I don't believe you will damage the hydro running it with the valves open. The relief valves are there just for the purpose of moving the tractor when it is not running.
AJ
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1980 [COLOR="Red"][/COLOR]482- Stock
1981 [COLOR="Red"][/COLOR]582- Mag18, Sleeve Hitch, Spring assist
1979 [COLOR="Red"][/COLOR]682- Mag18, Sleeve Hitch, Spring Assist, #1 Tiller
1980 [COLOR="Red"][/COLOR]782- Mag18, Sleeve Hitch
1983 [COLOR="Red"][/COLOR]982- Stock, Fully Optioned
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