|
|
In a message dated 8/27/2003 7:24:28 PM Eastern Daylight Time, n3773@comcast.net writes:
Tom Green of Vans tells me that the main gear roller bearings like to be
tight, that I could even run 4-6 in/lbs of torque on the nut. He says they
are different from ball bearings. I have never heard such a thing and
wondered what is the general consensus on this. My outside bearing races
have worn after 1000 hrs. I always tightened then and then backed the nut
off one face before cottering.
Kevin Lane Portland, OR
e-mail-> n3773@comcast.net
web-> http://home.comcast.net/~n3773
(browse w/ internet explorer)
That is correct. Tapered roller bearings can be damaged if run a bit loose. They have preload figures for each size. The race car bearings are quite large, and I tighten them to 3 foot pounds. I have never had a bearing failure. These bearings have a system that allows for any preload and a positive lock using two lock nuts. You would always want the bearings loaded, so the wheel would track as rigged.
After servicing a bearing, I reinstall it and torque the adjusting nut to 20 foot pounds.
For smaller bearings, use less torque. This assures that the new races are seated firmly in their wells. Then I turn the hub over a few times. Then loosen the adjusting nut until the bearing set shows obvious play. Then tighten the adjusting to whatever torque for your specification.
If the nut is not in a position to install a cotter, think about a shim washer between the adjusting nut and the "wear washer" between the nut and the bearing race. Install a washer that will allow the correct torque and a cotter installation. Only the hard "wear washer" against the inner race. The inner races "walk" around the shaft all of the time. A thin shim washer will wear away. The wear washer is usually pinned or keyed to the shaft, so it cannot turn. Otherwise it would be trying to loosen the adjusting nut all of the time. Another trick, is to buy a collection of nuts. The threads will seldom have identical starts, so one, or another will come out just right over the cotter hole.
Lynn E. Hanover
|
|