What causes the excavator to slow down?

Excavator engine speed loss refers to the phenomenon that the engine speed of the excavator decreases during operation.

1. Symptoms of excavator engine speed loss:

1. Excavator engine speed loss slightly (within 200 rpm);

2. Excavator engine speed loss seriously Speed ??loss (above 300 rpm, which may cause the excavator to stall).

2. Reasons for excavator speed loss

1. Some vehicles use a solenoid valve (fuel cutoff) to control the oil circuit to cut off the oil, thereby achieving the purpose of stalling.

I once encountered a similar problem. The solenoid valve gap was too large, which was like the effect of turning off the flame and drawing half of the wire. Under load, the fuel supply was insufficient, so the speed dropped. The speed drop caused the diesel pump to supply insufficient fuel. This It's a vicious cycle that eventually leads to flameout.

2. The influence of temperature is relatively small. After all, there is a cooling device. The main influence of the environment is air pressure. For high-altitude areas, the air is thin, the oxygen content is low, and the engine combustion is insufficient, which affects the engine performance, but the air The supercharger also reduces the effects of high altitude.

The main reason that affects engine speed is the change of load. When the hydraulic system fails, the displacement cannot be changed, which can easily lead to speed loss or vehicle holding.

3. There are two main reasons for speed loss: engine performance is reduced, and there is a problem with the main pump. Check the engine and main pump.

You can take out the hydraulic filter element first and take a look. If you see a lot of copper powder on the filter element, there is something wrong with the main pump and you need to overhaul the main pump.

You can also enter the monitoring panel to check the engine speed. The minimum throttle idle speed is more than 1,000 rpm, the maximum throttle idle speed is more than 1,300 rpm, and the maximum throttle idle speed during operation is more than 1,900 rpm.

If there is no copper powder and the engine speed is normal, removing the two solenoid valves on the main pump and cleaning them will basically eliminate the problem.

4. If the engine output power is much lower than the rated power, then the simplest method should be used to judge at the construction site.

First check whether the fuel filter element is clogged, whether there is air leakage in the fuel line, whether the plunger, fuel injection head, and oil outlet valve in the fuel pump are seriously worn, whether the air intake of the air filter element is smooth, and whether the For engines with turbochargers, whether the turbocharger is damaged, whether the engine reaches high temperatures rapidly, and the oil viscosity drops, causing the cylinder wall to be laxly sealed and the compression ratio to decrease, whether the cylinder liner components are worn, causing serious air leakage in the cylinder, and whether the engine valves are laxly sealed. Etc., these are all factors that seriously affect engine power.

If the engine itself is excluded from insufficient output power, it is necessary to consider the matching of the flow rate of the hydraulic pump and the output power of the engine. More excavator-related knowledge, excavator jobs, excavator driver recruitment and job hunting, all in the driver hunting market wx.51pj.cc