Is it permissible to remove the hydraulic nut immediately after the final position has been reached?

A:  Only if the bearing is mounted mechanically (i.e. without high pressure oil in the fitting joint between bearing and shaft), the hydraulic nut may be removed immediately afterwards. If the hydraulic method is used, it takes ca. 10 to 30 minutes after relieving the oil pressure until the oil has drained completely from the fitting joint. During this period, the axial preload must continue to act on the bearing.

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