Washing Machine Knocking During Spin Cycle

Quick Answer

A knocking sound usually means the machine is physically hitting the cabinet because the suspension system has worn out. Start by checking if the washer is level and if the load inside is balanced, as an off-center heavy blanket is the most common culprit.

Look, most people ignore that knocking sound for weeks until something actually snaps. I've seen outer tubs cracked clean through from the inner drum slamming into them over and over, and at that point you're buying a new machine. Usually when I show up it's worn suspension rods, maybe 30 minutes of work. But keep running it and you're turning a $60 fix into a $600 problem.

GenericWasherSeverity: highDifficulty: intermediate85% DIY Success

Time to Fix

30–90 min

Difficulty

intermediate

Parts Cost

$12 – $85

Tools Needed

Phillips #2 screwdriver, Flat head screwdriver

What Does the KNOCKING-SPIN Code Mean?

OK so here's the deal - a knocking washer sounds way scarier than it actually is. Most of the time you're looking at a suspension kit that costs $40-80 and about an hour of your Saturday. The thing most people don't know is that the tub hangs on rods or shocks, and when those wear out, there's nothing stopping 50 pounds of wet laundry from swinging right into the sides of the cabinet.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Worn or stretched suspension rods45%

Failing hydraulic shock absorbers25%

Unbalanced load or machine not level15%

Worn tub snubber ring or friction pads10%

Loose drive pulley or motor mount5%

Symptoms You May Notice

A loud rhythmic BANG BANG BANG during the spin cycle that gets faster as the drum speeds up
The machine's literally walking across the laundry room floor - I had a customer whose washer moved three feet from the wall in one load
Scuff marks or actual gouges on the inside of the cabinet walls where the tub's been hitting
You can feel heavy vibration through the floor even two rooms away
Inner tub feels loose and wobbly when you push on it with the machine sitting empty and unplugged

Tools Required for Diagnosis

Phillips #2 screwdriverFlat head screwdriverNut driver set (1/4" and 5/16")Socket set with 3/8" driveBubble levelLithium greaseNeedle-nose pliersWork gloves

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
Suspension Rod Kit (Top Load)W10780048 · $45–$85	W10780048	$45 – $85
Shock Absorber Kit (Front Load)DC66-00470A · $30–$60	DC66-00470A	$30 – $60
Tub Snubber Ring285744 · $12–$25	285744	$12 – $25

Frequently Asked Questions

Why does my washing machine only knock during the spin cycle?

During spin, the tub's hitting 800-1000 RPM and any weakness in the suspension gets amplified fast. Think about it - a tiny wobble at low speed is nothing. That same wobble at 900 RPM is the tub slamming the cabinet walls on every single rotation. Your suspension rods or shocks are supposed to keep the tub centered under all that centrifugal force, and when they're worn, they just can't hold it anymore. The agitation cycle doesn't build up nearly enough speed to show the problem, so that's why you only hear it during spin.

Can I fix a knocking washer without buying new parts?

Sometimes, yeah. If it's just unlevel feet or an unbalanced load, you're done in 5 minutes for free. But if you do the bounce test and the tub's flopping around like it's on a trampoline, those rods or shocks are physically worn out and there's no fixing them. They've got to go. Good news is a full suspension kit for most top-loaders runs $40-60 on Amazon, and you can swap them out yourself in about an hour if you're handy with basic tools.

Should I replace all four suspension rods at once?

100% yes, always replace them as a complete set. I know it's tempting to swap just the one that looks broken and call it a day, but here's the thing - if one failed, the other three have been under extra stress picking up the slack and they're not far behind. You've already got the machine open anyway, the kit costs the same as buying singles, so just do all four. That buys you another 7-10 years before you're dealing with this again.

Is it dangerous to keep using a knocking washer?

Honestly, don't keep running it. I've seen the inner drum crack the outer tub completely from repeated impacts, and when that happens water goes everywhere and you're shopping for a new machine. Worst case scenario the whole thing tips over mid-spin and yanks the water supply lines right out of the wall. That's a flood. If you absolutely have to use it, do small balanced loads on a gentle cycle, and get it fixed before you throw another heavy blanket in there.

How much does it cost to fix a knocking washing machine?

Really depends on what's causing it. Unlevel feet? Free. A full suspension rod kit for a top-loader is $40-60 online and you can do it yourself. Front-load shock absorbers run $30-60 for the pair. If you're calling a tech, budget $150-250 with labor. Bearings are the expensive scenario - that's $200-400 or more and on a machine older than 10 years it's sometimes just not worth fixing. Get a repair vs replace estimate before you commit to a big bearing job.

Same Fix on Other Brands

Whirlpool washerUL: Whirlpool Washer UL Code: Unbalanced Load

Models Known to Experience KNOCKING-SPIN Errors

This repair applies to most Generic washers with this error code. Common model numbers include:

WTW5000DW, MVWX655DW, WA45M7050AW, WM3400CW, GTW460ASJWW, WTW4950XW, MVWC465HW, WFW5620HW, NTW4516FW, WA54R7200AW

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on May 20, 2025