A hand-operated hydraulic pump is a manual device that uses mechanical effort to pressurize hydraulic fluid (usually oil), which is then used to power hydraulic cylinders, tools, or systems.

How It Works:
1. You pull or push the handle, which moves a piston inside the cylinder.

2. This movement draws fluid from the reservoir and then forces it out under pressure.

3. The fluid travels through hoses to power hydraulic equipment like a jack, cutter, or expander.