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Choosing Hydraulic Oil Of Used Excavator ReasonablyTags: used mini excavators for sale digger sales2014-01-26
There are some tips for choosing hydraulic oil of used excavator that should be paid attention to. Firstly, it is the hydraulic oil viscosity. The principle to ensure the hydraulic oil viscosity is considering the working temperature of the hydraulic circuit and efficiency under the premise of making hydraulic oil viscosity optimum range of the used excavator. As well as corresponding to a short period of time to allow the highest leakage oil temperature 90℃ when the viscosity of 10×10-6mm2 per second.
Secondly, it is the viscosity index （VI）. The index of the used excavator reflects the changing characteristics of the oil viscosity change with the sticky temperature. If the viscosity index of the oil is higher, which means the kind of oil viscosity change with temperature and the degree is smaller; on the other hand, it will be larger. The anti-wear hydraulic oil viscosity index is VI≥110 produced by some famous manufacturers. The anti-wear hydraulic oil viscosity index is about VI=95 in domestic. The viscosity index of foreigner hydraulic oil and multi-grade engine oil is generally VI > 140. This point is important to be paid special attention of the clients who use large imported hydraulic excavator and the domestic hydraulic oil. The decreasing of the oil viscosity index of the used excavator makes the range of environment temperature become smaller than before. If it must be used, you should contact to the manufacturer to know related information to adjust the using range of the oil. Also should change equipment related settings if it is necessary.
Thirdly, it is the other comprehensive performance of the used excavator. Because of the working pressure of the hydraulic system from the modern large-scale hydraulic used excavator is a little higher. The allowed hydraulic oil with maximum working oil is about 90℃. In order to guarantee the hydraulic system to work normally in the changing period, the oil used for the system must with high quality of its lubricity, oxidation stability, rust corrosion, abrasion resistance and so on. Also a good hydraulic oil cooling system of the used excavator is necessary. For the large hydraulic used excavator, the improvement of the hydraulic oil cooling systems is different from different manufacturers. But its basic idea is the same.
Nowadays, there are two main control methods of the large hydraulic used excavator. The first one is the method with the function of pressure flow of limit load adjustment and inductive load adjustment. The major function of the CUT-OFF is to make the variable pump of swash plate Angle decrease when the working pressure of the system reaches the setting value. At the same time, to keep the pump of the used excavator only in the flow of "residual" needed to maintain the pressure state to avoid any overflow valve from overheating.
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