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Hydraulics is heavy ans prone to messy leaks. Hydraulics has much higher pressures than pneumatics and requires much more power.
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1) Cost. Hydraulics is heaps costlier than pneumatics.
2) The application does not need precise control, which pneumatics cannot provide. Pneumatics is more "go" or "no go", unlike hydraulics, that can have any state or speed between"go" and "no go".
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1. Person's lack of knowledge as to which is better suited for the application.
2. Person getting a little kick back (bach chee) from the pneumatic system sales representative.
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No reason because the machine comes with it !
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Not sure.
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