I have a quick question about this. I, too, have a 7720 hydrostat combine and my light is on as well. I was wondering is it common for it to slow down from 12 to 14 mph to around 3 to 5 mph on a grade? Also, I noticed yesterday that some of my hydro fluid spilled onto my driver side tire after I shifted gears while sitting still, is there a reason for that? This is my first combine so I would appreciate any help. Thank you.