This is a Putzmeister pump.Whats awesome about this video is that while watching the differential cylinders during change over you can see the POH in action.I have had machines in the past that even after zero out swash plate angle that as volume is increased the timing is still substancially comprimised.You may have a 2-3 second faster slower time.This is usually due too trash in the Y1-Y2 control oil tubes,There are very small orifices at the body of the Y1-Y2 control block. Sometimes this dirt/trash can float around and lodge dislodge and give you a real headache.