How do you open maytag dryer mgd4000 bww - Maytag Dryers

I assume the model starts with a M, not a W?

Anyway, you did not indicate if the washer does not do any draining ... or it just leaves a bit of water in the chamber?

No draining issue (no pumping sound):
Your washer could have a faulty drain pump and motor assembly, loose wire connection in the drain pump circuit or it could have a faulty machine control board.

Some draining issue:
It did not look like your washer model has a built in pump suction filter/strainer that is cleanable ... but there could be some obstruction in the pump suction or in the hoses after the pump. Straighten drain hoses and eliminate kinked hoses.
Watch video if you want to inspect the pump and hoses

A possible cause of this could be the discharge hose is plugged at the pump.

open the cabinet:

http://www.partselect.com/dryer+maytag-atlantis-open-cabinet+repair.htm

route the belt:

http://forum.appliancepartspros.com/dryer-repair/25860-dryer-belt-diagrams.html

cotton

Maytag dryer

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My Maytag dryer has two Philips headed screws low on the front surface of the dryer below the door. It is easy to get the front off. There is also a small panel with four screws on the lower left side that can come off so you can get at the motor and belt assembly.

A very common problem in a non-heating gas dryer is what is called the gas coils, especially if it will light briefly and then go out and not relight. You should also check the igniter and make sure there are not cracks or burned places, also thermal fuse and thermostat could cause a no-heat.

Issue:
I have a maytag neptune dryer. When I open the door it doesn't turn on . What could be the problem?

Solution:
This is normal! The dryer has a door switch that will prevent it from operating with the door in the open position. This is a safety feature and cannot be overidden.