装载机断路故障表现为在保险丝或者自动保护开关完好的情况下，接通电路开关，用电设备不工作。该种故障原因是山东装载机电路中插头松动、脱落或有油污，开关触点氧化或失效，导线折断或搭铁线搭铁不实。
Shandong loader circuit failure in performance under the protection of a fuse or automatic switch intact, the electrical circuit switch, the electrical equipment is not working. The cause of the malfunction is kind Shandong loader circuit plug loose, fall off or have oil, switch contact oxidation or failure, wire break or grounding wire grounding is not true.

因此通常采用装载机试灯逐点检查，为了便于记忆，装载机检查方法归纳为：查断路，灯并联；一段接车体，一端连测点；接通总开关，逐点来查线；灯亮电路通，不亮电路断；灯亮后找，不亮向前查；亮与不亮间，即为断路点。
So usually Shandong loaders test lamp spot-checking, in order to facilitate memory, Shandong loader inspection methods are summarized as follows: check circuit, lights in parallel; some take the body, connected at one end-point; the main switch is turned on, point by point to check line ; lights circuit pass, off circuit breaker; looking after the lights, off the investigation forward; between the light and does not shine, is the breaking point.