I replaced my ISO mounts with the Genuine Cub Cadet parts a year ago. I also used new grade 8 bolts of the correct size and length from Caterpillar, along with washers and locking nuts. If I correctly recall, the instruction sheet tells you to install the mounts to 100 inch-pounds of torque. That seems to me to be awful tight. I had a lot of discussion on this forum and basicly was told that I ruined the mounts at that torque. Not so, but I loosened the mounts to the recommended 1-1 1/2 threads showing. The mounts were so loose that they were able to be turned with the fingers. The K-301 jumped around so bad that it was hard to ride the tractor going down the street.
Finally, I just started tightening. I would tighten a turn and take the tractor for a ride. I played several days at this, and finally got the mounts to do their job. I think there are about 4-6 threads showing. The tractor now runs and rides nice, but still retains its affectionate name; the 1250 Nightmare!
Good luck with your project, and don't be afraid to experiment with the tightness of your mounts. You'll find the right place.
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