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故障现象 一台加藤NK400E—Ⅲ型汽车起重机,在使用时起重臂变幅缸和伸缩缸的动作均无力,速度缓慢;测得为其供油的2~＃泵(见图1)压力仅为8.5 MPa(标准值为IOMPa)。1~#泵为起升机构供油,由于起升机构无故障,表明1~#泵并无故障;又由于1~#泵与2~#泵的排量及公称压力都相同,故将两泵的压力油口互换,用2~＃泵为起升机构供油时,测得其起
Symptoms A Kato NK400E-Ⅲ truck crane, arm jib boom and telescopic cylinder movements are weak, slow speed; measured 2 ~ # pump for its oil pressure (see Figure 1) only 8.5 MPa (standard value IOMPa). 1 ~ # pump for the lifting mechanism for oil, because the lifting mechanism is faultless, indicating that 1 ~ # pump without failure; and 1 ~ # pump and 2 ~ # pump displacement and nominal pressure are the same, so the two Pump pressure port interchangeable, with 2 ~ # pump for the lifting mechanism oil, the measured from the beginning