1. Internal combustion engine system
Adjust the center distance of the pulley so that the belt tension is appropriate to ensure that the driven pulley does not slip or lose rotation. Make sure that the pipes between the cylinder liners of the internal combustion engine are unblocked. Replace the faulty thermostat. Adjust the ignition time of the internal combustion engine to make it burn normally. As the pump displacement increases, the amount of water flowing through the radiator per unit time increases, and the heat dissipation increases. The pump displacement depends on the pump speed, the pump speed depends on the speed of the driven wheel, and the speed of the driven wheel depends on the diameter of the driving wheel or driven wheel. Therefore, we always want to increase the pump speed, but if the pump speed is too fast, the service life of the pump will be shortened. When the pump draws air, the efficiency of the pump decreases, but the heat dissipation capacity decreases. Therefore, under the condition that the water flow in the pump inlet pipe does not exceed 3m/s, the pulley diameter can be appropriately increased to increase the pump discharge.
2. Radiator system
Improve the welding quality and prevent the occurrence of desoldering or false welding. Take care not to touch the radiator fins when transporting, assembling and using the radiator. Tube with radiator core can also be selected. Practice has proved that the radiator core has strong heat dissipation capacity, simple manufacture, light weight, low cost, but poor structural stiffness. Increasing the heat dissipation surface area of the radiator will inevitably increase the heat dissipation. Increase the front area of the radiator, reduce the spacing between fins and tubes along the front and thickness direction of the radiator, and thicken the radiator to increase the heat dissipation surface area. However, the latter measure had little effect.
For example, if the radiator thickness increases by 50%, its heat dissipation will increase by 15%, while if the radiator thickness increases by 100%, its heat dissipation will only increase by 20%. According to the formula L=A0/A (where: L is the thickness of radiator; A0 is the total heat dissipation area of radiator; A is the front area of radiator; the volume coefficient of radiator compactness), increasing the front area of radiator can reduce the thickness of radiator, while decreasing the thickness of radiator can reduce the ventilation resistance, increase the air flow through radiator, and greatly improve the heat dissipation capacity. Adjust the distance between the fan and the radiator. For different forklift cooling systems, the better distance between the fan and radiator is different. Only by finding a better distance through experiments can the potential and role of the cooling system be fully exerted to achieve better results.
3. Sector system

Measures such as increasing the fan diameter, increasing the number of blades, increasing the installation angle of blades, increasing the chord width of blades, increasing the larger circumferential speed of blades, and using convex blades can increase the ventilation and improve the heat dissipation performance. However, the blade installation angle cannot be too large. When exceeding a certain critical value, the wind direction of exhaust will gradually decrease with the increase of blade installation angle, while the radial exhaust will gradually increase. Radial exhaust cannot cool the radiator, only reheat forklift parts. At the same time, the fan speed cannot be too fast, because the power of the drive fan is proportional to the third power of the fan speed. If the speed is too fast, the power loss of the internal combustion engine is too large. The failure of the cooling system is the direct cause of the high temperature of the forklift. To solve this problem, three aspects need to be solved: internal combustion engine system, radiator system and fan system. Ensuring the pump displacement, improving the welding quality of the radiator, preventing the occurrence of desoldering or faulty welding, and improving the working efficiency of the fan are all good ways to effectively solve the problem of normal heat dissipation of the lpg gasoline forklift.