Washing machine agitator not working
I'm not familiar with your orbital transmission. But, what brief research I did implies the transmission is a common replacement on these, at almost $300. So, get a new washer.

A simple test on yours was to see if you could spin the big pulley by hand. It would turn only if still "good". The motor is trying to spin the transmission but it's completely locked up. But, if you can wiggle it, beat it with a sledge hammer or ask it nicely to move then move it &amp; try an agitation run to see if it engages. If so, then still get a new washer.