The driver knows that sometimes, especially in the summer, when the temperature of the tank of the internal combustion forklift is too high, it must stop, which will affect the progress of the forklift, and in serious cases, it will also damage the parts of the vehicle. What causes the forklift tank? High temperature? How to solve it? Xiaobian tells you:

What is the reason for the high temperature of forklift trucks?

There are many reasons for the high water temperature: temperature control switches, pumps, sub-fans, rusted pipes, poor return water and other factors can cause such phenomena. The engine water temperature is mainly related to whether the thermostat works normally, whether the water pump can establish enough pressure, and whether the cooling fan can reach the standard speed. How to check if the temperature of the forklift is abnormal? The cooling system is generally composed of elements such as a cooling fan, a radiator, and a thermostat. The cooling fan is often directly driven by the engine, and the fan speed is consistent with the engine speed. The control of the cooling water temperature mainly depends on the thermostat.

The principle of thermostat

Thermostat, also known as thermostat, is based on the cooling water temperature automatically adjusts the amount of water into the radiator, change the water circulation range, in order to adjust the cooling system's cooling capacity, to ensure that the engine works in the right temperature range. The thermostat must maintain a good technical state, otherwise it will seriously affect the normal operation of the engine. If the thermostat main valve is opened too late, it will cause the engine to overheat; if the main valve is opened too early, the engine warm-up time will be prolonged and the engine temperature will be too low. At this point, it can be judged whether the thermostat working condition is good. When the engine starts cold running, if the cooling water flows out of the water inlet pipe of the upper water chamber of the water tank, the main valve of the thermostat cannot be closed; when the engine is cooled When the water temperature exceeds 70 degrees Celsius, no cooling water flows out of the water inlet pipe of the upper water chamber of the water tank, which means that the main valve of the thermostat cannot be normally opened, and the repair is required at this time.

Thermostat inspection can be performed on the vehicle as follows:

First, after the engine starts the inspection: open radiator radiator cover, if the radiator cooling level is static, it indicates that the thermostat is working properly, otherwise, it indicates that the thermostat is working abnormally.

Second, this is because when the water temperature is lower than 70°C, the thermostatic expansion tube is in a contracted state and the main valve is closed. When the water temperature is higher than 80°C, the expansion tube expands, the main valve gradually opens, and the circulating water in the radiator starts. flow.

Third, when the water temperature indicator indicates below 70°C, if there is water flowing at the inlet pipe of the radiator and the water temperature is warm, then the main valve of the thermostat will not be closed tightly, so that the cooling water will be cycled prematurely.

Fourth, the inspection after the water temperature rises: The engine works early, the water temperature is thousands of quickly; when the water temperature indicator indicates 80, the heating rate slows down, then shows that the thermostat works normally. Conversely, if the water temperature rises rapidly, when the internal pressure reaches a certain level, boiling water suddenly overflows, indicating that the main valve is stuck and suddenly opens.

5. When the water temperature indicator indicates 70°C-80°C, turn on the radiator cover and the radiator drain switch to feel the water temperature. If all of them are hot, the thermostat works normally; if the water temperature of the radiator inlet is low, and the radiator is There is no water flow or water flow at the water inlet pipe of the upper water room, indicating that the thermostat main valve cannot be opened.

The water pump is the power that the cooling water continuously circulates in the cooling system. The factors affecting the water pump are the impeller and the belt. If the impeller is loosened, the cooling water cannot be circulated and the water pump is damaged. If the belt is too large, the water temperature is too high. Too small a belt may damage the water pump bearing and the generator bearing.

Fan air flow detection: A thin paper can be placed in front of the radiator. When the engine is running, if the paper can be blown open, the air flow is sufficient. This is different from the inward suction of the front-engined car fan. The blades cannot be installed in reverse, and the fan guards should be complete and effective.

For radiators, the chassis of the forklift is lower and the radiator is placed at the rear of the vehicle. Dust can easily accumulate on the surface of the heat sink. If it is not cleaned in time, it will seriously affect the heat dissipation effect. Cooling water Do not use "hard water" to prevent scale buildup in the radiator, resulting in insufficient addition of cooling water.

Xiaobian reminds everyone that when you drive a forklift, you should pay attention to it and take precautions to avoid a bigger accident.

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