Rolling element bearings require minimum loads to function
satisfactorily. This is because the balls or rollers must
rotate when carrying the load.
Skidding will occur if the load is not sufficient to overcome
cage friction and the resistance from the lubricant, especially
during periods of low temperature operation. The consequent
is damage to both raceways and rolling elements. Usually the
load from the shaft assembly is sufficient to prevent this
from happening. In cases where the load is not sufficient,
the bearings can be pre-loaded by the use of springs. In some
instances reduced bearing internal clearance may help but
great caution should be taken to avoid a high pre-load condition,
which can result in catastrophic failure.