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NTN bearings after installation, in order to check for proper installation, to running inspection. Small machinery can be rotated by hand, to confirm whether the rotation is smooth. Check the project caused due to foreign body, scars, indentation dysfunctional, due to poor installation, mounting process arising out of the bad moments are not stable, because the clearance is too small, installation error, sealing caused by friction force is too large and so on. If there is no anomaly can begin power operation.
Large machinery can not be manually rotated, so the no-load starting immediately after power cut, the machine idle, check whether the vibration, noise, rotating parts are in contact and so on, confirmed no abnormal, into the dynamic operation.
Power operation, from the no-load speed, slowly increased to the rated operating conditions. Test run of issues, whether there is abnormal sound, NTN bearing temperature changes, lubricant leakage or discoloration etc.. If abnormal, should immediately suspend the operation, inspection machinery, to remove the NTN bearings checked when necessary.
NTN bearing temperature, generally according to the NTN bearing the external temperature estimation. But the direct measurement of NTN bearing outer ring by using oil hole temperature more accurately. NTN bearing temperature, from a running start rising, usually 1~2 hours after the temperature stability. If the NTN bearing mounting bad, the temperature will rise sharply, abnormal high temperature. The reason such as excessive lubricant, NTN bearing clearance is too small, poor installation, the sealing device too much friction. High speed applications, NTN bearing structure, the choice of lubricating mode is also the cause of the error.
Turn tone with a stethoscope to check NTN bearing, there is a strong metal noises, abnormal sound, irregular sound that abnormal. Due to poor lubrication, shaft or NTN bearing, NTN bearing damage bad precision, foreign intrusion etc..