Dryer is making a loud noise - sounds like it has marbles in the tumbler

Dryer Repair
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[SIZE=3][COLOR=#000000][FONT=Times New Roman][SIZE=3]Maytag Gas Dryer - Model ldg4914aae[/SIZE][/FONT][/COLOR]

[COLOR=#000000][FONT=Times New Roman][SIZE=3]The Dryer is making a loud noise when running. The noise sounds like it has marbles in the tumbler. I opened up the unit removed the belt from the pulley and turn the motor and got the same noise from the motor. So I am thinking it’s the motor. [/SIZE][/FONT][/COLOR]

[COLOR=#000000][FONT=Times New Roman][SIZE=3]The belt also looks like it has a lot of ware and over stretched. I think it also needs to be replaced.[/SIZE][/FONT][/COLOR]

[COLOR=#000000][FONT=Times New Roman][SIZE=3]Do you have instructions to replace the motor and belt?[/SIZE][/FONT][/COLOR]
[COLOR=#000000][FONT=Times New Roman][SIZE=3]Something that will tell me - How do I replace the motor and belt? How much do I need to take the unit apart and in what order? [/SIZE][/FONT][/COLOR]
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Here are your parts
Replacement parts for MAYTAG LDG4914AAE Dryer - Gas | AppliancePartsPros.com

This should help do the job
http://www.servicematters.com/maytag_library/docs/16008714.pdf

Here is a good site with additional info/help
http://www.applianceaid.com/dryers.html

Usually that type of racket is a bad rear idler wheel but it does sound like your motor’s bearings are shot or the centrifugal mechanism is messed up.

I would also check other parts while you have it torn apart might as well do a bit of an overhaul.
Check the following for wear and bearing slop.
Rear support rollers
Front glides
Idle wheel
Drum seals
Any interior felt/sponge seals

Give the interior a good cleaning including the blower wheel
Also a good time to clean/check your vent system.

If the unit is not in good shape it may not be worth investing over $100.00 into it.