The reason why the excavator stalls, and what is the reason why the excavator stalls at idle?

Cause of failure] 1 Failure of the hydraulic pump.

2 Problems with two valves of the excavator.

3. The hydraulic pump regulator variable is chaotic, and the excavator will be shut down.

Whether the confluence valve of the solenoid valve is stuck.

5. If there is too much hydraulic oil, the excavator will also be out of flame.

If the fuel supply is not smooth, check whether the oil channel is blocked and leaking.

Corresponding Failure Reason].

1 There is a problem with the circuit.

Check the firewood to see if it's blocked, if not, look at the inlet system.

3 There is a problem with the engine.

4 There is water in the fuel line.

If air enters the fuel pipe, the excavator will shut down and fail.

6 Poor oil supply to the air hydrant causes the engine to stall.

7. The engine power is insufficient, and it is difficult to achieve the power required by the hydraulic pump.

The hydraulic part of the valve stem is stuck, and the excavator will hold the machine and turn off the fault.

The valve stem does not move smoothly, resulting in the power of the hydraulic part being greater than the output power of the engine, so the engine will stall.

Supplement] Corresponding fault repair:

1.Although you say that there is no problem with the inspection, it is recommended to start with the most basic fuel circuit cleaning and replacing all the filters. The diesel pump dismantles the oil outlet line to see if the fuel injection length can reach about 6 7cm.

2.The small arm and the walking are mainly oil supplied by the pump 2, and the regulator of the lower pump 2 is mainly checked and cleaned.

3.90% of the car is a fuel circuit fault, it is best to carefully check the oil circuit to confirm whether there is any air leakage, such as the pipe joint seal is damaged, the filter element is not in place, and the drain cover of the oil-water separator is not tightened. It is possible to use a direct connection to the tank test.

The following is summarized by the Guoxiang excavator maintenance master.

Common reasons for the failure of the excavator to stop the car: 1

There is a problem with the computer board of the Volvo excavator.

Or there is a problem with the solenoid valve of the excavator.

There is also the air filter of the excavator that is dirty or broken.

Volvo excavator engine oil circuit blocked.

Diesel ** is not enough, air intake.

The hydraulic oil strainer is clogged.

The mediator is stuck.

Further reading: Generally, the failure of Volvo excavator is due to the power of the hydraulic pump of the excavator is greater than the power of the engine, so it leads to the phenomenon of the excavator holding the car or even stalling. Therefore, after the failure occurs, it is necessary to first check whether the power of the hydraulic pump of the excavator and the power of the engine match.

The way to check can be to adjust the power of the excavator hydraulic pump a little less, and then see if the Volvo excavator is working normally If it is still not normal, it means that it is not a problem with the hydraulic pump, and the engine should be checked.

The excavator is idle and stalls, which is often caused by factors such as the fuel injector of the engine being too dirty or the fuel filter element being too dirty.

There are 8 reasons why the excavator holds the car as follows:

1. The engine power does not match the power of the hydraulic pump.

Brake failures are, of course, closely related to the engine, which is usually caused by a drop in engine power. If the engine power is lower than the power required by the hydraulic pump, then check the fuel system and air intake system for problems. In addition, problems with the oil pump can also lead to a decrease in engine power, which usually requires a school oil pump, replacement of the plunger nozzle, etc.

2. The engine air intake is insufficient.

When the excavator's engine is under-intake, it can also cause braking. There are many other reasons for insufficient air intake, such as severe wear and tear on the supercharger, clogged air filters, incomplete operation of the supercharger, and leaking exhaust manifolds. If necessary, the supercharger needs to be replaced.

3. Braking caused by heavy objects.

Insufficient engine oil** is also one of the reasons for excavators. When the engine is working under heavy load for a long time, the oil** will be insufficient. At this point, the pump flow can be adjusted to eliminate braking. Remember not to work under heavy load for long periods of time.

4. Petroleum issues.

The failure of the excavator brake is related to the oil. If there are too many oil impurities, the oil circuit will be blocked, the filter will be clogged, there will be too many impurities in the fuel tank, and the engine power will decrease. Long-term use of engine oil with large amounts of impurities can damage the excavator and cause braking.

Also, if the type of oil chosen doesn't match and mismatched parts are installed, it can cause braking. It is recommended that you choose regular attachments and high-quality oil.

5. Fuel system problems.

If the long-term use of low-quality oil will cause a large amount of impurities to appear at the bottom of the tank, the tank should be cleaned regularly to clean the position of the oil line and oil joint. In addition, the oil-water separator should not be overlooked. The drain valve at the bottom should be opened periodically to release water.

Otherwise, too much water storage will cause the excavator to move.

6. The dirt of the large pump regulator is caused by the brake.

When working for a long time and ignoring the grease formed around the large pump regulator, the regulator becomes clogged, causing the large pump regulator to not work properly, resulting in braking. At this point, you can remove it for cleaning or replacement.

7. The circuit is abnormal, and there is a car phenomenon.

The oil circuit inspection is very important, and the oil circuit must not be forgotten. Sometimes, when the circuit is abnormal, it causes the machine to brake. When braking, first check if it's an engine problem or a hydraulic system problem. If both are fine, check if the electrical components are abnormal.

8. Wear and aging of parts.

In the process of troubleshooting the excavator, the wear and tear of the components must not be overlooked. When there is no problem with the power of the engine and pump, you also need to check whether the engine cylinder liner piston is worn out, and the engine and other parts of the hydraulic system are leaking.

1. The working parts are clear and bright and blocked, causing the excavator to turn off by itself.

It is manifested as a gradual decrease in engine speed and black smoke from the exhaust pipe before the ignition, and in this case, the excavator should first check whether the working parts of the excavator are blocked. If there is a blockage, the engine can generally be restarted after the blockage has been cleared. In addition, due to poor lubrication, the engine presents a shaft burning accident, which will also produce this phenomenon, in this case, the engine needs to be overhauled.

The reason why the excavator turned off on its own.

2. The excavator stalls by itself due to poor engine fuel.

It is manifested that the engine speed is unstable or slows down before the machine stalls, but there is no obvious black smoke from the exhaust pipe. In this case, you should check whether the fuel in the fuel tank is exhausted, whether the fuel supply of the fuel pump is normal, whether there is any debris blocking at the oil inlet of the sedimentation cup, and whether the diesel filter is too dirty. If the diesel filter is too dirty, remove the diesel filter, clean it and reinstall it, and remove the air from the oil circuit.

The reason why the excavator turned off on its own.

3. The excavator will turn off by itself due to the sudden interruption of the engine oil supply or the sudden increase in the wide load.

There is no process of speed reduction before the excavator is turned off, and it is suddenly extinguished. In this case, the engine parts should be checked first to see if they are suddenly loose or fall off, and for the engine with the high-pressure oil pump oil supply rod controlled by the flame-out solenoid valve, it should also be checked whether the flame-out solenoid valve is powered off, and the excavator is the reason for the fire on its own.