When a lot of people buy a excavator and use a period of time, the equipment will have a large and small fault, the major fault can be repaired by professional maintenance personnel, and there will not be a few major failures in a year, but the small fault occurs frequently, although the maintenance will not spend too much money, but the equipment will be stopped. Delay the time of work and cause losses, so the small editor also aimed at these questions and found master Yang who was in charge of repairing the Sunward excavators, and asked him to tell us about the common problems of the Sunward excavators and the treatment methods.
Little editor: Hello, master Yang, you have been doing the excavator maintenance for a long time. The excavators that have been repaired under your hands are also countless. Can you tell us about the problems that the excavators often encounter and how to deal with it?
Master Yang: Well, the first is the slow working speed of the mountain and river intelligent excavators, the main reason for the slower working speed of the excavator is the decline of the engine power and the hydraulic system. The hydraulic pump of the excavator is a piston variable pump. After a certain time, the hydraulic components (cylinder, plunger, valve plate, nine hole plate) in the inner part of the pump are worked. It is unavoidable to produce excessive wear and tear, which will cause internal leakage and disharmony of the data, resulting in excessive flow of oil and slow working speed. At this time, the whole machine needs to be overhauled and repair and replace the worn parts.
But if not the long working time of the excavator suddenly slowed down, we need to check the following aspects. First check the circuit fuse circuit breakage or short circuit, check the pilot pressure is normal, and see whether the servo control valve - servo piston is dead and the distributor confluence failure and so on, and finally the hydraulic pump dismantling data measurement to confirm the excavation The machine problem lies.
Second is the mountain and river intelligent excavator walking deviation, the reason may be the walking distribution of oil seal (also known as the central rotary joint oil seal) damage; two hydraulic pump flow size is different, one side of the walking motor has problems. The hydraulic cylinder quick release may be the safety overflow valve closed, or the cylinder oil seal serious damage and so on.
Third is the engine speed decline, first of all to test the engine output power, if the engine output power is lower than the rated power, the cause of failure may be poor fuel quality, low fuel pressure, valve clearance is wrong, the engine cylinder is not working, fuel injection is wrong, fuel quantity adjustment value is wrong, intake If the engine's output power is normal, it is necessary to see if the flow of the hydraulic pump is not matched with the output power of the engine. The speed of the hydraulic excavator is inversely proportional to the load in the operation, and the product of the flow and pump output pressure is a no The output power of the pump is constant or approximately constant. If the pump control system fails, the engine, pump and valve can not be optimized in the different working conditions. The excavator will not work properly. This kind of fault should start with the electrical system first, then check the hydraulic system, and finally check the mechanical transmission system.
Xiaobian: what are the good suggestions for every excavator before construction?
Master Yang: daily inspection is an important link to ensure the high efficiency of the hydraulic excavator for a long time. Especially for the individual, the daily routine inspection can effectively reduce the maintenance cost.
First, check the appearance of the machine around two circles and whether the mechanical chassis is different, and whether the rotating support has oil outflow, and then check the deceleration brake device and the bolt fastener of the crawler. This tightening is tightened and the change is changed in time. If it is the wheel excavator, it is necessary to check whether the tire is different, and the stability of the air pressure.
It is understood that the wear of the bucket teeth will greatly increase the resistance in the construction process, which will seriously affect the working efficiency and increase the wear and tear of the equipment parts.
Check whether there is any crack or oil leakage in the bucket and cylinder. Check the battery electrolyte and avoid being below the low level.
Air filter is an important component to prevent a large number of dusty air from entering the excavator. It should be checked and cleaned regularly.
Check oil, lubricating oil, hydraulic fluid, coolant and so on frequently. Do you need to add it? And choose the oil according to the instructions, and keep it clean.
Xiaobian: for some users, they found that during the construction process, they discovered the problem of abnormal fuel consumption of excavators. What is this?
Master Yang: first of all, consider the use of high quality diesel fuel; if the quality of diesel oil is poor, it will cause serious combustion in the cylinder, causing the wear of the piston ring and cylinder, and after the gap is too large, the oil is burned in the combustion chamber, causing the oil consumption.
2, whether the timely maintenance, whether the use of genuine diesel filter cartridge;
3, the oil is added.
Second consideration
1. The seal of the engine itself is not strict. As the engine is used for a long time, the wear of the piston to the cylinder wall is gradually increased, the gap between the piston is increased, the oil will enter the cylinder through these gaps; when the engine is used for a long time, the seal gasket of the valve clearance will also aging, the seal is not strict, and the oil will enter the cylinder through the valve. Burn;
2. Observe whether there is blue smoke in the excavator.
3, the engine oil and the lower exhaust has the phenomenon of drop oil, may be the piston ring wear or cracking cause the oil. If the lower exhaust oil is not serious, the turbocharging seal is not strict, the turbocharging two pipes are removed to see if there is any oil, if there is oil, it is a turbocharger fault;
4. Check whether the oil consumption is caused by the damage of valve oil seal.
Xiao Bian: Well, thank you very much for the patience of master Yang. I am really worthy of the maintenance of the old hand. I don't know if you have heard these answers. If you have dispelled the doubts in my heart, welcome to explain the knowledge about the maintenance of the excavator next time.
Master Yang: Thank you. I hope you can take good care of your excavator in the future production process, so that it can last longer.
