I'm gonna go out on a limb and say the hyd cylinder has more than likely got a bad piston seal allowing it to bleed over going up. 
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149,682,1641,1711 with a 12hp in it 1 8" brinly plow 1 10" brinly plow 451 snow blower,H-48 International snow thrower 42" york rake with fold down grader blade.
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