Proper disassembly of NSK shaker bearings is crucial to avoid internal damage. Improper techniques can lead to contamination or misalignment during reinstallation, which may compromise the bearing's performance and lifespan. Therefore, when removing vibrating screen bearings, extreme care must be taken. The shaft should always be properly supported to prevent excessive force from damaging the bearing.
1. **Disassembly of the Outer Ring**
To remove the outer ring that has an interference fit, it's recommended to pre-install several screws around the housing. These screws are placed in screw holes on the outer ring and tightened evenly on one side to gradually push it out. In many cases, these screw holes are covered with blind plugs. For tapered roller bearings used in vibrating screens, the housing often features cutouts on the shoulder for easier disassembly using a press or tapping method.
2. **Disassembly of Cylindrical Hole NSK Bearings**
For bearings with cylindrical bores, the inner ring can be removed using mechanical pressure. It’s important to ensure the inner ring can withstand the pulling force. For larger shaker bearings, an oil pressure method is commonly used. Oil is injected through an oil hole in the shaft, making it easier to extract the inner ring. When dealing with wide bearings, a puller fixture is often used alongside the oil pressure system.
For NU and NJ type cylindrical roller bearings, induction heating is a popular method. By heating the inner ring quickly, it expands slightly, allowing for smooth removal. This technique is both efficient and minimizes the risk of damage.
3. **Disassembly of Tapered Hole NSK Bearings**
When removing smaller tapered hole bearings, an adapter sleeve is typically used. The inner ring should be supported by a block attached to the shaft. After loosening the nut several times, the bearing can be removed using a boring head and a suitable pad. This approach ensures controlled and safe disassembly without causing unnecessary stress to the bearing components.
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