OEM PC120-6 swing 2nd planetary gear

Planetary gears, also known as epicyclic gears, are commonly used in heavy equipment like excavators and bulldozers. They are composed of three main components: the sun gear, the planet gears, and the ring gear.

The sun gear is the central gear in a planetary gear set and is typically driven by the input shaft. The planet gears, which are mounted on a carrier, rotate around the sun gear and mesh with the ring gear. The ring gear is fixed to the planetary gear housing and is the outermost gear in the system. As the planet gears rotate around the sun gear, they also rotate around their own axes. This results in a gear ratio that is the ratio of the number of teeth on the sun gear to the number of teeth on the ring gear.

The specifications for the second planetary gear in the swing drive of the PC120-6 may vary depending on the specific production year and the manufacturer of the gear. Generally, the gear's specifications may include the number of teeth, the module or pitch of the gear, and the material it is made of.

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