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一台小松PC360-7型挖掘机的发动机大修后试机,发现工作无力,发动机空载高怠速为2 170 r/min,一旦带负荷或做溢流时,转速立即下降到1 650 r/min,转速差达520 r/min,主液压泵油压从33 MPa下降到28 MPa,挖掘机无法正常工作。在发动机转速下降时,检查排气管排烟正常。由于该挖掘机发动机大修前液压系统工作正常,所以排查的重点放在发动机上。
A Komatsu PC360-7 excavator engine overhaul test machine and found work weakness, the engine idling idle at 2 170 r / min, once the load or overflow, the speed immediately dropped to 1 650 r / min , Speed difference of 520 r / min, the main hydraulic pump hydraulic pressure dropped from 33 MPa to 28 MPa, the excavator can not work properly. When the engine speed drops, check the exhaust pipe smoke is normal. Due to the excavator engine overhaul before the hydraulic system is working properly, so the investigation focus on the engine.