Roller bearing maintenance and repair

1. During the warranty period, the front axle assembly and drive axle assembly: casting sand holes, original cracks in the axle housing; cracks in the reducer housing or differential housing, and fracture of the differential bearing cover (special regulations or required bridge types) except).

2.Within 10,000 kilometers or 2 months, the rim and spoke assembly: the rim and the spoke are cracked; the wheel lock ring and the retaining ring are loose; the rim is deformed or the balance of the spoke is out of tolerance.

3. Within 20,000 kilometers or within 3 months, the one-way clutch drive axle assembly of the front axle assembly: shaking, swaying, heavy steering when driving; braking deviation; peeling or breaking of the tooth surface of the active and passive gears; the installation of the active and passive gears Improper adjustment causes abnormal wear or abnormal noise; the connecting bolts of the driven gear and the differential case are loose or broken, and the fastening bolts of the differential case are loose or broken; the half shaft, the half shaft sleeve and the axle housing hole are loose; the king pin Loose.

4. Within 10,000 kilometers or within 2 months, the semi-axle is not overloaded or broken due to operation.

Maintenance, overhaul and troubleshooting

In order to maintain the original performance of the roller bearing, the roller bearing manufacturer must use it for a long time in a good condition as much as possible. The bearing must be inspected and maintained regularly to prevent malfunctions, ensure reliable operation, and improve efficiency and benefit.

Regular maintenance should be carried out in accordance with the operating conditions and operating standards of the machine. The content includes monitoring the operating status, replenishing or replacing lubricants, and regular disassembly inspections.

Maintenance items during operation include bearing rotation sound, vibration, temperature, lubricant status, and so on.

If an abnormal state is found during operation, use Table 2 as a reference to find the cause and take corresponding countermeasures. Check the disassembled bearing carefully as needed.

Regarding the matters after disassembly, please refer to the preceding paragraph 5, Inspection and Repair of Bearings.

NSK bearing anomaly detector

Predicting the abnormal condition of the bearing during operation is extremely important in production. The NSK bearing abnormality detector can monitor the condition of the bearing in operation, and once an abnormal condition occurs, it will immediately alarm or automatically stop. It can prevent failures and realize scientific maintenance.

Bearing damage and countermeasures

Generally speaking, the correct use of bearings can achieve fatigue life. However, if accidental early damage occurs, it can no longer be used. Unlike fatigue life, this early damage is called a failure or accident. It is mostly caused by inadequate consideration of installation, use, and lubrication, foreign matter intruding from the outside, or insufficient research on shafts and bearing seats.

The damage state of the bearing, such as the abrasion of the ring rib of a roller bearing, may be caused by insufficient lubricant, improper grade, defective oil supply and discharge structure, foreign matter intrusion, bearing installation error, or excessive shaft deflection. It may also be caused by a combination of the above-mentioned reasons.

Therefore, it is difficult to know the true cause of the damage only by investigating bearing damage. However, based on a full understanding of the machinery, operating conditions and peripheral structure of the bearing, the situation before and after the occurrence of the failure is clarified, and the damage of the bearing and a variety of related causes are analyzed to prevent similar failures from happening again. Table 3 shows the representative bearing damage causes and countermeasures.