1. The forklift battery has power, but it cannot start. The starter motor does not respond when the key is turned on. Repair method: Check whether the starter is faulty, the circuit or battery is not in good contact, and whether there is insufficient overcharging. Check whether the fuse is normal and whether the key switch is in good condition. If the previous points are normal, measure and check whether the battery power is higher than 12.5V. If the battery is aging, replace it with a new one.

2. The forklift has power, oil or gas but still cannot start. Repair method: First, open the engine hood, pull out the central high-voltage wire of the distributor, turn on the ignition switch at a distance of 6 or 7 mm from the cylinder body, and then turn on the ignition to rotate the crankshaft to check whether the high-voltage wire generates electric sparks. Then remove all the spark plugs to check if they are damaged. If it is a diesel vehicle, check whether the high-pressure oil pump is spraying normally and whether the injector nozzle is atomizing normally.
3. If there is no spark, check the circuit. The reason is that the low-voltage circuit is short-circuited, open-circuited, or the ignition coil or central high-voltage line is faulty. You can alternately open and close the contacts to observe whether the multimeter pointer or digital reading is normal. If the ammeter indicates a discharge of 3~5A and swings intermittently, it means that the low-voltage circuit is good and the fault occurs in the high-voltage circuit; if the ammeter pointer does not swing, it indicates that the low-voltage circuit is open-circuited; if the ammeter discharges a large current, it indicates that there is a grounding fault in the low-voltage circuit. If it is a diesel vehicle, check whether the solenoid valve of the high-voltage diesel pump is working properly and whether there is normal voltage coming to the solenoid valve. If not, check the circuit and insurance. 4. If the spark is too strong and produces blue-white sparks, it means that the low-voltage circuit and ignition coil are good, and the fault is in the distributor and spark plug high-voltage circuit. Remove the high-voltage wire head from the upper end of the spark plug, shake the crankshaft to test the engine body. If there is no fire, check the distributor head, distributor cap and high-voltage distributor for leakage. If there is spark, check the ignition timing and the working condition of the spark plug.

5. When the forklift starts the engine, the engine rotates but cannot be started. Maintenance method: First check whether the oil circuit and circuit are normal. The inspection method is as above. If normal, the compression ratio in the piston is too small, or the gasoline and air are not mixed and atomized well, or there is a problem with the carburetor. The diesel vehicle may have poor atomization of the injector nozzle. Check the preheating plug first and then start.

6. If the 7 ton forklift engine rotates, but the rotation is uneven, it means that the starter motor is worn and dragged. Replacing a new starter motor can solve the problem.

7. The battery is dead. Maintenance method: Check whether the battery has power. Failure to start the engine may be caused by a lack of power or the expiration of the battery life due to reasons such as the headlights not being turned off for a long time. Generally, the battery should be replaced in time according to the maintenance manual, or the battery of another vehicle should be connected to start the engine. After the engine can start, check whether the power generation of the generator is normal and whether the magnetic field of the generator is sufficient. Measure the power generation at idle speed and increase the throttle to see if it changes within the normal value.

Eighth, the oil supply system cannot supply oil and the pressure is too low. Maintenance method: Check whether the forklift oil dipstick or oil gauge has enough oil. If the oil gauge shows that it is below the red line, it will naturally fail to start the engine. Refill it in time. Pay attention to the quality of the oil when replenishing it, and try to choose good quality. If it is a gas car, check whether the gas path is unobstructed.

Ninth, some cars are equipped with a seat switch. If the driver does not sit on the seat of the forklift, the car cannot be started. Such a device is to prevent no one from being in the driving position, which may sometimes cause accidents in which the forklift accidentally injures people.

Ten, the wrong gear is engaged. When starting an automatic transmission car, the gear must be in the middle neutral position. If it is in the forward or reverse gear, it will not start. Before starting the car, turn the key to the ON switch, then turn it back, and then turn it to the start switch to ignite. If you turn the key switch normally, it is best to turn it within 5-6 seconds, and no more than 10 seconds at most. If it takes too long, stop and rest first and then start it again.