The installation and disassembly method of the excavator bearing should be determined according to the structure, size and matching nature of the excavator bearing parts. The pressure of installation and disassembly should be directly added to the end face of the tightly fitted excavator bearing ring, and the pressure can not be transferred through the rolling body of the excavator bearing, because it will cause indentation on the working surface of the excavator bearing, affect the normal work of the excavator bearing, and even damage the excavator bearing. The cage, sealing ring, dust cover and other parts of the excavator bearing are easy to deform. The pressure of installing or disassembling the excavator bearing can not be added to these parts. Excavator bearing installation: (1) the shift device is not adjusted properly. If the transmission of this type of excavator adopts the way of mechanical manual shift, the transmission lever, longitudinal shaft, horizontal shaft, and vertical fixing screw loosening can also cause the transmission “jump gear”. Variable speed transmission mechanism wear (2) sudden change of external load Due to the working nature of the excavator and the design of the machine itself, sudden change of external load will also lead to the transmission “jump gear”. When the road surface is uneven and the excavator is driving downhill or the driving route is improper, the external load suddenly changes. The sudden change of the load will act on the gear meshing gear of the gearbox through the wheel and the transmission shaft, so that the gear meshing is disconnected due to the axial thrust generated, resulting in the transmission “jump gear”. (3) The transmission mechanism of the gear shifting device of the excavator relies on the sliding gear sleeve to move axially on the fixed gear sleeve and meshing with the driven gears of each gear to realize the gear shifting. In the process of frequency shift, the end faces of the teeth of the above meshing gears are easily ground into a cone, which results in the decrease of their meshing performance and leads to “jump gear”. (4) to prevent “jump out” of the transmission, excavator in transmission Ⅱ, Ⅲ cover and Ⅳ Ⅴ fork shaft at the top of the box cover hole and Ⅰ, reverse gear fork are self-locking Ann has the function of steel ball and spring. When the spring that plays the role of positioning self-locking is weakened or broken, the self-locking performance of the self-locking mechanism will decline until it disappears, causing the transmission “jump gear”. At the same time, if the positioning ball or fork shaft groove wear, can also cause the transmission “jump gear”. (5) improper operation method Excavator driving on the ramp (especially downhill driving), if the operation is improper, will also lead to the transmission “jump gear”.
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