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1, there may be loaded ball gap
    

SKF bearings can be packed into larger and more roller, and some manufacturers design on the inner ring of the bearing gap of the ball in the pre-installation rotation bearing bearings Self-aligning through the large, reset, roll the child just pointed at the ball gap is likely to fall out!

2, the copper alloy cage
   

Copper to keep the aircraft bearing cage and roller shift in three directions, restrictions, and the fourth direction rely on roller bearing inner ring ribs limit the shift. When the size of the cage processing is not in place before installing the axis of rotation through the large bearings Self-aligning, reset, it is possible to fall out!

The most important points are:

1 out roller are generally in the pre-installation manual inspection. Directly loaded on the roller, the direct use of it.

Aligning bearing aligning degrees when in use, can not exceed plus or minus 1.5 degrees (some factories aligning degree is smaller). Out roller bearing installation after use, the chance is very small, if the problem is very serious.