**Protection and Maintenance of Wheel Bearings and Pump Bearings** Home > Bearing Knowledge > Protection and Maintenance of Wheel Bearings and Pump Bearings *Created on 2018/5/16* var cpro_id = "u3440131";

Protection and Maintenance of Hub Bearings and Pump Bearings

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/*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';

**First, the protection of the wheel bearing:** 1. **Visual and tactile inspection:** Check the wheels manually to see if the rotation is smooth and whether there are any unusual noises. If the rotation is unstable or there's a grinding sound, it may indicate a faulty brake system. If there’s no noise but the rotation feels unstable or tight, it could mean the bearing is damaged. In such cases, the hub should be removed for further inspection. For small vehicles, grasp the tire with both hands and pull it back and forth. If the bearing is in good condition, there should be no looseness or resistance. If you feel significant looseness, the wheel hub needs to be removed for repair. 2. **Checking the tightness of the hub bearing:** Ensure the vehicle is safely supported on a lift or jack stands. Then, check the axle and the wheel assembly for any signs of wear or damage. 3. **Brake inspection:** While checking the hub bearings, also inspect the brake components. If oil is found inside the tire, it might be due to a leak from the brake caliper or hydraulic lines. This issue should be addressed promptly to prevent further damage. **Preparation before removing the hub:** 1. Remove the tire nuts and tires carefully, being cautious not to damage the threads of the bolts. If it's a disc brake system, remove the brake caliper first, then use pliers to take off the lock ring or pin. 2. Remove the hub cover and dust cover to access the bearing. 3. Use a special tool to remove the hub assembly. 4. Inspect the bearing and raceway for cracks, fatigue, or looseness in the rolling elements. If any damage is found, replace the bearing immediately. Also, if pitting is present on the raceway, the bearing must be replaced. 5. Clean the old grease from the bearing, journal, and hub cavity using a scraper. Wipe everything dry with a cloth and ensure the inner hub cavity is clean. 6. Check the fit between the bearing’s inner diameter and the journal. The clearance should not exceed 0.1 mm. Measure the journal at the top and bottom where wear is most likely. If the clearance exceeds the limit, the bearing should be replaced. Avoid any burrs or pits on the journal that could reduce the clearance. 7. Apply fresh lubricating grease to the bearing and place it back into the hub. 8. Reinstall the outer bearing and hub onto the journal. Tighten the adjusting nut by hand first, then use a torque wrench to tighten it according to the manufacturer’s specifications. After tightening, rotate the hub several times to check for smooth operation and ensure proper alignment. At this point, the bearing should be firm, the wheel should turn freely, and there should be no axial play. 9. When refilling the bearing with grease, push the grease in until it comes out from the other side. Apply a thin layer of grease to the hub cavity and the shaft cap to prevent rust. Be careful not to overfill, as excess grease can cause overheating and affect braking performance. 10. Finally, reinstall the locking clip, fixing nut, tire, dust cover, and hub cover in the correct order. 11. After the adjustment, drive the vehicle for about 10 km. Stop and check the temperature of the hub. If it’s too hot, the bearing may be too tight. Adjust the tightness accordingly to ensure proper function. **Maintenance of Pump Bearings:** 1. For rolling bearings using lubricating grease, replace the grease after 1500 hours of operation. The amount of grease added should be appropriate—neither too much nor too little. Too much or too little grease can cause overheating. Usually, filling the bearing chamber to 1/2 to 2/3 of its volume is ideal. 2. New pumps typically require a grease change after 100 hours of operation, followed by replacements every 500 hours. 3. Ensure all containers used for storing grease or oil are clean and sealed. Avoid contamination from dust, metal shavings, or other debris that could damage the bearings. 4. Motor bearings often use sodium-based grease, which has a high heat resistance (up to 125°C) but dissolves easily in water. Therefore, it is not suitable for water pump bearings. 5. When adding lubricant to bearings, follow the manufacturer’s guidelines regarding the amount and method of application.

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