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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JBarca wrote:
The bearing bore, it is dead on center tolerance within 4 decimal places or is it sitting on the large end of the tolerance?
The shaft OD, it is dead on center tolerance within 4 decimal places or is it sitting on the small end of the tolerance?
You will need a mic to get that close, a caliper has more chances of error in it which I'm sure you know.
That would be my first place to look. It would not shock me in the least the shaft is ground small or the bearing race too big. Once the bearing starts spinning on the shaft under load, its all over and it's going to gall something. Yes, this is not an interference fit as it has to slide on, but the fit has to be right or the bearing will spin.
Again I agree the shaft shoulder is small, but that small shoulder is not changing the friction holding the bearing from spinning.
Thanks for the reply.
While I did not actually measure the parts, I did manually check the fit when dry and noticed no excess play. Yes, I should have measured and I do have a tool& die shop, so I could have obtained very accurate readings. Maybe I'll pull the worst one and get some measurements.
The bearing obviously did spin to form the burrs and the jury is still out as to what caused the spin. My first thought was that the shoulder giving way and causing excess bearing end play was a factor. With poor mating of the rollers to the race, caused by that excess play, might increase the torque and was the reason for the spin.
