Your nemesis:

Some tips on technique from Grand Master kdog:

Just put the spanner down onto the metal collar and bang away, the plastic nut will come with it - broken or not it gets discarded anyhow as the new tubnut has it integrated

And a Tip de Grace from Grand Master Reg:

Perhaps I could keep banging away. spent an hour beating the spanner with a hammer yesterday and it would not budge.

just for the record ...

these later model Maytags have "normal" right-hand threads..

lefty-loosy, righty-tighty

Damn.

Source: Removing the hub nut on a Maytag SAV2655AWW washer