First, adjust the carburetor, reduce the oil level of the float chamber, and reduce the oil output of the main nozzle and the fuel saver. Appropriate delay of ignition advance angle; fuel pipes, filters, gasoline engines and carburetors of fuel injection and washing systems; pumps, nozzles and all pipes of diesel engines to adjust carburetors of gasoline engines or pumps and nozzles of diesel engines; preheating devices on intake/exhaust manifolds should be adjusted to the "summer" position.

　　2. Check the density of electrolyte and the height of liquid level frequently. The density of electrolyte is smaller than that in winter. Replenish steaming water in time and keep ventilation holes open. Appropriate adjustment of forklift generator regulator, appropriate reduction of charging charger, voltage, and clean regulator contacts; adjustment of forklift battery electrolyte density (appropriate reduction).

　　3. Correctly adjust the ignition system components, such as the spark plug clearance (appropriately increased) and the break-off contact clearance (appropriately increased) of the distributor in the gasoline engine. The ignition time should be properly delayed, and the coke deposited on the spark plug should be removed to prevent detonation.

　　4. Strengthen the inspection of tires. In summer, the pavement temperature in the south is often above 70 degrees. The tires of forklift trucks are prone to burst because of heating and the increase of pressure in the tires. In high temperature environment, tyre temperature must be checked regularly to prevent tyre temperature from being too high. If necessary, forklift truck should be parked in a cool place to cool down, and then continue to run until tyre temperature is low. It is absolutely impossible to cool down by sprinkling cold water or deflating air. Pay attention to inflating the tire according to the prescribed standard and keep the contact pressure normal.

　　5. Improve the heat dissipation device and enhance the cooling intensity. Check the sealing of the cooling system, the tightness of the fan belt and the working condition of the thermostat, and ensure that the system has sufficient cooling fluid. Clean the scale of cooling system (radiator, water jacket). When the engine parts are overheated and the water tank is boiling, stop and cool down in time, and pay attention to not extinguishing, so as to prevent the engine from overheating and cylinder pulling accidents.

　　6. In hot summer, engines should be replaced with lubricants with higher viscosities, transmission and differential should be replaced with heavy gear oil, and oil-changing cycle should be shortened. When forklift wheel hub bearings are replaced with grease with higher dropping point, inspection and maintenance should be carried out in accordance with the prescribed period.