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Possible oil contamination, internal wear, or improper maintenance.

Solution: Replace hydraulic oil, replace worn components, perform regular maintenance.

Abnormal exhaust smoke can indicate various engine issues:

1. Black smoke: 

Check for clogged air filters, over-fueling, or issues with the fuel injectors. Inspect the turbocharger (if equipped) for damage.

2. Blue smoke: 

Indicates oil burning. Check for worn piston rings, valve seals, or a damaged turbocharger.

3. White smoke: 

Can be caused by coolant entering the combustion chamber. Inspect the cylinder head gasket, cylinder head, and cooling system for leaks. Additionally, ensure the fuel injectors are operating correctly and not causing unburned fuel to emit as white smoke.

8 reasons for the engine speed drop of the excavator, 6 solutions are here!

As the name suggests, engine speed drop means the failure of the engine speed drop during the operation of the excavator. There are two manifestations of speed drop, one is a slight speed drop within 200 revolutions, and the other is a serious speed drop above 300 revolutions, which is likely to cause the excavator to suddenly shut down. There are 8 main reasons for the engine speed drop of the excavator.

1. The diesel oil circuit of the excavator is faulty. Generally speaking, when the diesel oil circuit is blocked, it may cause the speed drop phenomenon.

2. The hydraulic system of the excavator has a fault, so that the hydraulic pump cannot change the displacement normally, causing the system pressure to be too high, and the speed drop may also cause a machine failure.

3. The output power of the excavator engine itself is insufficient, the output power is lower than the rated power, and the speed is too low. There is also a problem with the main pump.

4. The engine uses fuel of poor quality or the water content of the fuel is too high, which will lead to insufficient engine power and speed drop.

5. When the air intake system leaks or is blocked, the engine will be short of air supply, resulting in incomplete combustion of fuel, and there will be speed drop and black smoke failure.

6. Due to the large gap of the solenoid valve, the fuel supply is insufficient, which causes the engine to drop.

7. The joint of the fuel supply circuit of the fuel system is loose or the pipeline is broken, causing fuel leakage or foreign matter blockage, resulting in insufficient fuel supply. In addition to speed drop, it may also cause flameout.

8. There are many reasons for speed drop, such as incorrect valve clearance, wrong injection timing, damaged turbocharger, faulty brakes, etc.

Having said so many reasons for the speed drop of the excavator engine, what should we do when the speed drop occurs?
The solutions are all here!

1. First, check whether the diesel used in the excavator is deteriorated, whether there are impurities in the oil, and whether the oil circuit is blocked.

2. Check the valve clearance of the excavator engine and the speed of the engine.

3. Check the intake pipeline, clean the air pre-filter and air filter element, and start the engine again.

4. Check whether the speed drop of the excavator occurs when the engine is under load?

5. Carefully check the engine to see if the engine failure causes the speed drop of the excavator engine.

6. In addition, the electronic control, hydraulic system, fuel system, etc. need to be checked.

There are usually the highest and lowest oil level marks (MAX and MIN) on the inner wall of the oil filling port of each engine. This means that the oil level cannot exceed MAX or be lower than MIN.

A lower oil level, that is, a decrease in the amount of oil in the engine, will increase the oil load, causing the oil to become more seriously contaminated by heat, which not only weakens the lubrication performance, but also increases the fuel consumption. Because the less oil in the engine, the higher the oil temperature; and the higher the oil temperature, the greater the fuel consumption will be as the oil temperature rises. It is very dangerous to run the engine when the oil level is at the lowest point (MIN).

Keeping the oil level at the highest point (MAX) all the time will cause the oil to foam and lead to insufficient lubrication, resulting in serious wear. Foaming oil will also increase fuel consumption.

Therefore, it is recommended to keep the engine oil level between the MAX and MIN marks at a position close to one-third of the MAX.