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INA bearing clearance is too small, increase the bearing frictional moment, resulting in a lot of heat, easy to cause damage to the bearing heat. This is because, when the work of the bearing clearance is too small will result in poor lubrication of bearings and bearing both within and outside the ring, create a lot of heat due to dry friction, abrasive, cement, INA bearings inner and outer rings burst and so on, until the bearing damage. Bearing temperature checks generally inferred from shell exterior. Uses of oil hole, direct measurement of bearing outer ring temperature, more accurate. Bearing temperature operation began to gradually rise, without exception, usually stable after 1-2 hours. If the bearings or install bad, sharp increase in bearing temperature, abnormal high temperature. The reason such as excessive lubricant, bearing clearance is too small, poor installation, sealing device too much friction. Occasions of high speed rotation, selection of bearing lubrication method is also the cause of the error.
INA bearing after the installation is complete, in order to check for proper installation, to run checks, small machines can rotate the confirm that the rotate smoothly. Check the project due to foreign body, scarred, indentation caused to seize up, because of the bad installation, mounting process arising out of the bad spin uneven torque, sealed by the clearance is too small, the installation errors caused by friction torque, and so on. Without exception you can start power function.
Due to large machinery cannot be rotated manually, so no load starting immediately after turning off the power, coasting, check for vibrations, noise, rotated part is contacted, and so on, confirm without exception into the dynamic operation.
Dynamic operation, starting from no load speed, slowly raised to the conditions set forth in the rated operation. Things to check for in the commissioning, whether there is abnormal noise, INA bearing temperature transfer, leakage of lubricant and change color, and so on. Test run if exceptions are found, should immediately suspend the operation, check the mechanical, it is necessary to remove the bearings when checking.
Working for INA bearing clearance is too large, primarily by natural selection of clearance is too large bearings, bearing caused by insufficient clamping force. Joint reducers in high-speed operation, when the natural bearing clearance is the larger, determines the operational clearance is relatively large, this will cause vibration reducer in running large, reducing the service life of the bearing. When INA bearing natural clearance selection of reasonable, if borne by the bearing housings to the clamping torque less than when the bearing friction moment of running, bearing outer ring rotation behavior will occur, thus wear bearing holder metal, reducing meshing of gear accuracy, resulting in vibration. When the metal worn to a certain extent, would result in increases or decreases in Center distance of gears, gear backlash and gear positioning is the exact problem, leading to tooth broken, reduced INA bearing service life.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| RNA4838 NSK | 210 | 240 | 50 |
| RNA4836 NSK | 195 | 225 | 45 |