(1) Wear of the mechanical shift transmission mechanism. The W4-60 excavator uses this transmission mechanism, which relies on the axial movement of the sliding gear sleeve on the fixed gear sleeve to engage with the various driven gears to achieve gear shifting. During frequent operations, the tooth ends of these engaged gears may be ground into a cone shape, thereby reducing their engagement performance, leading to "gear skipping".
(2) Decline in the performance of the self-locking mechanism. This excavator is equipped with steel balls and springs with self-locking functions in the box cover holes above the shift fork shafts of the second and third gears, as well as in the shift fork of the first and reverse gears. If these springs lose their elasticity or break, the performance of the self-locking mechanism will be affected, potentially causing the transmission to "skip gears". At the same time, wear of the positioning steel balls or the grooves on the shift fork shafts may also cause this problem.
(3) Improper adjustment of the shift mechanism. This excavator's transmission uses a mechanical manual shift method. If the shift lever, longitudinal shaft, transverse shaft, and vertical fixing screws are loose, it may also cause the transmission to "skip gears".
(4) Sudden changes in external loads. Due to the working characteristics and design of the excavator, when the road is uneven, the machine is driving downhill, or the driving route is improper, resulting in sudden changes in external loads, these changes will act on the gear engagement gears of the transmission through the wheels and transmission shafts, causing axial thrust and disengagement, thereby resulting in "gear skipping".
(5) Improper operation methods. When driving the excavator on a slope, especially downhill, if the operation is improper, it may also cause the transmission to "skip gears".Crawler Excavator
