New Holland CX720 Repair Manual page 1662

Install the air compressor drive belt (1) onto the air
compressor (2) and engine crankshaft pulley. Turn the
belt tension adjusting bolt (3) clockwise until the belt is
tight. Tighten the three air compressor mounting nuts (4)
when the belt is adjusted properly. Adjustment is correct
when the belt deflection is 3 mm (1/8 in) in the center of
the belt, with a force of 23 N (5.2 lbf ) applied to the belt.
29. Connect the oil hose (5) to the air compressor (2) and
tighten the fitting (6) securely.
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