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A hydraulic puller is a tool that uses hydraulic force to remove tight-fitting parts like gears, bearings, and pulleys from machinery. It generates high pulling force with minimal physical effort, making it easier and safer than mechanical pullers for heavy-duty applications. The tool works by using a hydraulic cylinder, pressurized with fluid (usually oil), that pushes on a central rod to extend jaws or arms that grip the component, pulling it out as the pressure increases.