We have a whirlpool LXR7133JQ0 washer that we mainly use for washing rags and shoes. It has stopped agitating. It still drains and spins. I can hear a slight hum from under the tub. This model does not have dogs to replace, the agitator is one piece and sits over the spline. I checked the drive coupler and it’s okay. I wasn’t sure that a bad coupler could make it spin but not agitate, but it was easy to check so why not? I’m hoping it’s not the gearcase but what do you all think?