Each part of a cylinder that is disassembled at S&T is inspected and assessed. Is the gland within tolerance to properly support and maintain alignment in the application? Was the proper seal material used for fluid compatibility and longevity? Why did the cylinder fail? Can we rebuild this cylinder in a way that will give it a longer life in the application? All these questions are answered during the cylinder assessment and presented to the customer with a repair quotation.
Based on the assessment and inbound cylinder report all cylinder parts are cleaned and inspected again before repair process begins. We double check measurements and materials and then begin. Typical scope of work includes honing the cylinder, capabilities over 12” bore, chroming the rod, re-sealing complete and testing.
Each rebuild cylinder must pass a hydraulic pressure test. We extend and retract the cylinder rod and examine all sealing areas at length for external leaks; tube ends, cushion adjustment screws, gland area, welds. We continue operating the cylinder until we have reached maximum cylinder operating pressure with no external leaks. Once this test has passed we move on to the internal bypass test. How do you know if the cylinder has passed each test? Simple. No leaks. No external leaks and 0mL of internal bypass allowed. A cylinder is only shipped if it passes this test.