I am Rajiv from India , Kerala . This video as well as the video for Repair of Vane pump , have been of immense help for me . I am grateful for them . Thank you very much .
Be careful during mid stroke bypass test not to apply pressure from piston side with rod outlet blocked! This will cause pressure amplification by rod-piston ratio and can damage the cylinder if you exceed rated pressure.
Mid stroke testing is wrong. If the port is blocked , and the cylinder is full of oil, the rod wont move even if the piston seals are removed. For mid stroke testing, the piston rod has to be physically restrained in a frame in the mid stroke position and pressure applied. If oil continues to comes out from one end , the cylinder or piston has a issue.
