It seems like you are referring to a gear set for a specific model or equipment, namely "LJ1010 1020." However, there isn't enough context to pinpoint exactly what you're looking for. The "LJ1010 1020" could be related to a specific machinery, vehicle, or mechanical system.

If you're referring to a gear set for a machine, vehicle, or other specialized equipment (for example, a tractor, industrial machine, or automotive component), the gear set could be part of a larger mechanical system, such as a transmission or drive assembly.

Could you provide more details about the equipment or machine you're referring to? This would help in providing more accurate information about the gear set.