Al,
I found this post on another site that one guy was talking about the knuckles on the driveshaft popping out and getting damaged. He replaced the ends with socket universal joints. the second poster commented that there is a hole in the end of the driveshaft square scoket ends. See attached picture. He suggested taping the holes and puting set screws in each to keep the square shaft ends from pulling away from the gear box and the roller shaft. It made since to me that this was the real problem with the driveshaft, that was causing the knuckles to break. So I picked up two 3/16 set screws and a 3/16-24 tap from TSC and tapped the holes.
I've run about 14cu-yards with no problems with the driveshaft.
See link to TractorPoint.com
TractorPoint.com JM6 driveshaft problem
Userid: kwschumm :
"I believe the big problem is that the female square end can cock and cause the male end to round off and eventually shear. The female square end of the driveshaft has two holes in it that can be tapped for set screws. That should keep it from sliding back and cocking. It looks like it was designed for this but for some reason they didn't bother."
Hope this helps,
I found this post on another site that one guy was talking about the knuckles on the driveshaft popping out and getting damaged. He replaced the ends with socket universal joints. the second poster commented that there is a hole in the end of the driveshaft square scoket ends. See attached picture. He suggested taping the holes and puting set screws in each to keep the square shaft ends from pulling away from the gear box and the roller shaft. It made since to me that this was the real problem with the driveshaft, that was causing the knuckles to break. So I picked up two 3/16 set screws and a 3/16-24 tap from TSC and tapped the holes.
I've run about 14cu-yards with no problems with the driveshaft.
See link to TractorPoint.com
TractorPoint.com JM6 driveshaft problem
Userid: kwschumm :
"I believe the big problem is that the female square end can cock and cause the male end to round off and eventually shear. The female square end of the driveshaft has two holes in it that can be tapped for set screws. That should keep it from sliding back and cocking. It looks like it was designed for this but for some reason they didn't bother."
Hope this helps,