MaytaG MODEL # MDG4000BWW. Rumbles and sweels as

SOURCE: wont start, smells like something is burniing

if its electric burning smell,its either a overheating motor,capacitor or both or burnt connections,sounds like a motor problem,it will be very hot to touch if its failing,check capacitor though as it could be causing motor to overheat,rating of cap is on side

SOURCE: Maytag MDG4000BWW gas dryer does not heat up

Below are some links, courtesy of www.repairclinic.com, that will assist you in diagnosing/repair of your dryer. You may have to enter your model number in the search box to access some of the information.

Below is a parts breakdown/disassembly procedure for your dryer.
http://www.repairclinic.com/Dryer-Electric-Maytag-Style-Appliance-Diagram

Firstly, ascertain that you have made a positive heat selection on the control panel temperature switch. The links below are listed in order of failure commonality.

1.Gas Valve Coils
http://www.repairclinic.com/SSPartDetail.aspx?s=t-MDG4000BWW-%3d%3di3479&PartID=3479

2. Ignitor
http://www.repairclinic.com/SSPartDetail.aspx?s=t-MDG4000BWW-%3d%3di3018&PartID=3018

3.Thermal Fuse
http://www.repairclinic.com/SSPartDetail.aspx?s=t-MDG4000BWW-%3d%3di516650&PartID=516650

These are only the most common parts that tend to fail. There are numerous other components that could cause the same symptoms. If the above assistance does not resolve your issue, you may request assistance with an on-line technician, or you can order a service manual from www.repairclinic.com

SOURCE: how do i change the dryer drum belt on a maytag

Try this free video www.appliancehelponline.com/servicemanual.html