3500lb axles bad design
Probably most medium size trailers have the 3500lb axles and 10" brakes. The design of the spindles has little to no shoulder to locate the inner bearing. When I looked up the blueprints, I found th...
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Lynnmor wrote:
I pulled that hub and measured.
Spindle is 1.3760" should be 1.3760"
Bearing is 1.3779" should be 1.3775"
(A Chinese bearing measured exactly the same.)
Nominal clearance is .0015"
Mine is .0019"
I couldn't readily find a source of tolerances, but I would think a deviation from nominal of .0004" would be acceptable.
Hi,
This is good info. On bearing fits, 0.0005" can be the difference in working or not. Need to drill into what the min and max running clearance needs to be to work properly. I normally deal with interference fits on bearings, so what I have out of my head will not apply here. Have to do some digging into the max clearance and when you exceed that, the bearing will spin. 0.0019" clear sounds "big" to me.
The bearing will slide on with 0.0005" to 0.001" clearance. Having a lot more than that my gut says it's not good. Need to dig in on this and report back.
Thanks
John
