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Unreasonable lubrication methods and structural design flaws in the planetary reducer have led to its unreliability in use. The problems that arise are, first, a reduced service life, and second, high levels of noise and vibration, which lead to frequent maintenance. Moreover, every time it is serviced, the eccentric bearing and pin gear sleeve must be replaced, which increases the maintenance costs. The operation of bearings is not very stable; due to the effect of gravity and the vibrations generated by mechanical motion, slight displacements occur in the axial position of the bearings. This relative movement is highly detrimental, as continuous shocks can cause the elastic retaining rings to deform or break, leading to the risk of the bearings falling off the shaft. Even if the bearings do not fall off, vibrations can still result in significant noise. The lubrication method used in planetary gear reducers is also a factor that can lead to poor lubrication. The splash lubrication method is mainly used in applications with high rotational speeds; it is clearly not suitable for situations with moderate loads and low rotational speeds. A closed-type, full-life gearbox with a long service life and low maintenance requirements; it is used for boiler feedwater gearboxes, toothed chain variable speed transmissions, and the lubrication of planetary reducers, and can also be utilized for lubricating centralized grease supply systems. When selecting grease for the bearing load of a walking planetary reducer, grease with a low penetration value should be chosen for high loads. When operating under high pressure, in addition to a low penetration value, it is also necessary to have high film strength and extreme pressure properties. When selecting grease based on environmental conditions, calcium-based greases are insoluble in water and are suitable for dry environments with low moisture levels. When selecting grease based on the operating temperature, the key parameters are the drip point, oxidation stability, and performance at low temperatures. The drip point is generally used to assess high-temperature performance, and the actual operating temperature of the bearing should be 10–20°C lower than the drip point. The operating temperature of synthetic grease should be 20-30°C below its drip point.