When the excavator is working normally, the color of the exhaust gas is colorless or light gray, and it should be dark gray when working under load. Generally, if there is black smoke, then the engine system may be malfunctioning.
Details: A Komatsu PC130-8M0 excavator started to weaken after adjusting the pump a little, and there was a lot of black smoke from the excavator, and the powerless speed was also very slow.
The excavator is black and smokeless, and it has no power and speed.In general, one of them is insufficient air supply, insufficient fuel supply, insufficient power of the engine itself, excessive hydraulic pump flow, and pump control system problems.
Failure analysis and maintenance:
1. Oil circuit problem. The oil circuit is blocked, the oil is dirty, and the oil can not be supplied, and the machine will be held back, which will seriously cause the car to stall. Maintenance method: replace all diesel filter elements, and clean the oil-water separator. If it is replaced, there will be , Just check when you change the filter element, the oil out of the oil pipe is not big, is the oil urgent? The oil is not big, the oil pipe is blocked, and it is found that it is blocked, and then use the air pump we used to inflate to the oil pipe to inflate and flush Just open the dirt, and that's all.
The excavator is black and smokeless, and it has no speed.
2. Hydraulic problems. The pressure of the hydraulic pump will cause black smoke to hold the machine, generally the pressure of the front pump and the rear pump. The standard pressure of the new machine is 380KP, and it is usually adjusted to 320-310 if it has been worn for a few years. Left and right look!
3. The flow rate of the main pump. If the flow rate is high, the black smoke of the excavator will be held back, and the flame will be seriously turned off.If it is high, the flow rate of the main pump will be turned down. After the digging machine, there is no speed and weakness.
4. The problem of the oil pump. Generally speaking, it is not a problem of the oil pump. The oil pump is mainly weak and it is not easy to emit when the engine is running. There are black smoke at the high speed. These are some common problems that occur in the oil pump. It's good to calibrate the oil pump.
5. Electromagnetic valve circuit problem. Look at the LS-EPC valve on the monitor display board. Does the PC-EPC valve have current through? The specific parameters of the current are not very clear, so I will not say it. The internal mechanical parts of the solenoid valve are stuck Dead. For example, the spool of the LS-EPC valve, PC-EPC valve stuck, there is dirt inside.
