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ＳＳ_４型机车升不起弓的原因判断及处理郑州北机务段宋泉生ｌ原因受电弓按键开关４０２ＺＡ（４０３ＺＡ）接触不良。ｂ，受电弓故障开关５７８ＧＫ接触不良或在故障位。门联锁重联压力继电器５４５ＹＪ本“身故障、整定值调整过高或其联锁接点不良。ｄ．受电弓升弓电空?..
SS_4-type locomotive can not afford to raise the bow to determine the reason and treatment of Zhengzhou North Locomotive Song Quansheng l reason pantograph key switch 402ZA (403ZA) poor contact. b, pantograph fault switch 578GK bad contact or fault bit. Re-linkage of the door interlock pressure relay 545YJ the "body failure, set value adjustment is too high or its interlocking contacts bad. D.