Both spiral pins are good. the fluid was completely drained and everything wiped out. replaced fluid with tractor supply Traveller premium trans/hydro fluid and the NAPA gold 1410 filter. relief valves are popped up and the ball bearing moves freely in both. i did flop them and similar result, it hums like it wants to go when putting lever in reverse, no hum when moved to forward. the tractor has been sitting for Lord knows how many years at the previous owners and now I'm trying to resurrect this thing. i will try the pressurizing
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