Viewing, Protection, and Maintenance of Wheel Hub Bearings
Source: China Bearing Network | Date: January 17, 2013
Wheel hub bearings are crucial components in a vehicle's suspension system. Proper inspection and maintenance can prevent serious issues such as brake failure, noise, or even wheel detachment. Here's a detailed guide on how to view, protect, and maintain your wheel hub bearings. **1. Inspection of the Hub Bearing** - **Checking Tightness**: Start by lifting one end of the vehicle using a jack and securing it with safety stands. Ensure the tire is properly supported to avoid any accidents. - **Manual Check**: Rotate the wheel by hand and check for smooth movement. If you feel any looseness, vibration, or abnormal noises, this could indicate a faulty bearing. For small vehicles, hold the tire with both hands and shake it up and down. A normal bearing should not feel loose or blocked. - **Brake Inspection**: While checking the hub bearing, also inspect the brake system. If there's oil inside the tire, it may be due to a leak from the brake cylinder or lines. This needs to be addressed immediately to avoid further damage. **2. Protection and Maintenance of the Hub Bearing** Before disassembling the hub, make sure the vehicle is parked on a flat surface and the parking brake is engaged. Follow these steps: - Remove the hub cover and dust cap. - Loosen and remove the wheel nuts and tire carefully, taking care not to damage the threads. - If the vehicle has disc brakes, remove the caliper and lock ring or pin. - Use a special tool to remove the hub assembly. - Clean out the old grease from the bearing, journal, and hub cavity. Wipe everything dry with a clean cloth. - Inspect the bearing and race for cracks, wear, or pitting. Replace the bearing if any damage is found. - Check the clearance between the bearing and the journal. The maximum allowable clearance should not exceed 0.1 mm. If it does, replace the bearing. - Apply new grease to the inner bearing and place it back into the hub. - Fill the bearing cavity with grease until it starts to come out from the other side. Apply a thin layer on the hub and shaft cap for rust protection. - Reinstall the outer bearing and hub onto the journal. Tighten the adjustment nut to the manufacturer’s recommended torque. - After tightening, rotate the wheel several times to ensure smooth operation. There should be no axial play or resistance. - Reassemble all parts, including the dust cover, hub cover, and wheel. After installation, drive the vehicle for about 10 km and then check the hub temperature. If it feels hot, the bearing may be too tight and needs readjustment. **Related Articles** - Key Points to Consider When Assembling and Disassembling Bearings - Causes of Fan Bearing Failure and Cleaning Methods - Analysis of Hub Bearing Seals at Home and Abroad - Quality Requirements and Common Issues with Bearing Steel - Four Methods to Open Rolling Bearings For more information on bearings, visit [China Bearing Network](http://www.chinabearing.net). Previous: Main Factors Affecting Bearing Vibration Next: Analysis of Roller Bearing Failure
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