In the maintenance of agricultural machinery, the installation and commissioning of fuel injection pump are often encountered. In order to improve the maintenance technology of the fuel injection pump, this paper explains in detail the precautions for the removal and assembly of the injection pump, the post installation and commissioning technique of the injection pump and the installation method of the injection pump on the machine. (1) when the injection pump is removed, remember (or mark) the injection pump gear is meshing with which gear tooth, or the spline fixed screw is a hole, or the coupling between the coupling disk and the transmission shaft. After the fuel pump is discharged from the engine, it can no longer turn the crankshaft, otherwise, the fuel supply advance angle will be in disorder. When installing the fuel injection pump, engage, connect and engage according to the original position.