1.Features of EG Gear Reducer
2.Designation and Reduction Ratio
2-1) Designation and Symbols
2-2) Reduction Ratio
3.Selection
3-1) How to select proper gear reducer
4. Service Factor
4-1) Load Classification and Service Factor (Sf)
4-2) Service factor for selection
5. Installation and operation
5-1) General
5-2) Installation
5-3) Operation
6. Maintenance 
7. Power Rating, Thermal Capacity and Dimension
7-1.Nominal Power Rating
1 stage  gearbox
2 stage  gearbox
3 stage  gearbox
4 stage  gearbox
7-2.Thermal Capacity
1 stage  gearbox
2 stage  gearbox
3 stage  gearbox
4 stage  gearbox
7-3.Dimensions
1 stage  gearbox
2 stage  gearbox
3 stage  gearbox
4 stage  gearbox
8. Convenient technical formulas