A hydraulic hollow cylinder jack with a hand pump is a heavy-duty hydraulic lifting and pulling tool used for lifting, tensioning, pulling, and pressing applications in construction, industrial maintenance, bridge work, and machinery installation. It consists of a hollow hydraulic cylinder, a high-strength piston, hydraulic hose, manually operated hand pump, pressure release valve, and couplings. The hollow center of the cylinder allows rods, cables, or bolts to pass through, making it ideal for tensioning and pulling operations. Constructed from high-strength alloy steel with corrosion-resistant finishes, the jack is designed to withstand high hydraulic pressures while providing reliable and precise force.

Operation:
To operate a hydraulic hollow cylinder jack with a hand pump, the cylinder is positioned correctly on a stable surface or aligned with the workpiece, and the hydraulic hose is connected securely to the hand pump. The hand pump is then operated to generate hydraulic pressure, causing the piston to extend and apply controlled lifting, pulling, or tensioning force. Once the required operation is completed, the pressure release valve is opened gradually to retract the piston safely. After use, the equipment should be cleaned, inspected for hydraulic leaks or damage, disconnected, and stored in a clean, dry place to ensure safe operation and extend its service life.