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SEON | I guess I'll update this thread since I have some experience in this area now. May 2016 I heard a clunk coming from the rear differential that went faster with increasing ground speed. Very long story short we tore it down and found:
1. Broken gear tooth on the left bull pinion
2. Chunks missing from several teeth on the differential pinion.
3. Broken tooth on the reverse idler/park gear.
The day before I made a mistake and set the park brake a spilt second before the tractor stopped moving. I think that's what broke the tooth on the park gear and caused the noise.
Spoke to the previous owner and he said he never had any drive line trouble and he used it on a 36 ft cultivator.
Parts. Ah yes the parts. The reverse idler gear is NLA from CaseIH. The one from A&I was wrong. Don't know what that was supposed to fit. Luckily found a NOS one from a wholesaler.
I found out that the differential ring and pinion are unique to the 6788...a couple mm large diameter pinon shaft than the 6588. There is a TSB out there that told people to upgrade 6588 ring and pinions to the larger 6788 part number. Luckily found one of the last ones anywhere from a wrecker.
Differential pinion bearings are a Timken number and are still available but the race that they go into is NOT available despite it also being Timken.
Edited by rank 11/16/2016 23:28
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international 2+2 question
