Usually the bearing overheating occurs as a result of a defect development. The temperature of the bearing housing should not exceed 70 С°, if standard viscous lubrication is used, the temperature increase by every 15 С° twice reduces lubrication operation time and lead to premature bearing failure. According to practical experience of the specialists of the BALTECH technical service department, the critical heating temperature of the bearing housing is 95 С°, as you should remember that the temperature of the bearing is 5-10 С° higher than the temperature of the bearing housing. Such bearing overheating can be casued by various reasons.
The main reason of the bearing overheating is friction caused by high loads acting on rolling elements. For example, if the bearing lubricant is dirty, the rolling elements have to overcome high resistance. The oil condition can be detected in field using the mini- laboratory BALTECH OA-5000. The volume of the used grease lubricant should be also checked as it also influences the bearing heating. The volume of the lubricant depends on the bearing rotation frequency for 2/3 of volume at n £ 1500 rpm and ½ of volume at n > 1500 rpm.
Among other reasons of the bearing overheating are improper fit, rotor unbalance and misalignment. The unbalance can be eliminated using BALTECH VP-3470 , and the misalignment can be corrected with the shaft alignment system BALTECH SA-4300.