2011-06-24
How to deal with high water temperature of Kato 307 excavator? usuallyexcavating machineryThere are generally three situations where high water temperature occurs:
The water pump is broken. After removing the thermostat, check if the water in the water tank is circulating. If it is not circulating, it means that the water pump is broken.
The two thermostats are stuck. Remove the thermostat and try it out. If the water temperature is not high, then the thermostat is broken.
If the water tank is dirty, remove it and rinse it in a professional place.
Perhaps these situations do not match your situation, so you can take a lookSumitomo 60 excavator has high water temperatureHow was it resolved. This article introduces more solutions for situations where excavator water temperature is high.
What should be done when encountering high engine oil and water temperatures during excavator construction? If the quantity of oil and water is sufficient or insufficient, the oil temperature should be lowered first and then the water temperature should be lowered for the following reasons.
The so-called high temperature of excavator engine refers to the oil and water temperature of the engine exceeding 90 ℃. When both temperatures are too high at the same time, it will affect the normal operation of the engine and cause certain harm to the engine. Due to the high or low water temperature, it mainly indicates the thermal condition of engine combustion and high-temperature parts such as pistons and cylinder walls. Therefore, excessive water temperature can lead to deterioration of combustion conditions, thermal expansion of high-temperature parts, reduction of clearance between the piston and cylinder wall, and severe wear or "cylinder pulling". The oil temperature mainly indicates that the crankshaft and bearings generate heat due to friction, while the engine oil dissipates most of its heat. The balance between heat generation and heat dissipation (manifested as stable oil temperature) is relative. When the heat generation exceeds the heat dissipation, the temperature of the bearing will rise, and the local temperature will reach the melting point of lead, causing the lead in the bearing to melt and precipitate. After a large amount of lead precipitation, the bearing surface of the bearing shell becomes smaller and uneven, which exacerbates wear. In severe cases, the local temperature can exceed the melting point of copper (1083 ℃), and copper begins to melt, ultimately leading to severe erosion of the crankshaft and bearings or the consequence of "bearing hugging the shaft". According to the experiment, when the oil temperature reaches 110 ℃, the oil film temperature in the bearing clearance can reach 150 ℃. If the oil film temperature exceeds 150 ℃, it is prone to rupture and form semi dry friction. Due to the fact that crankshaft bearings are made of copper lead alloy, improper measures to reduce them can cause the bearing temperature to become too high and lead to melting and precipitation, with unimaginable consequences. Therefore, when the temperature of both oil and water is too high, the oil temperature should be lowered first.
The oil temperature is usually lowered by the method of "load reduction, low speed". At this point, although the heat exchange time of the coolant at the high-temperature parts is long, the water flow rate slows down, prolonging the heat dissipation time. At the same time, due to the decrease in load and speed, the heat generated by the friction of various moving parts also decreases accordingly. So, lowering the oil temperature not only reduces the heat generated by the engine, but also indirectly reduces the heat absorbed by the coolant, thereby slowing down the rate of water temperature rise.
When the engine oil temperature is too high, not only does it increase fuel consumption (leakage, evaporation, combustion), but it also affects the quality of the engine oil, making it difficult for the oil film on the friction surface of various engine components to form and maintain, resulting in the inability to establish oil pressure in the main oil passage and exacerbating component wear. The influence of water temperature on oil pressure can only be achieved through oil temperature. So, it has a certain degree of indirectness and requires a certain amount of time.
As is well known, precipitation temperature is generally achieved through the method of "reducing load and increasing speed". When the speed is too high, it will increase the inertia force and centrifugal force of the piston connecting group, causing an increase in the load on the crankshaft bearing. At the same time, the relative friction speed between the journal and the bearing shell will also increase, resulting in an increase in the heat generated per unit time, a decrease in the oil pump oil volume, and a large amount of oil being thrown out of the main oil passage, leading to increased wear on the friction surfaces of various components due to insufficient lubricating oil, and further increase in oil temperature.
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