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1. Improper operation
Reasons: improper installation, operation or disassembly may cause cage deformation or defect
Recommendation: appropriate operation, installation and removal tool
2. Inadequate lubrication
Reasons: inadequate lubrication or components incorrectly, you may cause abrasions or serious INA bearing deformation
Recommendation: improved lubrication system, the timing is appropriate to supplement or replace the lubricant
3. Rust and corrosion
Reason: contact with water may cause the water pump bearing element erosion and rust. The bearing corrosion damage in the work may lead to spalling
Recommendations: periodic inspection seal to ensure a good seal, correct storage INA Bearing
4 Current
Reason: rotation energized may cause grooves or nicks. The bearing stationary electrical operation Improper grounding will cause minor burns
Recommendation: through appropriate ground connection prior to soldering the parts on the outside of the INA bearings reduce or avoid current through the bearing
5 external material
Reason: wear particle pollution and debris intrusion may lead to wear imported bearing face, scrapes and dents
Recommendation: to clear invasive particles and debris, replace the lubricant, check the sealing system
6. Eccentric
Reason: eccentric, inclined or excessive load may cause geometric stress concentration or flaking
Recommendation: precision machining INA Bearing seat and retaining shoulder
INA bearings after the end of the installation, in order to check whether the installation is correct, operated check. Small machinery can be rotated by hand to confirm whether or not to rotate smoothly. Nick, indentation inspection items dysfunctional due to poor installation, poor mount processing the torque generated by instability, the clearance is too small, the installation error, excessive seal friction torque and so on. If no abnormal power operation can begin.
Power operation, from the no-load low speed, slowly increased to the rated operation of the conditions set forth. Commissioning checks matters, whether there are abnormal Sound pump shaft bearing temperature changes, leakage of the lubricant, or color and so on. If it is found that the exception should immediately suspend the operation, inspection machinery necessary to remove the INA Bearing examination.
1, the assembly of the foreign body to prevent: iron filings into the bearing internal bearings can easily be mounted on the rotor to be balanced dynamic balance, therefore it is best to do balancing mounted bearings. Some manufacturers in order to facilitate assembly, the bearing indoor assembly coated with oil or grease for lubrication effect, but often operating staff is difficult to control the amount of, oil or grease in the bearings indoor accumulates more in the water pump bearing easily rotated along the axis into the INA Bearing internal. Bearing chamber is preferably not coated with oil or grease, such as non-coated not have to control may not bearing indoor accumulates.
The paint rust prevention: paint rust characterized multiple motor in the sealed-motor assembly sound good, but put in the warehouse for some time after the motor abnormal noise becomes large, remove the water pump shaft even the bearings serious rusting. Many manufacturers will be considered bearing our continuous publicity Motor Factory have realized mainly insulating paint. The problem is mainly due to the The insulating paint out of the volatile acidic substance is formed in a certain temperature, humidity of corrosive substances, the bearing channel etched lead to damage to the INA Bearing. The problem can only be a good selection of insulating paint, assembly and after the ventilation period of time after drying.
, Shaft and bearing chamber tolerances choice and control: the pump shaft bearings pressed into the bearing should be flexible rotation block flu. If any signs of rotation is not flexible, indicates that the size of the shaft is too much tolerance to be reduced. The water pump shaft with bearings pressed into the shaft the hand rotation there is a sense of "imperfections" is too much tolerance of the shaft or shaft roundness bad. Therefore, the control shaft and the bearing chamber tolerances should control roundness, many domestic manufacturers tolerance control control, no roundness.
4, the bearing assembly: because the bearings are high precision products, such as improper assembly easily pump shaft bearing channel caused by injury, resulting in damage to the INA Bearing. The bearing assembly should have a dedicated mold can not beat, only a small circle force pressed into the shaft, the pressure of the big circle can only large circle force. Assembly requires the use of pneumatic or hydraulic pressure, touch up and down in the press-fit when outside the state level, tilt, if any, the bearing channel will result in damage due to power, the bearings to produce the guide ring.
INA Bearing life is closely related with the manufacture, assembly, use, and must be in every aspect of the well, in order to make the water pump bearing is in the best operating condition, thus extending the service life of the bearings.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-3778/3720 NTN | 47.625 | 93.264 | 30.302 |
| 4T-M804048/M804010 NTN | 47.625 | 88.9 | 25.4 |