My 1937 UL 4 speed transmission has been showing signs of needing repair. The trans. was rebuilt about 6000 miles ago new andrews gears. The transmission seemed to be operating fine after rebuild then I noticed that going down from 3rd gear to 2nd gear it would grind a bit. not at all going from 2nd to 3rd or any other gear. I removed the transmission from the bike and removed the lid thinking I would find a slightly bent shift fork . Nothing looked wrong at all in the transmission after studying it for a while I noticed that while spinning the main shaft it would have a small amount of resistance nothing consistent at all. I am hesitant to put it back together not finding anything wrong. Anyone have any ideas THANKS if can help
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I've seen a few bent mainshafts in customers bikes,overlooked by previous "best mechanics" had been thru them. If you used the Andrews shift forks I always grind relief to the the leading edges to Andrews shift forks. -
The small amount of inconsistent resistance you are feeling could possibly be the loose needle bearings found on each end of the countershaft and on the main drive gear.Originally posted by ldfly112 View Post
What commonly happens with them , usually due to condensation moisture in the oil, is that they begin to pit the needles and the races.
This will cause the needle to skid, verses roll. Perhaps the small resistance you feel occasionally.
Hope this helps,
Duke KlemanComment
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