裝載機發生柴油機功率下降的現象經常發生，主要原因可能是柴油機制造質量沒有達到設計標準，導致裝載機柴油機功率減弱。那么導致山東裝載機柴油機功率下降的原因主要有哪些呢？
1、裝載機中連桿軸頸回轉半徑或活塞銷至頂部尺寸不合適，裝載機柴油機功率變弱，導致運行時活塞撞擊缸蓋，沖擊力直接作用于連桿小頭，使其工作不正常面斷裂。
Loader turning radius rod journal or piston pin to the top of the wrong size, loader diesel power becomes weak, leading to run the piston head impact, the impact force acting on the connecting rod head directly to the fracture surface is not working properly .
2、鑄造時的缺欠降低了缸體的剛度，發動機經過大的熱負荷后產生產生永久變形。
Casting defect reduces the rigidity of the cylinder, the engine load after a large heat generating permanent deformation.

3、柴油機加工精確度差。由于整體變形量較大，造成連桿大頭在軸頸上靠一側并且無端隙、曲柄連桿機構的中心與缸套中心不重合等，導致活塞偏磨，運行后與缸壁的間隙增大而使氣缸壓縮力不足；連桿則因受力不良，小頭的一側受力較大，產生疲勞而斷裂破損。
Diesel machining accuracy is poor. Due to the large amount of overall deformation caused by the connecting rod journal on one side and unprovoked gap center and cylinder crank linkage centers do not coincide, leading to the piston side wear, running increases with the cylinder wall clearance leaving the cylinder compression force is insufficient; link is due to poor power, larger force head on one side, resulting in fatigue and fracture damage.
4、柴油機缸壁間隙過小、活塞裙部橢圓度太小，導致運行時活塞膨脹，與缸套的摩擦力增大甚至咬死，致使連桿小頭受力超出設計應力而斷裂。連桿大頭在軸頸上無端隙、曲軸軸向推力軸承軸向、間隙太小、連桿大小頭軸瓦中心線不平行等，造成活塞偏磨，連桿小頭受彎曲力的作用而斷裂。活塞與套的間隙不正確，無潤滑。
Diesel engine cylinder wall clearance is too small, too small piston skirt ellipse, resulting runtime piston expansion, and increased friction liner or even killed, resulting in a small head rod force beyond the design stress fracture. Connecting rod journal unwarranted gap in the crankshaft axial thrust bearing axial clearance is too small, the size of the connecting rod bearing head is not parallel to the centerline, resulting in partial wear piston, connecting rod head bent by the force and effect of the fracture. Clearance between the piston and the sleeve is not correct, no lubrication.