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1台使用了14000h的利勃海尔R944C型挖掘机在工地施工时,启动后出现柴油机低怠速转速不稳定故障,同时伴随“嗡、嗡”异响,而高怠速和工作速度状态下柴油机运转正常。本文结合该型挖掘机柴油机供油系统工作原理,查找故障并分析其原因。1.供油系统工作原理利勃海尔R944C型挖掘机配装了单体泵、高压管、喷油器组成的供油系统(简称PLD供油系统)。柴油机凸轮轴带动进、排气门运动的同时,带动单体泵挺柱动作。凸轮转动时,顶动单
A 14,000h Liebherr R944C excavator was used at the construction site to start the diesel engine at low idle speed instability, accompanied by “Om, Om” abnormal sound, and high idle and operating speed state diesel engine operating normally. This article combined with the working principle of the diesel engine oil supply system of the excavator to find the fault and analyze the reason. 1. The working principle of the oil supply system Liebherr R944C excavator equipped with a single pump, high pressure pipe, fuel injector system (referred to as PLD oil supply system). Diesel camshaft led into the exhaust valve movement at the same time, driven single pump tappet action. When the cam rotates, the top moves single