Assembling the hydraulic final drive motor can seem like a daunting task, but with the right tools and knowledge, it can be a relatively straightforward process. Here are the steps you'll need to follow to assemble the rotary components of your hydraulic final drive motor:

1. Begin by gathering all the necessary tools and materials. You'll need a hydraulic pump, a hydraulic motor, a mounting plate, bolts, seals, and any other rotary components specific to your motor. Make sure you have everything you need before you get started.
2. Next, attach the mounting plate to the hydraulic motor. You'll need to use bolts to secure the plate in place. Make sure the bolts are tightened firmly, but be careful not to overtighten them as this can cause damage.
3. Once the mounting plate is securely attached to the hydraulic motor, you can move on to installing the seals. These seals are important as they help prevent any leaks in the system. To install the seals, simply place them in the designated grooves on the mounting plate.
4. With the seals in place, you can begin assembling the rotary components of the motor. These may include the drive shaft, gears, and any other moving parts specific to your motor. Follow the manufacturer's instructions for assembling these components, making sure to tighten all bolts and connections firmly.
5. With the rotary components assembled, you can attach the hydraulic pump to the motor. First, you'll need to connect the pump's inlet port to the motor's inlet port using a hose. Then, connect the pump's outlet port to the motor's outlet port using another hose. Make sure the hoses are tightened firmly to prevent any leaks.
6. Now it's time to install the bolts that will hold the pump and motor together. Again, make sure these bolts are tightened firmly, but be careful not to overtighten them.
7. Finally, it's time to test your hydraulic final drive motor. Fill the system with hydraulic fluid and turn the pump on. The motor should start to rotate, indicating that the assembly is complete. If the motor doesn't rotate, you may have a leak somewhere in the system. Double-check all the connections and seals to make sure everything is tightened properly.

Assembling the rotary components of a hydraulic final drive motor can be a challenging task, but with careful attention to detail and the proper tools, it's certainly achievable. Just be sure to follow these steps and take your time, and you'll have a fully functional hydraulic final drive motor in no time.