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1台使用了8 000 h的小松PC200-7型挖掘机,工作中出现整机速度较慢,且工作1 h后还常出现发动机失速(俗称“憋车”)现象。初步推断故障原因可能是:主溢流阀出现故障;PPC阀(比例压力控制阀)压力较低;LS阀(主泵压力感知阀)或PC阀(主泵压力和排量调节阀)调整不当或失效;主泵伺服阀活塞节流孔堵塞或卡滞;液压泵内部缸体、柱塞磨损较重,内泄量较大。
One 8,000 h Komatsu PC200-7 excavator was used. During the work, the whole machine appeared to be slow and the engine stall (commonly known as “snapping car”) often occurred after 1 hour of operation. The primary reason for the failure may be due to a failure of the main pressure relief valve, low pressure in the PPC valve (proportional pressure control valve), improper adjustment of the LS valve (main pump pressure sensing valve) or PC valve (main pump pressure and displacement control valve) Or failure; the main pump servo valve piston choke plug or jam; hydraulic pump internal cylinder, heavy plunger wear, large amount of internal leakage.