Premature failure may be caused by any of the following:
- Misalignment of the ball nut to the screw which results in side loading or eccentric loading will reduce life. Additionally, this may cause the ball bearings to split or get flats on them. The ball bearings may even break out of the return tubes.
- Metal chips, dirt or debris in the ball nut may impede the call bearings from free circulation. The ball bearings may get flats on them because of skidding,
- Lack of lubrication. Proper lubrication will help dissipate heat and reduce metal-to-metal wear of components.
- Exceeding the ball nut critical speed can break pickup fingers off, causing the balls to come out of the nut. Exceeding the screw critical speed will cause the whip resulting in misalignment.
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