How to Interpret Fast Gearbox Model Numbers?
1 Answers
Fast's gearbox numbering rule is: number of forward gears + gearbox structure type + input torque + gear ratio code. Below is a detailed explanation of the meanings of these codes: 1. The first digit of the number is usually the letter C or F. C is the first letter of the English word "China," representing China. "F" stands for the Fast brand. 2. The second and third digits indicate the number of forward gears in the gearbox. According to Fast's product spectrum, there are 5-speed, 6-speed, 7-speed, 8-speed, 9-speed, 10-speed, 12-speed, 16-speed, 20-speed, and 24-speed gearboxes, with the most common being 8-speed, 9-speed, 10-speed, 12-speed, and 16-speed gearboxes. 5-speed, 6-speed, and 7-speed gearboxes are single-box, while gearboxes with 8 speeds or more are dual-box with a main and auxiliary box structure. 3. The fourth digit represents the gearbox structure type, where J stands for mechanical transmission, and D stands for an integrated single-box structure gearbox. 4. The fifth digit indicates the number of intermediate shafts in the gearbox, with S representing a dual intermediate shaft. Currently, all Fast gearboxes feature a dual intermediate shaft design, which offers advantages such as high torque capacity, smooth transmission, and compact axial dimensions. If an additional S follows the first S, it indicates that the auxiliary box has a triple intermediate shaft structure. 5. The sixth digit represents the gear type. QX stands for "full helical gear," meaning both the main and auxiliary boxes use helical gears; if only X is present, it means only the auxiliary box uses helical gears. 6. The seventh digit indicates the material of the gearbox housing. L represents an aluminum alloy housing, while an iron housing is not denoted by any letter. 7. The following numbers represent the gearbox's maximum input torque. Multiplying this number by 10 gives the maximum torque the gearbox can withstand.
