The installation steps of the truck rear door chain are as follows.
1. Prepare tools and materials: chains, sprockets, screwdrivers, screws, and nuts.
2. Determine the length of the iron chain, and use iron pliers to cut the chain according to the required length.
3. Install sprockets on both sides of the truck's rear door, which can be fixed with screws and nuts.
4. Fix one end of the iron chain to the iron ring on the rear door of the truck. You can use screws and nuts to fix it.
5. Pass the other end of the iron chain through the sprocket and fix it on the iron ring on the truck body. You can also use screws and nuts to fix it.
6. Adjust the length of the iron chain so that the chain tension is moderate after the door is closed, not too loose or too tight.
7. After the installation is completed, the firmness of the iron chain can be tested multiple times to ensure that it can withstand the weight of the goods and the vibration during transportation.