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1.故障现象1台工作了760h的15t级挖掘机斗杆动作异常,表现在以下4个方面:一是单独操纵斗杆缸伸出和缩回时动作缓慢;二是斗杆缸缩回和铲斗缸缩回复合动作,当铲斗转过其重心位置时斗杆缸自动停止动作;三是右行走马达与斗杆缸同时动作时,斗杆缸动作正常,但挖掘机无法正常行走;四是出现以上故障时前主泵压力正常,后主泵压力很低。分别单独操纵动
1. Symptom 1 work 760h 15t excavator arm abnormalities, manifested in the following four aspects: First, the separate operation of the stick cylinder out of action and retract slowly; second is the arm cylinder retraction and Bucket cylinder retract compound action, when the bucket turned its center of gravity when the arm cylinder automatically stop action; third is the right to move the motor and bucket cylinder at the same time action, arm cylinder action is normal, but the excavator can not walk normally; Fourth, the above failure occurs when the main pump pressure is normal, after the main pump pressure is low. Operate individually