How to Tell if Lubricant Needs to Be Changed
Source: Bearing Network | Time: 2014-04-26
Lubricating oil that has degraded often appears dark black, foamy, or emulsified. When rubbed between your fingers, it should not feel sticky, and it should not have an unusual odor. If you drip a few drops onto a piece of white paper, the spot should be dark brown with no yellow oily area or black spots. If you don’t replace the lubricant in time, it can accelerate component wear, reduce service life, and even lead to serious safety issues. Therefore, regularly checking whether the lubricant needs to be changed is crucial. Here are several simple methods to identify whether the lubricant has deteriorated: 1. **Oil Flow Test**: Take two measuring cups. Fill one with the lubricant and place the other on the table. Lift the filled cup about 30–40 cm above the table and tilt it slowly so the oil flows into the empty cup. The oil should flow smoothly, evenly, and continuously. If the flow is inconsistent, slow, or irregular, it may indicate that the lubricant has degraded. 2. **Hand Rubbing Method**: Rub a small amount of lubricant between your thumb and index finger. A good lubricant should feel smooth and have minimal friction. If there’s a gritty or sandy feeling, it suggests the presence of impurities, and the lubricant should be replaced immediately. 3. **Light Inspection Method**: On a sunny day, use a screwdriver to pick up some lubricant and hold it at a 45-degree angle relative to the horizontal. Expose it to sunlight and observe the oil droplets. If there are no visible wear particles or debris, the lubricant is still in good condition. However, if you see a lot of debris, it’s time to change the lubricant. 4. **Filter Paper Test**: Place a few drops of lubricant on a clean white filter paper and wait for the oil to seep through. If you see black powder or feel resistance when touching the spot, it indicates the presence of impurities. A good lubricant should leave a dry, yellow stain without any residue.
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