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Home>>news>>Common Faults of Used Excavator

Common Faults of Used Excavator

Tags: used digger for sale hot sale used excavator2014-01-10

Used excavator experiences a rapid development. Here, we would like to recommend some basic faults.

1. the reasons of trip stop
1) Variable-speed drive gear wear W4-60 type excavator adopts the transmission mechanism of mechanical-shift speed. This kind of transmission mechanism realizes the shift by relying on sliding tooth set making the axial movement on the fixed gear sets and engaging each block of driven gears. In the process of frequent shift, the tooth faces of the meshing gears are easy to be grounded into a cone, causing to reduce the meshing performance and trip stop.
2) The reduction of self-locking mechanism's performance is to prevent the transmission from trip stop. This kind of used excavator places the steel balls and springs with the function of self-locking in the Ⅱ、Ⅲ block of transmission, Ⅳ、Ⅴ block inside cover hole and Ⅰ、R block in the fork. When the elasticity of spring with the function of self-locking is reduced or broken off, self-locking performance of self-locking mechanism will be decreased until disappeared, giving rise to the trip stop of transmission. At the mean time, if the grooves of locking balls or selector rods are abraded, it will cause the trip stop of transmission.
3) The misalignment of gearshift: The transmission of the used excavator uses the way of mechanical human-shift. If gear shift lever、vertical axis、horizontal axis、vertical screw become less crowded, it will give rise to the trip stop of transmission.
4) Due to the work category of used excavator and design of used excavator, the abrupt changes of the external load will cause the trip stop of transmission. When the external load suddenly changes because of the bumpy roads、machine for downhill or improper driving route, this sudden change of load makes the gear meshing gear trip out, due to the production of axial thrust, through the effect of wheels and shafts on the meshing gears of transmission,causing the trip stop of transmission.
5) The improper operation method: When the used excavator drives on the ramp( especially the minus grade), it will also cause the trip stop of transmission on account of the improper operation method.

2. precautionary measures
1) In accordance with the procedures and driving main points strictly and avoid dozen tooth when shifting gears in order to reduce the wear of gear pair.
2) Strictly follow the system maintenance and strengthen the upkeep of transmission device. When the trussing of the shifting device is connected improperly, we should adjust it without delay to ensure the excellent performance of the shifting device.
3) Pay more attention to the maintenance of self-locking mechanism and protection and timely repair or replace the locking balls、springs and selector rods whose positioning actions are reduced or disappeared to keep the self-locking performance of self-locking mechanism in good state.

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