I am not familiar with the actual set up here but by way of explanation for those who seem a little confused, a crush collar is a cheap and simple way of setting the pre load. Whatever clamp mechanism is employed, be it nut or bolt, should crush the collar till said nut or bolt tightens against its seating. Any torque wrench setting is based on the thread designation and lubrication and serves in this case to make sure the nut or bolt stays tight in service and is not over tightened; the torque wrench setting has absolutely no effect on the preload of the bearings, this is dealt with by the crushing of the collar which is a one trip device to be discarded after every removal. I have seen these devices used to set the preload on washing machine bearings but never on anything so highly stressed as a bevel gearbox - interesting. Crush collars also serve to "de-skill" the assembly process so money may be the culprit in the design office.
