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1.故障现象一批使用时间均超过3500h、整机工作效率均略有下降的某型25t挖掘机,在我公司进行批量再制造。在再制造过程中,这批挖掘机柴油机均出现挂上低速挡(1、2挡)“憋车”熄火、挂上高速挡掉速但不熄火故障。正常情况下,挂上高速挡掉速约为200r/min,而故障挖掘机挂上高速挡掉速达300 r/min以上。2.故障排查通常无论高速挡或者低速挡“憋车”熄火,柴油机排气管总会有大量黑烟冒出。维修人员在现场发现低速挡(1、2挡)“憋车”熄火时,柴油机排气管
1. Fault phenomenon A number of use of time are more than 3500h, a slight decline in the overall work efficiency of a 25t excavator, bulk remanufacturing in our company. In the remanufacturing process, these excavators diesel engines are hanging low gear (1, 2 block) “Catch the car ” flameout, hanging up the high gear out of the speed but not flameout failure. Under normal circumstances, hang up the high-speed gear off about 200r / min, and failure of excavators hanging high-speed gear out of speed of more than 300 r / min. 2. Troubleshooting Usually no matter whether the high-speed gear or low-speed gear Maintenance personnel found in the scene of low gear (1,2 block) “Catch the car ” flameout, diesel exhaust pipe