The standard first question is what hydro filter is installed. Automotive filters have check valves which may not allow fluid to pass. I use Cub Cadet filters. There is a list on here for other compatible filters.
https://www.onlycubcadets.net/forum/showthread.php?t=12
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1863, 1864, 48" and 54" mower decks, 54" snow plow, 451 snow blower, TracVac 580
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