裝載機斷路故障表現為在保險絲或者自動保護開關完好的情況下，接通電路開關，用電設備不工作。該種故障原因是山東裝載機電路中插頭松動、脫落或有油污，開關觸點氧化或失效，導線折斷或搭鐵線搭鐵不實。
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.

因此通常采用裝載機試燈逐點檢查，為了便于記憶，裝載機檢查方法歸納為：查斷路，燈并聯；一段接車體，一端連測點；接通總開關，逐點來查線；燈亮電路通，不亮電路斷；燈亮后找，不亮向前查；亮與不亮間，即為斷路點。
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.