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挖掘机上的压力传感器是挖掘机系统的核心部件，用于液压控制，在挖掘机不断的启停，挖掘过程中，压力传感器会承受很大的压力，所以说传感器的耐压，以及重复性很重要；

一台好的挖掘机可以连续升降几十万次，国产很多挖掘机大厂，像徐工、三一重工都用日本长野计器的压力传感器，包括世界上的挖掘机，神钢，卡特彼勒都是用长野NKS的。

其实国产的压力传感器挺不错的，中国的炼钢技术太落后，根本生产不出高强度，高可靠性的材料，所以对于挖掘机这种重型机械来说，一辆少几十万，都是用进口的传感器。

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5617481382 Bracket3、挖掘机起动时，曲轴不能转动的机械故障诊断与修复发动机起动时，在起动系统完好的情况下，按起动开关，起动机有响声而曲轴不能转动，则属于机械故障。引起发动机曲轴不能转动的原因如下所述。
① 起动机与飞轮齿啮合不良。齿圈与起动机齿轮在起动发动机时会发生撞击，造成牙齿损坏或牙齿单面磨损。若牙齿连续三个以上损坏或磨损严重，起动机齿轮与齿圈牙齿便难以啮合。
② 粘缸。发动机温度过高时停车熄火，热量难以散出，高温下的活塞环与气缸粘连，冷却后无法起动。
③ 曲轴抱死。由于润滑系故障或缺机油造成滑动轴承干摩擦，以致终抱死曲轴而无法起动。
④ 喷油泵柱塞卡死。

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154-71-22471一、更换液压油时准备工作
　　1、一台挖掘机更换液压油时，应做如下准备：购买整车液压系统用的油。(液压油箱容积的2.5倍)，滤芯，洗油，3公斤面粉，绳子，封闭液压油管的油堵，(按换油的挖掘机上的油管配制)一台汽泵和大小空油桶等。准备一台正常的挖掘机。将换油的挖掘机动臂抬升到高点，斗杆及铲斗收到内点后发动机熄灭(动臂缸，斗杆缸和铲斗缸的缸杆全部伸出到顶点)。

　　2、液压油箱的清洗：将箱内的液压油全部放出，撤出液压滤芯，把泵和油箱之间的管路从泵的接口处拆开，放出管路内的油液。用洗油冲洗液压油箱和管路。用医用沙布把液压油箱内部擦净。将面粉揉和到能拉伸面的程度分成三份，用面团分三次粘干净液压油箱的里面尤其是油箱的边角处和滤芯筒。液压油箱和滤芯筒内清理干净。更换新的液压滤芯，上好盖板。

　　3、液压柱塞泵的冲洗：挖掘机上每种液压柱塞泵都有冲洗油口，(放油口)。拧开上下放油口，放出泵壳内的液压油，拧上泵下面的油堵，从泵上面的油口向泵壳内注满洗油，再拧开泵下面的油堵，放出泵壳内的洗油，反复冲洗几次后，后用汽泵把泵壳内的余油吹干净后，注满洁净的液压油，拧紧油堵即可。

　　4、更换泵进油口密封圈，(O形圈)，将液压油箱连接到泵的供油管路连接好，从液压滤芯油口(放好更换后的滤芯)向液压油箱内注满洁净的液压油。

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