This is a problem, either system was not overly strong, it was better but not great, being around these in SW Iowa at IH/CNH dealer for 47 years. The Char-Lynn PS was assist style with its own pump because the tractors factory hyd pump wasn't big enough to rob from to run add on PS. The worst problem that M systems were not live hydraulics besides low PSI & GPM. IH came out with a Behlen PS option that was ok but still robbed from the live Hyd on 300/450 thru a complicated valve priority flow system. SM/SMTA was another goofy set-up, it worked but not great. IH didn't really get it right until 544/656/706up
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