**Protection and Maintenance of Hub Bearings and Pump Bearings** Home > Bearing Knowledge > Protection and Maintenance of Hub 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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*Created on 2017/12/25* var cpro_id = 'u3171089';

### **First, Protecting the Wheel Hub Bearings** 1. **Manual Inspection of Wheel Bearings**: Check the wheel by hand to see if it rotates smoothly and listen for any unusual noises. If the rotation is unstable or there's a strange sound, it could indicate a problem with the brakes. If there’s no noise but the wheel feels loose or tight, it may signal a faulty bearing. In such cases, the hub should be removed for further inspection. For smaller vehicles, grasp the tire from the top and bottom with both hands and pull it back and forth repeatedly. If it feels loose or stuck, it may mean the bearing is damaged. A noticeable looseness suggests that the bearing needs attention. 2. **Checking the Tightness of the Hub Bearing**: First, inspect the wheel axle at one end of the car. Ensure the vehicle is safely supported on a lift or jack stands, and use wooden blocks for added safety. 3. **Brake System Inspection**: While checking the hub bearing, also examine the brake system. If oil is found inside the tire, it might be due to a leaking brake caliper or brake line. This should be identified and fixed promptly to avoid further damage. ### **Preparation Before Removing the Hub Bearing** Before removing the hub, ensure the car is parked on a flat surface and the parking brake is engaged. Follow these steps: 1. **Remove the Tire Nuts and Tire**: Carefully remove the nuts and take off the tire. Be cautious not to damage the threads of the wheel bolts. If it's a disc brake, remove the brake caliper first, then use pliers to remove the lock ring or pin. 2. **Remove the Hub Cover and Dust Cap**: Take off the hub cover and dust cap to access the bearing. 3. **Use a Special Tool to Remove the Hub**: Use a hub removal tool to carefully take out the wheel hub. 4. **Inspect the Bearing and Raceway**: Examine the bearing and raceway for cracks, wear, or looseness in the rolling elements. If pitting or damage is found, replace the bearing immediately. 5. **Clean the Bearing and Journal**: Scrape off old grease from the bearing, journal, and hub cavity. Clean the area thoroughly with a cloth and dry it before wiping the inner hub cavity. 6. **Check the Fit Between Bearing and Journal**: Measure the clearance between the bearing inner diameter and the journal. The maximum allowable gap is 0.1 mm. Measure the journal at the top and bottom (the most worn areas). If the clearance exceeds this limit, replace the bearing. 7. **Apply New Grease**: After cleaning, apply fresh grease to the bearing and place it back into the hub. 8. **Reinstall the Hub and Adjust the Nut**: Place the hub and outer bearing back onto the journal. Hand-tighten the adjusting nut, then tighten it using a torque wrench according to the manufacturer’s specifications. After tightening, rotate the hub several times to check for smooth operation. There should be no axial play, and the hub should turn freely. 9. **Grease the Hub Cavity**: Apply a thin layer of grease to the hub cavity and the shaft cap to prevent rust. Avoid overfilling, as too much grease can cause overheating and affect braking performance. 10. **Reassemble the Components**: Reinstall the lock ring, fixing nut, tire, dust cover, and hub cover in the correct order. 11. **Test Drive**: After installation, drive the vehicle for about 10 km. Then park and check the temperature of the hub. If it feels hot, the bearing may be too tight. Adjust the tightness accordingly. --- ### **Protection of Pump Bearings** 1. **Lubrication**: Use high-quality grease for rolling bearings. After 1,500 hours of operation, replace the grease. The amount should be between 1/2 to 2/3 of the bearing chamber volume. Too much or too little grease can cause overheating. 2. **Initial Operation**: For new pumps, replace the grease after 100 hours of operation, and then every 500 hours thereafter. 3. **Storage of Lubricants**: Keep containers of grease or oil clean and sealed. Avoid contamination from dust, metal shavings, or other debris that could damage the bearings. 4. **Grease Selection**: Sodium-based grease is commonly used for motor bearings because it can withstand high temperatures (up to 125°C). However, it dissolves easily in water, so it should not be used for water pump bearings. 5. **Proper Lubrication Technique**: When adding lubricant, ensure it fills the bearing chamber properly. Apply a thin layer to the inner cavity and shaft cap for rust protection. Do not overfill to avoid heat buildup and poor performance. --- ### **Related Bearing Knowledge** The main purpose of angular contact ball bearings is to analyze the heating method of rolling bearings. FAG high-precision bearings clarify the negative impact of the depth of the deep groove ball bearing groove on motor performance. Bearing box floating labyrinth oil seal. --- This article links to http:// Please reference the China Bearing Network: http:// Previous: The Method of Tight Cooperation of Bearing Outer Ring Next: Five Key Features of Axial Compressors

Rotary Rings

Rotary Rings are a type of rotating seal widely used in various rotating equipment, such as rotary joints, rotary couplings, rotary connectors, etc. Its main function is to prevent liquid or gas leakage and maintain the normal operation of the equipment. In different applications, the material, structure, sealing method, size, etc. of Rotary Rings vary to adapt to different working conditions.

1. Material classification

The materials of Rotary Rings are mainly divided into two categories: metallic and non-metallic.

1. Metal materials

Metal materials mainly include stainless steel, steel, copper, aluminum, etc., which have characteristics of high strength, corrosion resistance, wear resistance, and are suitable for rotary seals in harsh environments such as high temperature, high pressure, and high-speed.

2. Non metallic materials

Non metallic materials mainly include ceramics, silicon carbide, graphite, etc., which have characteristics such as high hardness, high wear resistance, and low friction coefficient. They are suitable for rotary seals under conditions such as low temperature, low pressure, and high speed.

2. Structural classification
The structure of Rotary Rings is mainly divided into three types: unidirectional rotation, bidirectional rotation, and rotational stationary.
1. Unidirectional rotating structure

The Rotary Rings with a unidirectional rotation structure can only rotate in one direction and are suitable for devices with only unidirectional rotation.

2. Bidirectional rotation structure

The Rotary Rings with a bidirectional rotation structure can rotate in two directions, suitable for devices that require bidirectional rotation.

3. Rotating stationary structure

The Rotary Rings with a rotating stationary structure are composed of a rotating ring and a stationary ring. The rotating ring contacts the stationary ring during rotation to achieve sealing, suitable for equipment that requires a rotating stationary seal.

3. Classification of sealing methods

The sealing methods of Rotary Rings are mainly divided into mechanical sealing and liquid sealing.

1. Mechanical seal

Mechanical sealing is achieved through the contact surface between the rotating ring and the stationary ring, which has the characteristics of high reliability, long service life, and simple maintenance. It is suitable for rotary sealing in harsh environments such as high speed, high temperature, and high pressure.

2. Liquid sealing

Liquid sealing is achieved by injecting liquid between the rotating ring and the stationary ring, which has the characteristics of good sealing performance, low friction coefficient, and preventing dry friction. It is suitable for rotary sealing under low speed, low temperature, low pressure, and other conditions.

4. Size classification

The size of Rotary Rings is mainly determined by the equipment requirements, including inner diameter, outer diameter, thickness, shaft diameter, etc.

Rotary Rings, as an important type of rotary seal, are widely used, with different materials, structures, sealing methods, dimensions, etc. to adapt to different working conditions. When selecting Rotary Rings, it is necessary to make the selection based on specific equipment requirements to ensure the normal operation of the equipment.

Rotary Seals,Rotary Lip Seal,Rotating Shaft Seal,V Seals

DG Zhongxingshun Sealing Products Factory , https://www.zxs-seal.com