An SM block will have the characters "C264" cast prominently in upper right side of the block above the oil filter canister. A regular M block will show nothing here.
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Another thing to look for if the tractor has live hydraulics: A failing camshaft drive gear.
To check, idle the engine and listen carefully for any rapping or clunking sounds coming from the right front of the engine. Now have an assistant deadhead the hydraulic pump (push or pull the remote hydraulic valve) while continuing listen. If the rapping sound changes or disappears, or if a rapping sound appears, suspect a failing cam drive gear.
Cam gear failures are not uncommon on live hydraulic-equipped Super M's. (I've replaced them on 3 different Super M/400's over the past several years.) Fortunately new cam gears are readily available and not terribly expensive - about $150. However replacement requires removing the entire front end of the tractor - several large, heavy parts.
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