NPK PH1 Operator's Manual page 63

GAS CHARGE
CHECKING THE GAS PRESSURE
6. Turn the T-handle (g2) clockwise. As the
T-handle is screwed in, a resistance is
encountered. By turning the T-handle
further, the nitrogen gas pressure will be
indicated on the pressure gauge (g8). Stop
turning the T-handle when the gauge reads
pressure. Do not overtighten!
7. Compare the gauge pressure with the NITROGEN GAS PRE-CHARGE chart in the
NITROGEN GAS PRESSURE section. If the gas is 25 psi (2 bar) or more below the
specification, proceed to the NITROGEN GAS CHARGING PROCEDURE section of
the manual. If the pressure is correct, go to the next step.
8. Turn the T-handle counterclockwise until it stops, as in step 3.
9. Slowly loosen the charge adapter cap to relieve the nitrogen gas pressure trapped in
the charge valve.
10. Remove the charge adapter from the hammer charge valve.
11. Replace the charge valve cap on the charge valve.
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