The fuel injection pump is the most precise assembly of the diesel engine and the heart of the diesel engine. Many parts of the fuel injection pump assembly have lead seals, which are not allowed to be removed, adjusted or decomposed at any time during use. Only after a comprehensive inspection is made to confirm that its performance has deteriorated, can it be repaired at the service point of the fuel injection pump. When the fuel injection pump is in poor working condition, it can be eliminated by adjusting method.