Hello,
My whirlpool dryer runs very loud sometimes we can’t even hear our t.v in the next room its so unbearable, im not sure what the issue is, but i would like to know, or get some kind of manual. i was thinking its the front support bearing/front wheel but i don’t know exactly how to take it apart please help 
There are no front drum support rollers in your dryer.
Very likely the problem is a worn out rear drum support rollers and/or a bad idler pulley. It is also a good time to replace the drive belt. The disassembly instructions are attached to the post.
Here are the breakdown diagrams and Parts for Whirlpool LG7801XMW2 Dryer - AppliancePartsPros.com
Gene.
27 and 29 inch old dryers._ Servicing components of the dryer mechanical system.pdf (307.4 KB)