NTN import bearings after installation, in order to check for installation is correct, want to undertake operation inspection. Small machine can rotate by hand to confirm whether it rotate smoothly. Check for foreign projects, scars and creasing and cause operation not free, because of installation is bad, the installation seat processing bad and produce torque is not stable, because clearance is too small, installation error, seal and cause excessive torque friction, and so on.
If there is no exception may start power operation.

Large mechanical can't manual rotation, so start immediately cut off after no-load power, mechanical idling, examined for vibration and noise, rotating parts if there is contact, and so on, make sure no abnormalities, into power operation.

Dynamic operation, and low no-load from beginning, slowly, to improve conditions for the rating of the operation. The test run in to check the matters, whether to have abnormal sound, NTN import bearings temperature changes, lubricants leakage or discoloration and so on. If find unusual, shall be immediately suspend operation, and check the mechanic and, when necessary, to dismantle the bearing inspection.

NTN import bearings temperature, general but according to the external temperature speculate that the bearing. But use of oil bearing outer ring directly measuring the hole of the temperature more accurate. Bearing temperature, from the operation began gradually raised, usually 1 ~ 2 hours temperature stability. If bearing installation is bad, the temperature will rise sharply, the abnormal high temperature. The reason such as lubricants too much, bearing clearance is too small, installation bad, sealing device too friction. High speed rotating occasions, NTN import bearing structure, the choice of the ways of lubrication error, etc is the reason.

The rotation of the import bearings NTN stethoscope and examination, a strong metal noise, different sound, irregular sound abnormal for details. The reasons are as bad lubrication, shaft bearing or bad, precision bearing damage, foreign bodies, invasion, etc.

NTN import bearing common faults are as follows:

1, tile surface corrosion: spectrum analysis found that non-ferrous metal elements abnormal concentration; Iron spectrum in appeared many non-ferrous metal components of sub-micron wear particle; Oil water overweight, acid value exceeds bid.

2, the shaft neck a surface: iron spectrum in the iron series cutting grits or black oxide particles, the metal surface HuoSe back there.

3, shaft neck surface corrosion: spectrum analysis found that iron concentration is unusual, many of iron spectral composition of submicron particles of iron, lubricating oil moisture exceeds bid or acid value exceeds bid.

4, surface strain: iron spectral cutting grits are found, grits for the nonferrous metal components.

5, watts back fretting wear: spectrum analysis found that iron concentration is unusual, iron spectral many iron composition sub-micron wear particle, lubricating oil water and acid value abnormalities.

In liquid lubrication condition, sliding surface is oil and not direct contact with separate happened, also can greatly reduce friction loss and surface to wear, the oil film still has certain ability and vibration




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