Thermostat is an automatic temperature regulating device. It usually contains temperature sensing components, which open and close the flow of air, gas or liquid by thermal expansion or cold contraction. It is a valve that controls the coolant flow path. The thermostat is generally composed of springs, rubber hoses, temperature sensors, thermostat valves, valve seats, push rods, upper and lower supports, etc. Its function is to automatically adjust the amount of water entering the radiator according to the change of coolant temperature. At the same time, it will also change the circulation range of water, which is often referred to as "large circulation" and "small circulation". In this way, the heat dissipation capacity of the cooling system is adjusted, so as to ensure that the engine works within the appropriate temperature range. This article will summarize how to check whether the thermostat is installed correctly after the engine is running. As different brands of excavators have different requirements, this article is for reference only.
1. After the engine is started, open the water filler cap of the radiator and observe whether the coolant is calm. If it is calm, it indicates that the thermostat is normal. Otherwise, it indicates that the thermostat fails. Note that the temperature of the water thermometer should be measured when the main valve of the thermostat is closed. Otherwise, it will affect the process of judging the thermostat.
2. The other part will be checked after the engine water temperature rises and the main valve of the thermostat is opened. At this time, we need to pay attention to the changes of the water temperature gauge. If the water temperature reaches the opening condition of the thermostat main valve. If the heating rate of the coolant slows down, it indicates that the thermostat is working normally. If the temperature rise rate of the coolant has been very fast, it will cause the coolant to boil and suddenly overflow. It means that the main valve of the thermostat cannot be opened normally, and the thermostat should be replaced or repaired at this time.
