The road washing and sweeping truck has continuous operation for more than 10 hours every day, and the intensity of the operation makes the vehicle need regular maintenance. Although the technology for detecting and diagnosing faults in cleaning and sweeping truck is becoming more and more mature, there are still certain limitations in the causes of faults. At this time, manual search is required, and manual maintenance will inevitably have some misunderstandings. These misunderstandings still have a great impact on the washing and sweeping car, so special attention should be paid to the maintenance:

1. The engine water temperature is not afraid of high but not low. High water temperature does everything possible to find the cause, while low water temperature is considered normal. In fact, the low water temperature of modern engines is very harmful, which will cause insufficient combustion of the mixture, lower power, increase fuel consumption, and cause poor lubrication, and cause excessive emissions.

2. Larger valve clearance is stronger than smaller valve clearance. In fact, the valve clearance is large and the valve lift is not enough to open, resulting in insufficient intake or poor exhaust, which just reduces the engine power.

3. The more oil the better. It is believed that adding more oil to the engine is better than less, and adding less is easy to burn the bearings, and adding more oil does not matter. In fact, adding more oil will still cause harm to the engine, especially the inclined engine and the V-type engine. It not only increases the rotation resistance of the crankshaft and the connecting rod, but also increases the oil splashing on the cylinder wall, resulting in increased carbon deposits in the combustion chamber. Therefore, adding more oil will reduce engine power, increase wear and tear, and cause excessive emissions.

4. The lubrication of the hollow hub is unreliable. It is believed that the wheel hub is filled with grease to ensure the lubrication of the wheel hub bearing. The lubrication of the empty hub that is only coated with grease on the bearing is not safe. The gap between the hub must be filled with grease. In fact, this not only wastes grease, but also affects the heat dissipation of the bearing, which is harmful to the lubrication of the bearing.

5. It is better to have a larger contact gap of the breaker than a smaller one. In fact, the contact gap is too large and the contact closing time is short, so that the primary current of the ignition coil is reduced, and the high-voltage spark is weak, which makes the engine difficult to start.

6. Ignition advance angle or fuel injection advance angle. If the ignition advance angle is too large, it may cause deflagration. The engine produces deflagration, which greatly damages the piston, seriously affects its service life, and increases the starting resistance of the engine.

7. When cleaning and sweeping the car for maintenance, disassemble and inspect it before rest assured. With the improvement of the manufacturing level, the life of modern auto parts has been greatly extended, and random disassembly and inspection will inevitably destroy the already-run-in fit state and greatly shorten the service life of the parts. In today's day when the cleaning and sweeping vehicle failure detection technology is becoming more and more perfect, if there is no obvious failure of the component or assembly, it is generally not to be disassembled.

The above are some of the misunderstandings in the maintenance process of the cleaning and sweeping truck. No matter the size of the misunderstanding, it should be paid enough attention. Put an end to wrong maintenance and repair methods, and take good care of the truck.