Possible motor issue

Problem: Dishes in the top rack no longer are being washed

The motor on this model still works great, but I am wondering if it is suppose to reverse its direction to shoot water up to the top rack.
The motor has 110vAC going to it when it is running.
The impeller shoots water into a small area with two water outlets - one for the bottom rack and one for the top rack. In this same small area where the water is being shot into there is a plastic ball that seems to always block the outlet to the top rack. I figured that the motor may have to reverse and that may somehow pull the ball away from the top outlet and send water up the pipe. With the ball removed there is not enough power to shoot water to both the lower and top racks.
I have attached a drawing that may help. # 58 is the plastic ball, 10 is the small area where the water is shot into and the bottom rack outlet, #32 is the oulet to the top rack.
Any knowledge/ideas would be appreciated. Thank you.

The motor always runs in the same direction the pause in electroninc control is what moves ball back and forth It runs for X number of minutes the hesitates and runs again it goes back and forth through the whole cycle