One of the main reasons why hydraulic motor seal kits are necessary is to prevent fluid leakage. The seals and O-rings in the kit create a tight barrier that prevents hydraulic fluid from escaping the system. If the seals are worn or damaged, fluid can leak out, leading to a loss of pressure and reduced performance. This can result in slower operation, increased energy consumption, and potential damage to other components in the hydraulic system. By replacing the seal kit regularly, you can avoid these issues and ensure that your hydraulic motor operates at its best.