See if there is a breather/check valve that has messed up and pumping oil up the tube to air filter. Maybe something has gotten stopped up and is holding oil in the valve chamber? I would start by following the tube back to the valve cover/breather. I should have asked first, this is blue (oil) smoke, right? A look in the parts book may help also.
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2072 w/60" Haban
982 with 3 pt and 60" Haban
1811 with ags and 50C
124 w/hydraulic lift
782 w/mounted sprayer
2284 w/54" mowing deck
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