[Shipbuiling Technology] P2 - Keyless coupling install and remove - Keyless method 

When removing the coupling, rather than letting it fly out so fast which could damage the jack piston, one can buffer the force with which the coupling comes out through using the hydraulic jack itself as a buffer. This is how to do it. Leave the filled jack face touching the coupling face and open the venting hole or open the valve on the hydraulic pump so that the fluid oil will return to the hydraulic pump without much resistance. Pump up the coupling and as soon as the coupling is released from the shaft face, it will move back buffered by the oil returning to the pump or bleeding from the vent hole into a container which should be well covered and protected as oil would spray out.

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mục đích của việc này là j vậy

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Kho Hieu ghe

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This people mind not working why are you not make coupling hot