Beisler 739-23-1 Installation Manual - Manual (Page 10)

3.7.2 Adjustment of operating pressure
The operating pressure of the sewing machine is 6 bar.
This pressure is displayed on manometer 2.
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To adjust the operating pressure, pull handle 1 up and turn.
Increase pressure = turn handle 1 clockwise
Reduce pressure = turn handle 1 anticlockwise
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