2. performance. In terms of performance, Liugong is higher than Sanyi, especially the hydraulic system is not very harmonious. Another common problem is that the display screen is easy to break down within 2000 hours, and the engine will be boring after 3000 hours, especially when the water temperature comes up. Liugong's crane is very good, belonging to the old product, stable and mature, with high cost performance.
3. Price. After all, Liugong has been working for a long time, with good quality and high cost performance. The price of Sany is cheaper than that of Liugong.
4. Fuel consumption. Sany's fuel consumption is higher than Liugong's, and Liugong saves 7 to 9 fuel per hour than Sany's 485.6000. Liugong is the most advanced IPC intelligent management system in China, and the engine protection system is not available in other models. The water temperature and oil temperature can automatically adjust the fan, which is easy to use and consumes less oil.
5. After-sales service. Liugong's after-sales service is better than Sany.
Extended data:
Common faults
1, the reason of "trip stop"
(1) The transmission mechanism with variable speed on the excavator is worn. This transmission mechanism relies on the sliding gear sleeve to move axially on the fixed gear sleeve and mesh with the driven gears of all gears to realize gear shifting. In the process of frequent gear shifting, the tooth end faces of the meshing gears are easily ground into conical surfaces, which reduces their meshing performance and leads to "tripping and stopping".
(2) Performance degradation of the self-locking mechanism In order to prevent the transmission from "tripping and stopping", the self-locking performance of the self-locking mechanism will be degraded until it disappears when the elastic force of the spring which plays the role of positioning and self-locking is weakened or broken, resulting in "tripping and stopping" of the transmission. At the same time, if the positioning steel ball or the groove on the shift fork shaft is worn, it will also cause the transmission to "jump".
(3) Improper adjustment of gear shifting device. The transmission of this excavator adopts mechanical hand to shift gears manually. If the shift lever, vertical shaft, horizontal shaft and vertical fixing screw are loose, the transmission will also trip.
(4) Sudden change of external load Due to the working nature of the excavator and the design of the excavator itself, the sudden change of external load will also lead to the "trip stop" of its transmission. When the road surface is rugged, the machine is driving downhill or the driving route is not correct, the external load suddenly changes, which causes the gearbox to trip and stop.
(5) Improper operation method When the excavator is driving on a slope (especially downhill), if it is improperly operated, it will also cause the transmission to "trip and stop".
2. Preventive measures
(1) Operate in strict accordance with the operating rules and driving essentials, and try to avoid "tooth-beating" when shifting gears to reduce the wear of gear pairs.
(2) Strictly implement the maintenance system and strengthen the maintenance of the gear shifting device. When the gear shifting device is not connected properly, it should be adjusted in time to ensure the good performance of the gear shifting device.
(3) Pay attention to the repair and maintenance of the self-locking mechanism, and timely repair or replace the positioning steel ball, spring and shifting fork shaft that reduce the positioning effect or lose the positioning efficiency, so that the self-locking performance of the self-locking mechanism is in a good state.
(4) When assembling the transmission, it should be operated in strict accordance with the operating procedures to ensure that all parts of the transmission are adjusted correctly and appropriately. On a steep downhill road, the driver should operate in strict accordance with the essentials of downhill movement and must not violate the rules.
3, emergency disposal methods
When the excavator is driving, if the transmission trips and stops, it should stop (or continue driving) in time, and then find out the reason and eliminate the fault. The specific method is:
(1) If "trip and stop" occurs when driving on a flat road, you can stop according to the normal stop principle, carefully find out the cause and eliminate the fault.
(2) When "tripping and stopping" occurs when driving uphill, the gear can be in low gear or I gear, and then stop when driving to the top of the slope to troubleshoot; If the downshift is unsuccessful or "trip stop" occurs again, stop according to the action essentials and requirements of ramp parking, and then troubleshoot.
(3) In case of "tripping and stopping" when driving downhill, the gear should be positioned at a high speed position according to the essentials of shifting, or the measures of "grabbing the gear" (emergency downshifting) should be taken. After driving to the bottom of the slope, the machine should be stopped for inspection and troubleshooting.
References:
Baidu encyclopedia-excavator