I just purchased my second scag a TT and I have been having lots of probs with the hydros. At first the left side felt all loose compared to the right and didnt seem to have as much power as the right (yes I did check the linkage)...so I droped it off at the dealer and the scag rep was there too. after they got done with it they said there was air in the hydros. (wtf wouldnt that effect both pumps?) they got the "air" out and said it is fine. the left stick felt like normal. well today when I was mowing my yard the right side started screwing up and was like it had no power or if the hydros were dumped. then it went back to normal. then going up a steep hill it didnt make it up all the way. I had the sticks all the way foward and no tires spinning just lots of extra whinning noise from the pumps. I turned around to take it back to my garage and it free wheeled down the hill pulling to the right and ran me into a tree almost causeing me to fly into the tree. I got it to creep to my trailer and it didnt make it up the ramp. so I had a buddy help push while I drove it up. and they tell me air in the lines??? I did check the hydro oil level, looks clean. checked the dumps... could there be bad check vavles in the pumps?