Whirlpool washer spins but doesn’t agitate

I have a whirlpool LXR7133JQ0 washer that will not agitate but spins and drains fine. This model doesn’t have agitator dogs, so the easy fix is out. The agitator sits over the spindle and the spindle doesn’t turn when it should be agitating. I can manually turn the spindle with my hand. The motor drive coupler looks fine, so it’s not that (and I wouldn’t expect that to be the problem either). I have heard that transmission problems are rare but I can’t think of anything else it could...

Whirlpool washer spins but doesn’t agitate

via Whirlpool washer spins but doesn’t agitate
by natej3