# The Function and Maintenance Methods of Forklift Thermostats

The function of a forklift thermostat is to automatically regulate the circulation of coolant in the radiator, so that the coolant in the water jacket maintains a certain temperature. The thermostat is installed in the cylinder head outlet pipe and consists of an expandable brass coil tube and two water valves. The tube contains a low-boiling-point ether solution. When the temperature is below 70 degrees, the water valve leading to the radiator closes, and the hole leading to the water pump opens. The water in the water jacket can only flow into the water pump through the bypass water hole for a small circulation. When the temperature is above 70 degrees, the thermostat valve opens, and the coolant in the water jacket can flow through the valve into the radiator for a large circulation. Therefore, the thermostat can ensure the optimal operating temperature of the engine. 1. Through forklift engine inspection, if the engine cannot rise to the specified value within the specified time (10 min) after starting, it indicates that the thermostat has been damaged. 2. Remove the thermostat, place it in a container filled with water and gradually heat it. With the help of an accurate thermometer, measure the water temperature and record the water temperature when the thermostat valve begins to open and when it is fully open. The temperature should comply with the scale reading on the upper surface of the thermostat. Generally, a good thermostat should begin to open at 68-72 degrees and should be fully open at 80-83 degrees. After the above inspection, if the thermostat does not work properly, it should be replaced.