NITROGEN GAS CHARGING
The Accumulator has a rubber bladder inside it that contains nitrogen gas under pressure. When there is no oil in the Accumulator and the pressure gauge reads "0", the bladder still has pressure in it. This is the pre-charge pressure. The pressure amount is indicated on the accumulator label(9). As oil is pumped into the Accumulator, the bladder gets smaller and this increases the pressure. To check the gas pressure, raise and lower the boom until the Pressure Gauge reads “0”. Using either the Hand Pump or Electric Pump, start pumping oil. The Pressure Gauge will 'jump' from zero to a higher pressure and then appear to stop moving momentarily. This is the nitrogen gas pre-charge pressure. WARNING: Nitrogen gas charging and discharging should only be done by an experienced professional. To add nitrogen gas to the Accumulator, be sure the Pressure Gauge reads “0”, remove the cover plate over the Accumulator, remove the Accumulator Gas Valve Cap(10) on the end of the Accumulator(9), then attach a Gas Charging Apparatus(38) to the Valve Stem as shown in Figure H6 and charge to the specified psi. To check the gas pressure, see above paragraph. To reduce the nitrogen gas pressure or remove it completely , be sure the Pressure Gauge reads “0”, remove the cover plate over the Accumulator, remove the Accumulator Gas Valve Cap(10) on the end of the Accumulator, then attach a Gas Charging Apparatus to the valve stem and discharge the gas slowly through the apparatus.	Figure H5 Figure H6 9 Accumulator 10 Accumulator Gas Valve Cap 38 Gas Charging Apparatus
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