We have a SCAG SWM61 hydro with a sled load of machine hours that the tracking changes as it warms up. not just a little bit but a lot. The right side slows down more than the left. By the time I move to the next job the right side speeds back up for a while and I have to fool with the tracking all the time so I am not fighting it. Tired of fooling with the tracking and ready to fix. Have read about flow testing on here but our local lawn dealer "shops" are pretty bad. In reading past posts it seems that people talk mostly about pump problems when it comes to equipment that slows down warm and wheel motors are only talked about if leaking. Can a person safely assume that the pumps are what goes if there is no obvious problems with the wheel motors? Or do I need to break down and trust the grease balls at one of the local shops to flow test?