We all know that the second-hand digging machine often has many faults during work for some troubles that are easy to occur. Here, we will give you a simple and convenient solution:
In the construction work, according to the load request of the operation, the speed is inversely proportional to the load (flow and pressure), that is, the product of the output pressure and the flow of the pump is a constant, and the output power of the pump is constant or approximately constant; If the pump control system presents a fault, the mobilization machine-pump-valve-load can not be well optimized in different working conditions, so that the excavator can not work normally, so we must control the excavator control produced by various manufacturers. system. Komatsu CLSS system, when dealing with faults, is also a simple and complicated analysis. The excavator is a machine-electric-liquid integrated product with high skill content. Therefore, when disposing the fault, generally start with the electrical system, check the hydraulic system, and finally check the mechanical transmission system. When checking the hydraulic system, the component is gradually reviewed from the help oil circuit - the control oil circuit - the main oil circuit.
First, the work speed is slow:
If it is a used Komatsu excavator that has been used for many years, the speed is gradually slower, which is caused by normal wear and tear. Important factors The wear of the whole machine causes the engine power to decrease and the hydraulic system to leak. This shows that a series of faults are manifested. Due to the internal energy consumption caused by the leakage, a large amount of heat energy is generated, so that all the systems are heated up agilely, and the viscosity of the hydraulic oil and engine oil is lowered. In order to make the whole system high temperature, the performance of the cool car is slightly faster and slower. This requires overhaul of the whole machine and repair and replacement of the parts with excessive wear. If the new excavator suddenly slows down, this must be simplified first and then, check from the following aspects: first check whether the circuit fuse is open or short; whether the pilot pressure is normal; servo control valve - servo piston is dead; the distributor confluence Trouble, etc.; eliminate other possibilities, and finally disassemble the hydraulic pump.
Second, the excavator is weak:
The machine is incapable of being divided into several aspects. First, the engine is rapidly decelerating when the external load is large, which means the following two aspects:
1. It is necessary to review the launching flexibility as described above.
2. It is to review whether the hydraulic displacement complies with the constant power output. That is, the swash plate angle is reduced to reduce the displacement without affecting the speed. Second, when the load is heavy, the engine does not slow down, and the system speed is normal; this requires debugging the system pressure. Because the pressures of the hydraulic cylinders specified by the hydraulic components and hydraulic systems of different manufacturers are different, as long as the manufacturer It is ok to stipulate the scale. In addition, if the pressure of the regulator relief valve is not adjusted, and when the relief valve is in good condition, it is necessary to check the adjustment system of the hydraulic pump, and even the cylinder block, the distribution plate, the plunger and the like of the hydraulic pump.
Summary: Common faults in general excavators are indicated in these aspects. With the increase in the application of excavators, some of the extensive faults often appear in construction operations, users who generally use the excavator for more than one or two years can understand some; for example, the excavator walks away, the user can immediately realize: walking The oil seal of the distribution (also known as the center rotary joint oil seal) is destroyed; the flow rates of the two hydraulic pumps are different; there is a problem with the travel motor. The hydraulic cylinder is quickly vented: immediately realize that the safety relief valve is not tightly closed, or the cylinder oil seal is seriously damaged, etc.