The results of the investigation showed that the friction wheel of the compression unit had been damaged leading to the drop of the compression unit.The replaced friction wheel was requested for investigation, however, it was no longer available.Therefore, a deeper analysis of the part was not possible.The provided pictures indicate that an object between the tomo rod and the friction wheel caused damage to the wheel.The age of the part may have had an additional impact on the degree of damage.Siemens is not aware of similar events.The reported issue at the concerned facility was resolved by replacing the defective part.According to the maintenance instructions xpd3-340.831.20.07.02, chapter: 5.2.10 column longitudinal drive / option: compression, checking the friction wheel, the compression should be regularly checked.
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