Most likely there is a drum roller or a belt idler corroded. take the dryer apart and lube the part with mineral oil or special bearing oil. DO NOT USE WD-40 OR 3 IN ONE OR OTHER LUBE. good luck to you.
If the sound seems to come from the front of the drum it's probably the felt guides. The bottom one will wear first and make a grinding, rattle like sound. You can access it by removing the front panel which includes the door. It fits around the drum at the front. Here's a diagram. Some models have a two piece and some a one piece guide. Part 4 on this diagram is one. It's called a seal here. DIAGRAM
If the sound comes from the rear, there is a nylon bearing and metal socket at the rear center of the drum.
SOURCE: Maytag Neptune Dryer Model # MDE3000AYW
Motor malfunctions usually call for service by a professional. There are three main causes of motor failure: lack of lubrication, a defective motor switch, or worn or frozen bearings. A humming sound can be related to a burned-out motor or a defective switch. Check these trouble spots before you call a professional service person or take the motor to a repair shop. Here's how to check a dryer motor:
Step 1: Remove the back access panel. Then reach behind the drum, motor pulley, and idler arm pulley. If these areas are clogged with dirt and lint, undue strain on the motor may be causing the humming noise. Worn or broken belts can also cause a humming noise. Check the belts for wear and damage. If the belts look all right, you may be able to stop the noise by spraying them with fan belt dressing, available at automotive and hardware stores and home centers.
Step 2: Turn the dryer on. The noise you hear may be the whirl of the spinning drum, not the motor. Some noise is normal.
Step 3: Force a little 20-weight nondetergent motor oil (not all-purpose oil) around the ends of the motor shaft. This lubrication may stop the humming noise. If this doesn't solve the problem, remove the motor and take it to a professional service person.The centrifugal switch on the dryer motor may be located on top of the motor. Humming, no motor power, and no heat can be caused by a faulty centrifugal switch. If the switch is externally mounted, check the terminals of the switch to make sure they are tight and not burned. If you spot trouble, remove the switch and take it to a professional service person for testing. A faulty switch will probably have to be replaced. Some centrifugal switches are located inside the motor housing; you won't be able to remove the switch in this case. Remove the entire motor and take it to a professional for repairs.
If the motor hums, but won't run the pulley on the end of the motor shaft, try turning the pulley by hand.Caution: Before turning the pulley, make sure the power to the dryer is turned off.
SOURCE: maytag neptune dryer makes a loud squeaking noise
This noise will normally come from a defective idler pulley. Access to the idler pulley varies by model, if your dryer has a lower front panel (kick plate) start there. It should lift up and off or it may be held in place with a few screws or snaps; it may also have a catch at the edges or center gap between the kick panel and main panel. To release the catch, push a putty knife, wrapped with masking tape, into the gap and push back the catch. The next easiest access point is the rear panel. The rear access panel is held in place with several screws along the outer edges. The last resort method of access is the removal of the entire front panel. The front panel supports the front of the drum and so removal is more difficult. Front panel removal varies. In general, access is gained by lifting the top (remove the lint trap screws first), removing the screws that secure the front panel, and detaching the panel from the drum.
When reaching into the dryer be careful of sharp edges on the cabinet and interior supports. Reach in to the belt and give it tug. It should be taught and have only a little give. The belt should go under the idler pulley and over the motor pulley. Lift the idler pulley toward the motor to relieve tension on the belt and remove it from the motor pulley.
Turn the idler pulley wheel, it should turn smoothly, quietly and without any wobble. Inspect it for cracks or uneven wear. If the idler pulley does not maintain proper tension or is damaged it should be replaced. Depending upon your model, the entire assembly or just the wheel or bearing may be replaced. Check the bearings as well for excessive clearance also(roller bearings)
SOURCE: The dryer is making a loud noise as it tumbles.
you need to open it most of the dryer need maintanace every 4-5 yars and if you keep runing it you may do more damage.
there are several parts that the drum is turning on them and they get bad after few years. like felts,riders,belt...
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