sawdustdad, just musing about your starting woes, you never mentioned the operational status of the donor tractors.....
could it be that one of the hydro pumps has an internal issue and is providing more drag than it should?
Maybe if you remove the spirol pin from the coupler on the front hydro so the driveshaft is free to spin,
try starter again and see if it turns any easier with just one hydro to spin.
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