Noise — 5 Causes & Fixes

You load the washer, hit start, and hear the tub fill — but when the agitate cycle should begin, nothing happens. Or worse, you hear a grinding, scraping sound that makes you wince. If your Whirlpool, Maytag, or Amana washer is making noise or refusing to agitate, there's a good chance the idler pulley (part 40045001) has seized up or worn out.

The idler pulley keeps tension on the drive belt that connects the motor to the transmission. When it fails, the belt can't transfer power properly — your washer fills, drains, and spins, but won't agitate during the wash cycle. This is especially common on Amana ALW series models and Maytag Centennial washers.

Quick Symptom Check

Before you pull the cabinet apart, verify these symptoms match what you're experiencing:

• Burning smell during wash cycle — belt slipping against a frozen pulley generates friction heat
• Washer won't agitate but spins fine — the agitate cycle requires more torque than spin; a loose belt shows up here first
• Grinding or squealing noise — pulley bearing has seized, causing metal-on-metal contact
• Spins slowly or inconsistently — belt isn't maintaining proper tension throughout the cycle
• Belt looks glazed or has burn marks — visible evidence of slippage from pulley failure

If you're seeing two or more of these, keep reading. The idler pulley is a $15 part that takes about 30 minutes to replace.

Cause #1: Seized Idler Pulley Bearing (Probability: 65%)

This is the most common failure on models like the Amana ALW432RAW and Maytag SAV2655AWW. The pulley bearing locks up from years of exposure to detergent residue, lint, and moisture. When it seizes, the belt can't rotate smoothly.

How to diagnose: Unplug the washer, tip it back against the wall, and remove the lower front panel. Locate the idler pulley — it's the small wheel on a spring-loaded arm beneath the motor. Try spinning it with your finger. It should rotate freely and silently. If it's stiff, makes grinding sounds, or won't spin at all, it's toast.

Why it happens: The pulley bearing isn't sealed properly on most models. Detergent spray and lint work their way into the bearing over 5-7 years, causing corrosion. Once the bearing seizes, friction generates heat that can melt the plastic housing or burn through the drive belt.

The fix: Replace the idler pulley with part 40045001. While you're in there, inspect the drive belt (order a new one if it's cracked or glazed). The spring-loaded arm typically doesn't need replacement unless it's physically bent.

Cause #2: Worn Pulley Wheel (Probability: 20%)

Even if the bearing still rotates, the pulley wheel itself can wear down. You'll see a deep groove carved into the wheel where the belt rides. This changes the belt geometry and reduces tension.

Visual check: Look at the pulley's outer edge where the belt contacts it. A healthy pulley has a smooth, rounded profile. A worn pulley shows a V-shaped groove worn into the plastic or metal. If you can fit your fingernail into the groove, the pulley needs replacement.

This failure is gradual — you'll notice the washer agitating weakly at first, then not at all as the belt settles deeper into the groove and loses contact with other pulleys.

Cause #3: Broken or Loose Drive Belt (Probability: 10%)

Sometimes the pulley is fine, but the belt has snapped or stretched so much it's slipping. With the lower panel off, manually rotate the motor pulley. The transmission pulley should turn with it. If there's a delay or the transmission doesn't move at all, the belt is the problem.

Belt inspection points:

• Check for cracks on the inner ribbed surface
• Look for glazing (shiny, hardened appearance) from heat exposure
• Measure belt tension — you should be able to depress it about ½ inch with firm thumb pressure
• Smell for burning rubber (indicates recent slippage)

If the belt is damaged, replace it along with the idler pulley — a failed pulley often ruins the belt, and a worn belt accelerates pulley wear.

Cause #4: Weak Idler Spring (Probability: 3%)

The idler pulley sits on a spring-loaded tensioner arm. If the spring has lost tension, the pulley won't press firmly enough against the belt. This is rare but happens on washers that have been disassembled multiple times for previous repairs.

Pull the spring off and compare it to a new one (available as a separate part). A weak spring will be visibly longer at rest. You can also test tension by measuring how much force is needed to extend the spring 1 inch — it should take at least 5 pounds of pull.

Cause #5: Motor Mounting Issues (Probability: 2%)

If the motor has shifted on its mounts, belt alignment goes out the window. The belt will run at an angle, causing rapid pulley wear and inconsistent agitation.

Check that all four motor mounting bolts are tight and the motor sits square to the frame. Look for fresh wear patterns on the belt edges — that's your clue that alignment is off.

When to Call a Pro

Replacing the idler pulley is straightforward if you're comfortable tipping the washer and working with basic tools. However, call a technician if:

• The transmission makes grinding noises even after pulley replacement — internal transmission failure requires specialized diagnosis
• You find metal shavings or heavy rust around the motor area — indicates more serious mechanical damage
• The agitator dogs are stripped (this often gets misdiagnosed as a pulley issue but requires removing the agitator)
• Multiple belts on your model are damaged — suggests an underlying motor or alignment problem

Most pros charge $150-$200 for this repair including the part. Doing it yourself costs $15-$30 for the pulley and belt.

Frequently Asked Questions

Will my Amana washer still spin if the idler pulley fails?

Usually yes. The spin cycle uses centrifugal force and requires less torque than agitation. A failing idler pulley typically affects agitation first because that cycle demands more power to move the heavy, water-soaked clothes back and forth. You might also notice the spin cycle sounds different or takes longer to reach full speed as the pulley degrades further.

Can I just tighten the belt instead of replacing the pulley?

No. The idler pulley on part 40045001 uses a fixed spring tension system — there's no adjustment. If the belt is loose, either the pulley bearing has worn down (reducing the pulley's effective diameter), or the belt has stretched beyond its service life. Replacing the pulley restores proper tension automatically through the spring-loaded arm design. Trying to "make do" just burns up the new belt faster.

How do I know if I need to replace the belt when changing the idler pulley on my Maytag washer?

If the belt shows any of these signs, replace it with the pulley: deep cracks on the ribbed inner surface, glazing (shiny, hardened texture), visible burn marks, or if it's stretched enough that you can pull it more than ¾ inch away from the pulleys. Even if the belt looks okay, consider replacing it if the washer is over 7 years old — you've already got everything apart, and a $12 belt is cheaper than doing this job twice.