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mcguyver · January 29th, 2006, 22:57

1mm is alot of movement. Your shims should be 0.1, 0.2, 0.5 mm respectively. you should be using the 0.1mm shims as a baseline and go from there. You may have to allow some movement (less than what you can compensate for with the 0.1mm shims) to get "low rolling resistance" from the gears. I've yet to run across a situation that allowed too much lateral gear play that could not be addressed with the above mentioned shims. Just keep at it as it may take a good deal of time to get it just right.

And make sure your bushings are not loose in the mechbox as they should fit tight and not fall out. And make sure if they are tight that they are driven in fully. Then your shimming should be straight forward. If the bushings are loose and fall out, either try different bushings or replace the mechbox. Don't think this doesn't happen all the time. Mechboxes can be toast even though they "look fine". If the bushings aren't a snug fit along the outer race, shimming will be difficult to impossible and you now will start to significantly increase wear to the "bushing holes" and increase their diameter. This leads to even more gear play and eventually failure. The looser the bushings are, the faster this will occur.

January 29th, 2006, 22:57	#2
mcguyver Trader rating Join Date: Aug 2005 Location: Northern Alberta	1mm is alot of movement. Your shims should be 0.1, 0.2, 0.5 mm respectively. you should be using the 0.1mm shims as a baseline and go from there. You may have to allow some movement (less than what you can compensate for with the 0.1mm shims) to get "low rolling resistance" from the gears. I've yet to run across a situation that allowed too much lateral gear play that could not be addressed with the above mentioned shims. Just keep at it as it may take a good deal of time to get it just right. And make sure your bushings are not loose in the mechbox as they should fit tight and not fall out. And make sure if they are tight that they are driven in fully. Then your shimming should be straight forward. If the bushings are loose and fall out, either try different bushings or replace the mechbox. Don't think this doesn't happen all the time. Mechboxes can be toast even though they "look fine". If the bushings aren't a snug fit along the outer race, shimming will be difficult to impossible and you now will start to significantly increase wear to the "bushing holes" and increase their diameter. This leads to even more gear play and eventually failure. The looser the bushings are, the faster this will occur.