How to replace blower belt on whirlpool cabrio dryer model wed7800xw0

repairs on a home appliance should be performed by and experience appliance repair technician. a loose or missing blower wheel nut, belt support pulley or drum support rollers are common noises due to wear and tear.

Did you clean the exhaust duct from end to end?
Some of these have a two-belt system where the second belt turns a fan blade that resides in a plastic housing beneath the drum... the pulley will come loose and fall off sometimes which can cause this error... Help Me Find My Model Number RepairClinic com

This is fairly common most of the time the blower drive belt or pulley has fallen off. This video should get you headed in the right direction. Although the video below shows a maytag dryer it is the same cabrio style dryer you have.

Since I don't have the service manual for this model- I'm unsure if this is a direct drive motor to transmission or belt driven through pulleys.

In first scenario motor bearing is shot

Belt driven model, belt is worn or derailed from pulley

3rd reason, clothes could be stuck between spin drum and tub assembly, causing the spin drum to jam.

take the bottom panel off,you'll see a metal duct that the lint filter slides down into,there's a blower wheel behind the duct,if the wheel cracks or gets loose where it connects to the motor shaft it can make this sound,start the dryer and listen to see if the noise comes from there.if you can't tell unplug the dryer,pull out the lint filter and then take out the screws that hold the metal duct in place and remove it,now you can see the blower wheel,spin the drum by hand and see if the blower wheel moves with the drum and belt.if it looks fine stop spinning it and grab the wheel and see if it feels loose,if it is you will be able to tell.also while you have the duct off clean it out,you should take it off at least once a year and clean it out,then vac out the cabinet and blow out your vent line with a leaf blower if it's long,just remove it from the back of the dryer,stick a leaf blower into the vent line and blow it out.go outside first and make sure the outside duct is clear,no cage or anything that will block the lint from blowing outside.if the blower wheel is ok then the noise could be the belt roller or belt pulley,thety sell a kit with all the parts together but usually when someone says it's making a whirring sound it most likely is the blower wheel.hope this helps.

This dryer has 2 belts. A smaller belt operates the blower. The nut tends to back out and the small belt falls off. Here is the result:
Bravos dryer innards of a failed blower belt
Look around on my foggy site for your service manual. Let me know

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Can you spin the drum freely by hand?

On this weird dryer the blower is not mounted to the motor. Instead a fancy blower is mounted away from the dryer and requires a second smaller belt to drive it. What goes wrong? The drive pulley for the blower often falls off the motor. Locktite is recommended to keep the blower pulley secure to the motor shaft or this will be the result:
MAYTAG 2 BELT dryer innards

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The threads are backwards. The pulley end of the motor has a flat spot on it where 7/16 wrench fits. I use a wrench to hold that part down and then I basically shove a flat piece of iron actually ot it a tub nut remover tool into the bales at the 3 o'clock position and slam down the a 12 pound hammer. Sometimes the pulley on these breaks. Most times though if you get mean with it you can get it off there in one piece. The cabinet might be fancy but it has the same setup and any roper/kenmore.whirlpool dryer motor with filter in the top. My crappy home movie of how it all goes down

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Felicia
make sure to see if the blower runs free
in this case is your drum belt broken
if you have someone at home to dissassamble the dryer then
replace the belt and test the machine
this is a normal situation when the dryers are not tumble