[Exemple 1] a ZL-50C fork-lift truck (engine is 6135K-9a model) when construction, the driver feels the machine lades gradually faint, observation appearance, discover water Wen Gao, engine oil does not have pressure, stop machine examination immediately then. Detect discovery, driving gear of lubricating oil pump ruptures, connecting rod made of baked clay burn is serious. Because be in construction site, did not do further detailed examination to change assembly of lubricating oil pump and crankshaft connecting rod are made of baked clay, go to hastily next answer, in fork-lift truck as a result the travel in returning way is less than 10KM, the driving gear of lubricating oil pump that changes newly ruptured again. Repair personnel and it is strange to drive to feel very, stop then machine the engine oil that discharges the carapace end engine oil undertakes checking, discover engine oil is too dirty, contain scrap and plain bearing liner to decrease adjust golden bits, the mesh that is the same as colander of collect of opportunity be soiled has a small hole. The analysis thinks, causing the cause that driving gear of lubricating oil pump ruptures is, after the mesh of colander of engine oil collect cut a small hole, the metallic bits in bringing about engine oil enters lubricating oil pump ceaselessly, squeeze the driving gear of lubricating oil pump thereby crack. Ever since, cleaned oil duct, changed mesh, engine oil and lubricating oil pump; When the exercise after outfit answer, do not have the phenomenon that occurrence lubricating oil pump damages again.

[Exemple 2] one 6135 model diesel engine, happened to burn the made of baked clay accident that hold an axis in the arms. Tear open check discovery, the axis carries drive shaft of lubricating oil pump (axis and department of union of driving gear end panel) rupture, cause lubricating oil pump not pump is oily, bring about burn the made of baked clay accident that hold an axis in the arms. The analysis thinks, the reason that ruptures in place of driving gear end panel is, the clearance of driving gear and the inert gear that its cooperate is adjusted undeserved. Original, personnel is repaired when repairing and did not realize the main effect of this clearance, because of when this is assembled, also undertaking checking to its. Because affect the link of this clearance more, accumulate an error bigger, use on the design so add between body of lubricating oil pump and airframe underside, decrease the method that adjusts spacer to solve. Clearance of correct clench the teeth should be between 0.12-0.35mm, if repair the inspection that this gap does not make when assembling, can create gap of this clench the teeth undeserved or some position are basic without clearance, make transmission shaft of lubricating oil pump gets very big curve load, bring about transmission shaft inside occurrence stress of position of union of driving gear end panel centers a phenomenon, as time passes is caused namely rupture

Two afore-mentioned breakdown, solid the human error accident that belongs to use maintenance technician to cause, it is technical issue, it is administrative issue more, wanting to improve beneficial result below so irreverent course of study and low use maintenance level is not actual.
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