1) Keep the machine running with cocks closed.2) Loosen the lock-nut (2) fig. (13)3) Tighten the regulation screw (1) to increase the pressure.Loosen regulation screw (1) to reduce the pressure.4) Re-secure the counter-nut (2).5) Slightly open the air delivery cock for 3-4 seconds in order to accelerate the motor, then close again. Repeat this operation 2 - 3 times for valve positioning.
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