[Efarm]

Hello Folks; I am hoping to get some information on splitting a "C". Under the torque tube I have an access hole for the clutch linkage and a smaller hole just towards the rear of the clutch linkage access. In the smaller access hole I can see a nut apparently threaded onto a bolt or stud but can not see anything more. Can someone let me know what this is for? I want to split the tractor at the torque tube and the tranny to stop a transmission oil leak which shows up at the small access hole. Thanks to all in advance!