**Car Wheel: Three Key Views and Eleven Protective Measures**
Home > Bearing Knowledge > Car Wheels Usually Have Three Views and Eleven Protections
Source: China Bearing Network | Time: March 19, 2013
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Maintaining the health of a car’s wheel bearings is crucial for safe and smooth driving. As one of the most critical moving parts in a vehicle, the hub bearing must endure constant stress from braking, weight distribution, and road conditions. If not properly maintained, it can lead to noise, overheating, and even loss of control—especially in front wheels. Therefore, regular inspection and proper protection are essential.
### **Three Key Views When Inspecting Wheel Bearings**
1. **Checking the Tightness**
When inspecting the tightness of a wheel bearing, lift the vehicle using a jack and secure it with stands. Grasp the tire with both hands and move it up and down. A normal bearing should feel tight without any looseness or unusual noises. If you sense shaking or resistance, it may indicate a problem with the bearing or brakes.
2. **Testing the Rotation**
Rotate the wheel by hand to check for smooth movement. If the rotation feels rough or produces a grinding sound, there might be an issue with the bearing. This test helps identify early signs of wear or damage.
3. **Inspecting the Brakes**
While checking the wheel bearing, also examine the brake system. If oil is found inside the tire, it could be due to a leak from the brake cylinder or lines. This should be addressed immediately to prevent further damage.
### **Eleven Steps to Protect and Maintain Wheel Bearings**
1. **Preparation**
Park the vehicle on a flat surface and use wheel chocks to prevent rolling. Ensure the area is clear before starting work.
2. **Remove the Hub Cover and Dust Cap**
Carefully remove the hub cover and dust cap to access the bearing.
3. **Unbolt the Tire**
Loosen and remove the tire nuts, taking care not to damage the threads. If the car has disc brakes, remove the caliper first.
4. **Extract the Hub Assembly**
Use a special tool to carefully remove the hub from the axle.
5. **Clean the Components**
Scrape out old grease from the bearing, journal, and hub cavity. Wipe everything clean with a cloth.
6. **Inspect the Bearing and Raceway**
Check for cracks, fatigue, or pitting on the bearing and raceway. Replace if any damage is found.
7. **Measure Clearance**
Measure the clearance between the bearing and the journal. The maximum allowable clearance is 0.1 mm. If it exceeds this, replace the bearing.
8. **Grease the Bearing**
Apply fresh grease to the bearing and place it back into the hub. Make sure the grease fills the bearing completely.
9. **Apply Grease to the Hub Cavity**
Spread a thin layer of grease on the inner hub and shaft cap to prevent rust. Do not overfill, as this can affect heat dissipation and braking performance.
10. **Reinstall the Hub and Adjust**
Place the hub back onto the axle, hand-tighten the nut, and then tighten it to the manufacturer's recommended torque. Turn the wheel several times to ensure smooth operation.
11. **Final Checks and Test Drive**
Reinstall the dust cap, hub cover, and tire. After driving about 10 km, check the hub temperature. If it's too hot, the bearing may be too tight and needs adjustment.
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After completing these steps, always ensure that the wheel rotates smoothly without any play or noise. Regular maintenance not only extends the life of your bearings but also enhances overall driving safety.
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- Inspection and identification of damaged INA bearings
This article is sourced from China Bearing Network. Please visit [http://www.chinabearing.net](http://www.chinabearing.net) for more information.
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