(1) Variable speed transmission mechanism wear W4-60 excavator is a mechanical gear shift transmission mechanism, this transmission mechanism depends on the sliding gear sleeve on the fixed gear sleeve and engage with the driven gear of each gear to achieve gear shift. In the process of frequent shift, the gear end surface of the above meshing gear is easy to be ground into a conical shape, resulting in reducing its engagement performance and leading to "jump gear".
(2) The performance of the self-locking mechanism is reduced to prevent the transmission "jumping", this type of excavator has the steel ball and spring in the shaft of the transmission and the self-blocking and fork. When the elasticity of the spring of the positioning self-locking function is weakened or broken, the self-locking performance of the self-locking mechanism will decline until disappear, resulting in the transmission "jump block". At the same time, the steel ball or fork shaft on the groove if wear, can also cause the transmission "jump".
(3) Improper adjustment of the shift device The transmission of this type of excavator adopts the mechanical mode of human shift. If the transmission lever, vertical shaft, horizontal shaft and vertical fixed screw are loose, the transmission "jump".
(4) Sudden change of the external load Due to the working nature of the excavator and the design reasons of the machine itself, the sudden change of the external load will also lead to its transmission "jump block". When the road surface is uneven, the machine makes downhill driving or the driving route of the external load suddenly changes, the sudden change of the load will act on the wheel and transmission shaft of the transmission gear engagement gear because of the axial thrust and off, resulting in the transmission "jump".
(5) Improper operation method When the excavator drives on the ramp (especially downhill driving), if the operation is improper, it will also lead to the transmission "jump gear".
2. Preventive measures
(1) operate in strict accordance with the operating procedures and driving essentials, and try to avoid shifting "gear" to reduce the wear of the gear pair.
(2) Strictly implement the maintenance system and strengthen the maintenance of the gear shift device. When the rod system of the shift device is not connected, it should be adjusted in time to ensure that the shift device has good performance.
(3) Pay attention to the repair and maintenance of the self-locking mechanism, the positioning steel ball, spring and fork shaft of the positioning effect reduces or loses the positioning efficiency, should be repaired or replaced in time, so that the self-locking performance of the self-locking mechanism is in a good state.
(4) When assembling the transmission, the operation should be strictly in accordance with the operating procedures to ensure that all parts of the transmission are adjusted correctly and tightened properly. When the larger downhill surface, the driver should operate strictly in accordance with the essentials of the downhill, and must not violate the rules.
Jining Qianyu Commercial & Trade Co., Ltd. is located in Jining, Shandong, the hometown of engineering machinery manufacturing. We specialize in R&D and production of bulldozers and excavators. The company has more than 20 years of experience in selling bulldozers, excavators and other construction machinery spare parts. The company mainly cooperates with brands such as Komatsu, Shantui, Caterpillar, Hitachi, and Sany.
The company's business scope covers the R&D,production, sales, leasing, maintenance and other import and export businesses of construction machinery and parts. The company adheres to the concept of "Be honest and act professionally". We work together, develop pragmatically, and strive to provide more and better high-quality products and services to domestic and foreign customers to repay the care and support of new and old customers at home and abroad.
The company adheres to the concept of "Be honest and act professionally".
We specialize in R&D and production of bulldozers and excavators.
Specializing in the sales of engineering machinery parts for many years.
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The company adheres to the concept of "Be honest and act professionally". 
