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7790 and sunstrand hydro

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My 7790 Simplicity which I have owned for 1 year purrs like a kitten. Since graduating from many year of riding upon gear driven tractors(B1 and a B10) the Sundstrand hydro leaves me wondering if its in good working order. When I go up a hill fast the transmission kicks to a lower speed and pulls firmly at the much slower speed. Maybe this is normal operation and just takes some getting used to. I have recently changed the fluid and the filter. My question is what are the symtoms of a failing hydro?

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