furshore

It now works.  Here is what I did and not did not do.  When I replaced the actuator arm I did not get the metal bracket replaced correctly.  There is a metal "strap" bracket that holds the actuator arm in position.  On that metal strap there is a slot...here is the important part ...there is a projecting metal knob on the wheel just below the strap.  The metal knob must go in the slot on the metal strap for the drive function to work properly.  After I did that everything worked great.  I guess when the actuator arm broke that wheel keep rotating and I did not notice the knob on the wheel.  Thanks for all of the suggestions...just thought you would want to know how it turned out. 

I will try that...busy weekend...probably Monday.  I will post the results.

Thanks...replaced the belt...still not self propelled.  Do you think the cable where it attaches to the actuator arm should be adjusted again? Should I shorten the distance where the cable attaches to the actuator arm or lengthen it?  Any suggestions?

Model U6625900.  The self propelled feature stopped working.  As it turns out it had a broken actuator arm...common problem.  I replaced the actuator arm.  I marked the cable position on the cable so I would put it back the right way.  Still no self-propelled.  Tried tightening and loosening the cable still no self propelled.  Any suggestions?