Combines N7 right hand seperator shaft

On my farm, that shaft gets pulled every 5 years or 1000 hours _ whichever comes first and new bearings are installed. As mentioned below; tighten, tighten, tighten the bolts. 6-800 lbs._ft. or two big husky folks pulling on wrenches with "cheaters" slipped over them. More than likely, the breakage was caused by improper tightening. The first failure was caused by bearing failure that spun the bearing on the shaft. Please don't ask me how I know this or how much a new clutch shaft for an l2 costs

The service manual says to torque the nut to 350 ft. lbs. +or- 10. This is what I did with the additional step of using a heavy wall pipe that fit over the nut to drive the sheave on with a 20lb sledge and then retighten the nut. I do this until there is no more movement in the nut. On the first failure the bearing appeared to be ok yet, rotated freely with no signs of roughness. Do you think I should disregaurd the service manual and tighten this nut to 600 ft. lbs.

YES. Check about 3_4 way down this page. There is a thread about torque on RH clutch shaft.

Hub has likely eroded away from looseness causing it to be shorter than it should be. Being to short will cause washer next to large nut to bottom on shaft before it crimps hub against inner race of bearing. Be carefull about to much torque for if hub has wore a bit crooked it will bend shaft and cause vibration. Maybe best if hub has wore to have machinist mill it back straight and then add spacer to make up difference from new.