Agitator doesn't move and machine makes a loud "growl" but spin cycle works. This is a Maytag "Atlantis"

Top Loader? That sounds like a gearbox problem. It is not an easy fix. With that much use and those many years, it is probably time for a new one. A new High Efficiency Front Loader, will save you a fortune in water, electricity and detergent.

Try this forum though if you want to try and get it fixed.

https://www.automaticwasher.org/cgi-bin/TD/TD-VIEWTHREAD.cgi?71822

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Does it make the sound during the rinse cycle?

Look under the washer. Is there a little pile of black rubber shavings? This sounds like the basket coupler between the motor and the drum. If the coupler is the problem it is inexpensive to fix. Some also call this part the "clutch". It kind of looks like a hockey puck with six holes in it... three for the motor, three for the clothes drum. In your case, I suspect that the holes are intact in the direction of spin, but as soon as it reverses for agitation, it breaks out through the back of the holes.

see this possible causes:
t doesn't pump or spin
frozen pulley+ test lid switch
It pumps, but doesn't spin
motor coupler+ lid switch test
It spins only with the lid closed
safety, only work with lid close test. see the diagram
God bless you

Hello,

This means that the transmission has failed, check the use and care guide some had a ten year warranty.

Let me know,

http://www.appliancerepairlesson.com/

Washer may be out of balance, Move closes around in washer and restart

check the belt and or transmission

Hi, Can you tell me if the spin cycle works? It sounds like maybe a couler has gone bad. Also check and see if the lower half of the agitator is working at all.
Please let me know and I can help you through this.

Thanks
Vic

Hi, this is a bad transmission gear box that is stripped at the moment. i recommend purchasing a agitator kit and a new transmission Assembly and clutch as well. this will fix your issues

If the fill and drain functions correctly, AND the spin cycle works correctly, AND the cycle itself starts and completes correctly, the problem being that the back and forth motion of the agitator starts the loud grinding noise, it will likley be broken gears in the transmission. The single most expensive part in the washing machine.