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我部新买了一台ZL45A型装载机，在一次施工中转向系统突然出现了以下现象：发动机刚起动、机油油温比较低的时候，转向一切正常；当机油油温达到80℃以上时，转向失灵；发动机熄火以后，转向盘可整圈转动（正常自由行程为左右旋转8°），但转向轮却没有丝毫偏转。针对这种现象
I bought a new ZL45A loader, in a construction steering system suddenly appeared the following phenomena: the engine just started, when the oil temperature is relatively low, turn to all normal; when the oil temperature reached 80 ℃ or more, Steering failure; After the engine stalls, the steering wheel can rotate the entire circle (normal free-wheel rotation for the left and right 8 °), but the steering wheel is not the slightest deflection. For this phenomenon