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I am not 100% sure but I think it is to increase the application pressure.
Normal hydro systems produce about 3500 psi
International have an electric over hydro to increase the pressure
On Large construction Equipment like articulated trucks and loader they have air over nitrogen charged actuators those actuators are charged at 6500 psi.
On class8 trucks it only takes 30-60 psi of air but the leverage on the slack adjusters multiplies the force so many pounds for each inch of leverage.
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