VI. Service and maintenance
G. How to charge nitrogen gas into back head and accumulator a) Back head gas charging
1. Open valve cap.
2. Connect hose to adapter.
3. Close gas cylinder valve, connect gas charging kit to gas cylinder, close 3-way valve and drain cock.
4. Fit adapter on the inlet port by tightening middle section of adapter.
5. Tighten top section of adapter.
6. Open gas bottle valve SLOWLY. Quick valve opening may cause damage on the gauge.
7. Open 3-way valve slowly, charge N2 gas up to 20 kg/cm², close the valve.
8. Drain the gas to 16~18 kg/cm² upon ambient temperature of job site.
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