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The maintenance of the camshaft and roller drive parts of the injection pump is an important part of the injection pump maintenance, and the cam and roller drive parts play an irreplaceable role in the pump. The contact between cam and roller of camshaft will be worn, and groove will be formed when serious, so that the law of oil supply changes. When the ball bearings at the two ends of the camshaft are worn, the axial clearance of the camshaft will increase and noise will occur in the operation of the fuel injection pump. The clearance between camshaft and bushing increases to 0.15 mm, which will cause abnormal operation of the governor and seriously affect the performance of the diesel engine.