PC200 excavator bucket hydraulic cylinder site emergency repair

Using the engine and the frame to cause a fault caused by poor grounding. The engine of Xinjiang Malan 63656, Wang Yanqing, Li Xuechuntai 21308 loader, after repairing and reinstalling the frame, found that when the engine was started, the two low-pressure tubing roots were connected. The oil inlet pipe of the fuel tank is the oil pipe from the diesel filter to the pressure oil pump. The outside of the two oil pipes are sparking in the part where the steel wire mesh is touched; 2 the ground wire connected to the generator and the regulator is heated and smokes. The adjuster bracket is fixed to the frame.

At the beginning we thought that there was a route to the ground, so the whole car line was inspected, but no grounding was found. Restart the engine and the fault persists.

Through the analysis of the fault phenomenon at several startups, it is judged that the fault may be caused by the failure of the engine and the frame to cause the fault to disappear.

The main cause of this failure was that the rust and oil on the mounting bracket were not carefully cleaned when the engine was installed, resulting in poor contact between the engine and the frame and poor electrical conductivity.

The engine is not in good contact with the frame, so that the fuel tank inlet pipe connected to the frame and the grounding wire connected to the regulator and the regulator become the connecting line between the engine and the frame to form a circuit of the whole circuit.

Due to the small effective cross-sectional area of ​​the tubing wire mesh and the grounding, the current is large at startup, which causes the above-mentioned faults to occur.

Therefore, after the engine is repaired, the maintenance personnel must pay attention to cleaning the engine and the mounting bracket on the frame when installing the engine, clear the oil and corrosion on the bracket, ensure good contact between the engine and the frame, and prevent the occurrence of bad ground faults.

Communication address Xinjiang Malan 63656 troops 841700 to 00 excavator bucket hydraulic cylinder site emergency repair Henan Province Zhumadian City Road Section Engineering Department Fan Chengdai Yan Qindai forest I Taiwan Taiwan Komatsu, 200 excavator in construction, driver careless The piston rod of the bucket hydraulic cylinder hits the exposed live wire, causing the piston rod to have an electric shock of 22 inches, 41 feet and a depth of 0.21. The hand feels uneven. Due to the construction in the field, the engineering task was heavy. At that time, only the fine sand bars of the piston rod were simply polished. After two days of use, the hydraulic cylinder has oil leakage. At this time, not only the piston rod needs to be repaired, but also the oil seal is replaced. Therefore, we have taken the following treatments: (1) Applying the repairing agent to the piston rod electric shock coating surface coated with JC2205 titanium alloy The combination of grinding and repairing agent, the repairing agent is applied to the wounded surface according to the human 3=62 repairing agent to make it fully adhered, so that the repairing agent is slightly higher than the wounded surface.

(3) Replacing the oil seal Because the lock nut of the bucket hydraulic cylinder is tightly tightened, and the dust seal seal wear ring of the hydraulic cylinder head is made of plastic nylon composite material, it is difficult to remove the lock without special tools. The nut, if used with a local grill heating method, will damage the plastic nylon material. To this end, the use of waste oil heating method to remove the lock nut. The specific method is to first find a large container, which is equipped with waste engine oil. Do not heat it on the fire. Put the cylinder head in 100, 150 hot oil to heat it, you can easily remove the nut.

After the hydraulic cylinder is repaired, it has been used for many years, and the sealing effect is good, which proves that the repair method is feasible, which not only saves expenses, but also shortens the repair time and improves the mechanical efficiency.

Address: Engineering Office, Highway Section, Zhumadian City, Henan Province, China 710079