The gearbox is an important component of a truck. During the truck's operation, it is responsible for changing the truck's speed and controlling the direction of travel. Most of the time, we only see the external appearance of the gearbox, and few people have the opportunity to see how the gearbox is assembled. In October, we followed visiting customers to tour a gearbox factory and had the opportunity to learn and see the disassembled gearbox. So how exactly is a gearbox assembled? Let's find out together.

When we arrived at the factory, the engineers first showed us two important countershaft gears in the gearbox. The countershaft, also known as the output shaft, is responsible for power output. "These two countershafts must be precisely aligned during installation to ensure that the gears mesh properly. We usually mark the ends of the countershaft diameter before installation, and then align them with the corresponding gear positions on the output shaft."

After marking the gears, the engineer took out the input shaft. The first step is to secure the input shaft properly, as poor fixation can result in noise and vibration during gearbox operation. After securing the input shaft, the engineer marked the two ends of the gear with the longest diameter on the input shaft and mentioned that these marks would correspond to the marks on the countershaft gears during installation.

During the installation process, the first step is to install the two countershafts and secure the ends of the countershafts with ball bearings to ensure there is no looseness in the rotation of the gearbox bearings. Next, the input shaft will be installed, aligning the marked locations on the input shaft with the countershafts for gear engagement. After ensuring proper installation, the gearbox secondary shaft will be installed last.

The secondary shaft of the gearbox is the largest bearing in the gearbox, which we usually refer to as the output shaft. It is connected to the transmission shaft and the reducer, mainly transmitting power from the engine. Similarly, marks are made at both ends of the secondary shaft diameter, aligning them with the marks on the opposite end of the countershaft during installation. Once this task is completed, the assembly of the gearbox is basically finished. Next, a simple adjustment is carried out by rotating the input shaft to check if all the gears in the gearbox are rotating smoothly without any jamming issues. If all gears rotate smoothly, a brand new gearbox has been successfully assembled.

Overall, the installation of a gearbox requires precise gear alignment, secure fixation of precision bearings, and patient adjustment to assemble a high-quality gearbox. Our customer, who visited our factory, learned about the gearbox assembly process and expressed gratitude for the valuable experience gained by his engineers. He also thanked us for arranging the visit.

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