ZF pump bearing issues

2018-12-07View Original

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Is there a problem with the pump bearing installation? I would appreciate some advice from those with more experience – the locking nut for the pump shaft impeller has broken.

Reply #22018-12-07

Please provide the pump shaft material, thread specifications, impeller material, and nut tightening torque

Reply #32018-12-07

Impellers made of material 2205 for Sulzer ZF series pumps

Reply #42018-12-07

This post was last edited by 3983596_FPPZ on 2018-12-7 at 14:04. The thread failure at the impeller nut is not directly related to the bearings; it is likely a problem with the impeller nut itself. Impeller nuts with the same thread type require a much lower tightening torque compared to ordinary 8.8 grade bolts

Reply #52018-12-07

Thank you to \ud83d\ude4f for analyzing the reasons

Reply #62018-12-07

I’m not sure about the specific material either

Reply #72018-12-07

The sections are marked in Sulzer’s as-built documents

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ZF pump bearing issues

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