I've never seen a Bison II, but from your description it sounds like it's nearly identical to the S630, Satoh Bull. I had one, very good little machine. Uses a 25hp Mitsubishi diesel, while the Bison (650g) used a Mazda gas engine, also common on some forklifts. these were made for the North American market, so English manuals are available, at least for the Bull and Bison, Not sure of the Bison II. For engine work, I'd search for a Bull manual. Looks like several are being sold on the net. Maybe if you used the model number (650, 630 or whatever is on yours) it would help. I will tell you that the little two cylinder diesels are noisy at lower speeds, but smooth out at working speed. Much more noise and vibration than the later 3 cylinder versions from Mitsubishi, and Yanmar.]]
As others have stated, use the additive of your choice, ATF, etc.. Then work it, not just run with no load, but really work it, get it up to operating temp and run for awhile.
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