1. Sensory identification: There are obvious suspended metal particles in the oil, and you can directly feel the presence of fine particles when you knead it with your fingers; if there is a reflective flash point under the light, it means that the hydraulic components have been severely worn; If there is a large amount of metal chips deposited on the bottom of the oil tank, it means that the main oil pump or sawing machine motor has been severely worn.
2. Heating identification: For hydraulic oil with low viscosity, it can be directly put into a clean and dry test tube to heat up.If sediment or suspended matter is found in the oil in the test tube, it means that the oil has already contained mechanical impurities.
3. Filter paper identification: For hydraulic oil with higher viscosity, it can be diluted with pure gasoline and then filtered with clean filter paper.If a large amount of mechanical impurities (metal powder) are found on the filter paper, it means that the hydraulic oil components of the sawing machine have been severely worn.
4. Sound identification: If the entire hydraulic system has large and intermittent noise and vibration, at the same time the main oil pump makes a "buzzing" sound, or even the phenomenon of "crawling" of the piston rod, this is to observe the liquid level of the oil tank and the oil pipe Outlet or transparent level gauge, you will find a lot of foam.This situation shows that the hydraulic oil used by the sawing machine has invaded a large amount of air.
