Welcome to the Rebuild & Repair Cylinders group of SmartGuy.com. Feel free to interact with other professionals from across the world. You can find professionals, find deals on services, find professionals who might barter, or simple post questions, comments, or suggestions. Hydraulic cylinders form the heart of many hydraulic systems and often need to be disassembled and rebuilt. Inspection of the leakage issue and scrutinizing cylinder parts, especially the seals, is helpful in recognizing the exact problem and choosing the repair options accordingly.