What is the directional control loop of the load? This refers to the need to use this control loop when the system needs frequent continuous action and requires many accessories for the commutation process. This article Lisong shares the analysis and maintenance of the main 220 excavator broken hammer. method.
A Komatsu PC130-8M0 excavator, with an excavator operation of 5,900 hours, is currently under construction. Recently, there has been a failure of the breaker's weakness in the operation, and the bubble head of the excavator has been out of the hammer for several hours. It is not hydraulic oil, and the gas pressure of the excavator head is also less.
Cause Analysis
1. Except that the butter on the excavator gun hammer is hydraulic oil, check that the outflowing liquid is not hydraulic oil, so check whether it is butter?
2. Regarding the leakage of the excavator, first confirm that the nitrogen valve is leaking, the method is very simple, apply some saliva around the nitrogen valve, if the nitrogen valve is not leaking, then the gas seal is broken
3. If the oil flows out along the drill rod, then it is necessary to confirm whether the butter hits too much and flows down after high temperature. If it is not, it must be hydraulic oil. If it is hydraulic oil, the oil seal must be broken. Open the movement to check the oil seal, piston and cylinder. Under normal circumstances, there will be strain on the piston and cylinder. If it is not serious, it can be used after grinding with oil stone. If it is more serious, you can only replace the piston. This type of excavator hammer is weak and there is liquid outflow, the oil seal must be replaced.
Related reading: Komatsu PC130-8M0 excavator main pump oil leakage
A Komatsu PC130-8M0 excavator, which has not been damaged before, has been doing earthwork tree planting beside the road, changed the oil pipe, and recently changed the oil seal of the main pump skeleton of the excavator many times, and the oil leaked again after a short time. phenomenon.
Analysis: Replacing the skeleton oil seal of the excavator multiple times is invalid and the new oil seal will be damaged every time, eliminating the possibility of human replacement errors. It is possible that the bearing is damaged, and the skeleton oil seal is damaged due to the jump when the shaft rotates.
Inspection process: the hydraulic seal of the skeleton oil seal of the front drive shaft seal cover of the main pump is removed, and the skeleton oil seal is found to be damaged when the main pump seal cover is removed. After the replacement, the excavator leaks oil again within a short period of time. Multiple replacements are invalid and the skeleton oil seal is damaged every time. , Decompose the main pump and find that the roller bearing on the front drive shaft is damaged.
