1. The bearing preload of the Manual Fertilizer Seeder is too large, the gear gap is too small, the working temperature increases, the friction resistance increases, heat is generated, and the gear box temperature decreases. The pre-tightening torque on the gearbox bearing must be adjusted according to the clearance adjustment regulations. 2. The lubricating oil level is too low or too high: If the oil level is too low, the surface of the rotary joint cannot be sufficiently lubricated and frictional heat is generated. If the oil level is too high, the friction area between the rotating surface and the oil will increase, resulting in deterioration of the lubricant and poor lubrication effect. Therefore, when the gearbox is filled with lubricant, the crease on the dipstick should be the standard line. 3. Another reason is that the Manual Fertilizer Seeder will be overloaded for a long time, the gear bearing is too large, the lubricating film on the surface will be damaged due to shearing, and the frictional heat will increase. The correct selection of the working speed of the tractor can not only maximize productivity and economy, but also extend the service life of the tractor. This is the case for the overheating of the Manual Seeder gearbox, I hope it will help you.