In winter, the engine is in a lower ambient temperature, and there is a small amount of condensate in the intake and exhaust systems due to the temperature difference. When the equipment starts cold, part of the fuel is not fully burned, and unburned oil vapor and moisture form steam and exit the engine. At this time, the external temperature of the engine is low, and the steam quickly liquefies, causing the exhaust gas to appear white when starting.
A Hitachi ZX360H-3G cool machine is not easy to start, the hot car is good to start, and the excavator still emits white smoke at idle speed, what is the reason?
Failure analysis:
1. The water temperature sensor is aging or working abnormally. It is caused by poor atomization of the nozzle.
2. White smoke is emitted when the excavator is idling. Check whether the white smoke is burnt or odorless. If it is burnt, it may be that the belt is too tight. Including the generator belt and the power steering pump air conditioning belt. The load of the motor during the big taxi is low, so it is not easy to start. After the car is hot, it will become larger due to thermal expansion and contraction away from the belt, so it is easy to start. White smoke is caused by the friction between the belt and the pulley.
3. If it is odorless white smoke, it may be caused by water leaking from the water tank and evaporating on the engine body. Due to the poor water circulation in the engine, there is air.
Related Reading:
Hitachi ZX360H-3G excavator engine lack of oil and flameout, what is the impact? Generally speaking, diesel engine lack of oil will not flameout. It is the lack of diesel flameout, add oil, and just drain the air.
What caused the slow movement of the Hitachi ZX360H-3G excavator? How to repair it? The main reason may be that the pilot control oil line pressure is too low. The main pump pressure or flow rate is lower than the standard. The hydraulic oil path is not smooth, and the hydraulic oil filter element is Blocked. The hydraulic oil filter element is blocked, the copper mesh is dropped, and there are many impurities in the hydraulic oil tank. The cause of the failure is "the hydraulic oil filter element is blocked." The pressure of the self-reducing valve is measured, and the internal copper filter is blocked. The oil has been emulsified and deteriorated, there is moisture and some impurities in it. The solution is to clean the hydraulic system 2 to 3 times, and replace the hydraulic oil and filter element.
