roller thrust bearings

REGARDING ON BEARINGS 1) How to prolong service life of bearings? Accurate installation and using, alignment, timely mnitor, re lubrication etc. 2) What is the reason for bearings failure? It is usually incorrect using method, pollution, improper use of lubricant, damage happened in installation and handing, also including installation error, according to the traces can know the reason why it is failure. 3) How to choose bearings? Analyse mechanical device and use conditions. clear the requirement of bearings. select tupe of bearings, select distribution way of bearings. select dimensions of bearing, select installation method of bearings. 4) When select bearings specifications, what do you need to consider? The precision of the bearing (rotation precision, dimensional tolerances) internal clearance and preload bearing material and heat treatment. structure of cage and material.