1. Auditory Inspection of Abnormal Noise: Normal operation of the equipment involves a smooth and even sound. Sharp "squeaking" or "hissing" sounds usually indicate poor lubrication leading to metal-to-metal friction. Periodic "clicking" or "clunking" sounds may indicate wear on internal bearings or gears due to insufficient lubrication. If you hear these abnormal noises, it is recommended to stop the machine immediately for inspection.
2. Visual Inspection of Oil Level and Color: Observe the oil level using the oil level gauge to ensure it is within the appropriate range. Also, check the color and condition of the lubricating oil: New oil is usually transparent or light-colored and will evenly darken with use. If the oil turns black, cloudy, emulsified (whitened), or contains metal shavings, it indicates that the oil quality has deteriorated and needs to be replaced.
3. Touch Inspection of Temperature: After the equipment has been running for a period of time, touch its outer casing. If the temperature feels abnormally high (above 40°C or feels noticeably hot to the touch), it may be due to insufficient lubrication causing increased friction. However, be careful and avoid touching high-temperature parts.
Comprehensive Recommendation: During routine inspections, it is recommended that you establish baselines for normal equipment sound, fluid levels, and temperature to more readily detect abnormalities. Any rhythmic, harsh, or newly emerging abnormal noises should prompt an immediate stop and inspection.
