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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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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