Butter is a lubricant that is often used in the maintenance of agricultural machinery. Because it is sticky, some agricultural machinery hands use it as a binder, but it should be noted that the following places should not be used indiscriminately: 1. The agricultural machinery hand on the piston ring is Avoid misalignment of the piston ring during installation. Applying grease in the ring groove sticks the ring. This is a great hazard. When the engine is working, the butter forms a jelly when it is hot, affecting the elasticity of the piston ring, reducing the sealing performance, and producing carbon deposition, which aggravates the wear of the machine parts. Second, the cylinder pad and some farm hand when loading the cylinder, on both sides of the cylinder pad smeared butter, that can increase the degree of cylinder sealing, and the opposite is true. Because the cylinder temperature rises while the generator is working, the butter will quickly melt away and create voids that cause the cylinder to leak. At the same time, the melting of butter produces carbon deposits that accelerate deterioration of the cylinder pad. Third, the governor has some farm hand for easy installation. Stick the ball with grease in the governor bracket. In this way, the copper balls are not easy to separate under centrifugal force after starting. Once melted into the crankcase, the engine oil deteriorates and cannot be used.