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1979 (or so) Toro 724 (38050) and 2018 Ariens Platinum 24
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What is that button on the left wheel do exactly? Is that a positrac thing like the star on the john deere blowers? I should look for a manual online. So I'll do that
I wouldn't consider it "positrac" since that typically imples some form of limited slip diff . . . What these old Ariens had was an open diff that did well in modest conditions, and with that knob, you turned it and pushed it in to lo the differential for use when conditions got bad (with the corresponding loss of ease of turning).
 
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