Maytag Atlantis--Spin, but no agitate.

Hello all.

My Maytag Atlantis washer suddenly will not agitate. The motor runs, the belt turns, but the transmission does not turn. When it’s in spin cycle, it runs normally.

I don’t know if this is helpful or not, but I removed the belt, and can turn the pulley counterclockwise (viewed from the bottom). Once the clutch (or brake, or whatever…) engages, the transmission spins. If I turn the pulley clockwise, the transmission does not spin.

Any help would be greatly appreciated.