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2=SimHei clutch friction plate wear; internal leakage of oil passage.
After investigation, the hydraulic oil in the fuel tank has not deteriorated; the oil level is above the mark and there is no shortage of oil; during the pressure test, the working pressure of the hydraulic pump is normal, the pressure limiting valve works in accordance with the standard; the dismantling transmission knows that all the clutch plates are also free. Finally, a pressure test was carried out on the oil passage in the intermediate shaft, and it was found that the intermediate shaft leads to the oil passage of each clutch and the oil passage is chaotic.
The central shaft structure of the original transmission of the bulldozer is milled with three grooves of about 18, which are bonded with adhesive glue in the inner hole of the central shaft. The grooves are respectively used as the first gear clutch 1. The central shaft 2. The shaft core The oil supply pipe of the clutch is responsible for the supply of oil to the clutch. The oil passes through the copper pipe. 1. The central shaft 2. The oil passage area is larger than the original surface. 3. The oil passage 4.1 is blocked. In addition, the shaft core wears, causing the shaft core to sway in the central shaft hole, causing the oil passage cavity to be inoperable.
At that time, it was very difficult to repair the transmission. Because there were no accessories in China, it took more than 10,000 yuan to purchase the transmission assembly. In order to solve the urgent need of production, it is decided to improve the central shaft of the design transmission, and use separate oil passages to supply oil for each clutch separately. The improved central shaft structure 2, that is, the worn shaft core is extracted from the inner hole of the central shaft, Three copper tubes of ¢16mm are embedded in the central shaft and brazed and welded. As a slight increase, the required oil supply of each clutch meets the original technical requirements.
The improved central shaft has a good effect on the assembly test, which completely solves the problem of oil leakage and leakage of the intermediate shaft. The use is still in good condition, which proves that the improvement is reasonable and feasible.
Through the improvement of the 330 bulldozer transmission, we believe that the central axis design of the transmission is unreasonable and it is necessary to improve.
Therefore, the operation and maintenance personnel of construction machinery must be reminded not to ignore the role of the anti-loose gasket when repairing and maintaining the machine. If it is really impossible to use the anti-loose gasket and there is no spare part, then it is necessary to choose the appropriate material to make it and install it securely. It must not be saved and leaked to prevent such accidents.