I've always been too lazy to pull the starter. I remove a few tin screws, get an opening, blow it out with a long skinny blow gun, shoot some WD-40 on the shaft, blow again, try the starter a few times, one last squirt, close it up. It is usually good for a couple years. If you have the starter out, do what George said.
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Travis
1993 Cub Cadet 2064
1988 Cub Cadet 2072
1980 IH Cub Cadet 782 w/CH20
1966 IH Cub Cadet 102 w/K301
1961 IH Cub Cadet O
1967 IH Cub Cadet 102 & 122
JD 2155 w/ 175 loader