Many excavator repair masters have encountered engine failures, and many masters can solve engine failures by themselves, but many of them feel complicated when they see engine failures. In fact, engine failures are not inconvenient, and many of them are attributed to false failures. The old driver listed the main manifestations of several types of engine failures for everyone to analyze in depth how to treat them.
1. Failure phenomenon: What is the problem of excessive use of engine oil in excavators?
Failure judgment: true failure.
Free online maintenance for excavators: Excessive oil usage is generally due to the following reasons: oil enters the combustion chamber to participate in ignition and oil seepage occurs. Engine oil can be cascaded into the combustion chamber, the root cause is that the engine parts are seriously damaged and the gap is too large, or the oil working pressure is too high. The root cause of water seepage in engine oil is that the gasket is hard and brittle and the cylinder is stuck. When the failure occurs, immediately go to the excavator repair shop to carry out repairs.
2. Trouble phenomenon: I suddenly felt the engine noise has increased recently. When the oil is not moved on the spot, there will be a loud noise of "rumbling", and the car body will have a significant sense of vibration.
Fault judgment: application fault.
Free online maintenance of excavators: raise the car and check if the bottom fender of the engine has bumps or bumps. Generally, the bottom fender is deformed after being hit by a moderate to severe bump, causing the bottom fender and the engine oil pan to be too close. When the oil is added, the two touch each other, causing noise and vibration of the car body. Solution: Remove the mudguard at the bottom of the engine and carry out the smoothing effect. When crossing bad roads or large roadblocks on the ground, be careful to drive safely, bypass the bad roads and avoid the bottom of the excavator.
3. Trouble phenomenon: It is difficult to start a cold engine car. The engine vibrates greatly after starting, and it can be repaired and stabilized after a while, but if the engine is still trembling when driving in a low speed gear, such a thing will happen when driving at a high speed. Faded.
Failure judgment: true failure.
Free online maintenance of excavators: Generally, such a thing is an ignition coil failure. If it is not for an ignition coil failure, it can be distinguished as the ignition time is too early. If the ignition time is too early, the combustion chamber of the engine may explode, which may cause the engine to vibrate more severely when driving at a medium speed or a lower gear. In the event of the failure, immediately go to the excavator repair shop for maintenance.
4. Trouble phenomenon: The engine is unstable, and there are often "sudden and sudden" noises. When the oil is increased, the engine will have insufficient driving force, and sometimes there will be "Peng, Peng" similar to the sound of a gun. , The exhaust pipe will show black smoke from the exhaust pipe.
Failure judgment: true failure.
Free online maintenance of excavators: There may be cases where the ignition time is too late, the working pressure of the combustion chamber is not high, and the driving force of the engine is reduced. Part of the ignited swelling mixed gas causes the quenching phenomenon, and a strong "Peng, Peng" sound will be heard, and the incompletely ignited mixed gas will emit black smoke from the exhaust pipe.
When the failure occurs, immediately go to the nearby excavator repair shop to carry out maintenance.
V. Failure phenomenon: When the excavator is driving normally and safely, the engine temperature suddenly appears, and the water temperature meter will display information to be 100 degrees. Is this all normal?
Failure judgment: true failure.
Free online maintenance of excavators: If the water temperature meter displays information that the scale will reach 100°C, the engine output power will be significantly reduced after the refrigerant is filled, which indicates that the mechanical structure of the engine is malfunctioning.
Most of the reasons for this failure are: serious water seepage in the water cooling system; damage to the cylinder gasket blocking the water jacket and the cylinder; the main gate valve of the thermometer falling; the cooling fan belt is loose or broken; the centrifugal water pump shaft and the centrifugal impeller are loose; the fan clutch These are not good at work. When the failure occurs, immediately go to the excavator repair shop for maintenance.
6. Trouble phenomenon: It didn't take long for the engine oil to be replaced soon, and it turned out to be black during inspection. What's wrong?
Fault resolution: false fault.
Free online maintenance for excavators: There are two key reasons for the blackening of the oil: firstly because of the effect of the quiet wetting agent, and secondly because the oil in the application is oxidized by air. If the engine oil does not change the black in the application, it indicates that the nature of this type of engine oil does not fully exert all its normal cleaning effects. Engine oil at this stage generally has a quiet wetting agent, which digests and absorbs the carbon deposits caused by ignition and the metal oxides of the engine oil, which is convenient to discharge when the engine oil is changed, thereby ensuring the internal cleaning of the engine. Therefore, the black oil that will be replaced soon is not necessarily caused by the dirty interior of the engine, but it can be changed according to the prescribed time.
7. Trouble phenomenon: The engine vibrates very seriously, and sometimes the fault indicator will flash. Should I go to the excavator for maintenance?
Fault judgment: false fault.
Free online maintenance of excavators: Some cars have engines like this, the engine shakes very seriously, and the engine failure indicator will flash. Many people suspect that there is a product quality problem. In fact, the real reason is not the fuel supply interruption caused by the cleaned fuel. It is likely to cause an accident to cause environmental pollution or blockage of the system software.
Completely clean the fuel supply interruption that is polluted by the environment, which is likely to cause accidents. The system software is constantly added with qualified car gasoline, and the fuel pipe cleaning fluid is added appropriately. If such things are improved, the fault can be cleared. Cardiovascular-engine of the machine. With the car’s travel schedule and the improvement of vehicle age, cardiovascular embrittlement is all normal. It must be noted that older excavators should pay more attention to the regular inspection and maintenance of the engine than new excavators. , Once there is noise or abnormal driving, the following basic self-examination and discrimination should be done:
1. Inspect the visualization of the engine compartment. Inspect the engine and its notes for oil stains and dust, especially at the junction of the cylinder head and the engine block, the connection of the oil filter element, the compressor, the power steering pump, the drive shaft of the excavator, etc. Is there any leakage in the fusion gap.
2. Check the oil consumption status: take out the oil dipstick to see if the oil on the dipstick is clean and crystal clear. The oil volume should be in the middle of the two scales.
3. Check the bottom of the engine compartment: whether the engine fender is intact or not. If the original factory has no fender, it can be considered for modification.
4. Check the refrigerant and brake fluid: Is the fluid level between the larger and smaller scales?
5. Check the engine running status: the cold car can be started within 5 seconds, and it can be started once or twice after ignition.
In fact, many engine failures can all be repaired by themselves. All excavator operators must penetrate the complex phenomena to understand the essence of the failure, and understand how to deal with such failures.
