Allied Hy-Ram HR270, Safety, Operation And Maintenance Instructions, Page: 46 / 60

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12.0 Back Head and Accumulator Gas Charge
12.1 Back Head and Accumulator
1)
Gas Charge
The Back Head contains nitrogen gas (N2) under
pressure. The gas assists with the downward stroke
of the piston during the power stroke phase of the
operating cycle.
The accumulator is a self-contained pressure vessel
with an elastic membrane that divides the inner
housing into a pair of expansible chambers. The
lower chamber is used to receive, store and
discharge pressurized oil. The upper chamber is filled
with nitrogen gas.
After membrane replacement, the accumulator must
be pre-charged with nitrogen (N2) gas. This is
accomplished with the charging tool (Fig. 12-2) and a
commercially available nitrogen bottle.
Fig. 12-1 N
2
Gas Charge in Back Head
WARNING
Only qualified personnel, having
knowledge of the machine’s systems,
proper test equipment and tools
should attempt accumulator repairs.
Prevent injury from unexpected
release of high pressure gaseous
energy. The gas must be released
before disassembly of accumulator
and back head.
Protective eyewear must be worn
when servicing the accumulator.
Fig. 12-2 N
2
Gas Charge in Accumulator
Table 12.1 N2 Gas Charge Kit
Item Part No. Description Qty Remarks / Specifications
1 575427 N2 Gas Charge Kit 1 Kit Kit includes 2,3,4,5
2 --- Charge Tool and Gauge 1 (Fig 12-1 & 2 “Charging Block”)
3 --- Extension 1 (“Adaptor”)
4 --- Hose 1
5 --- Gas Bottle Adapter 1
6 N/A Nitrogen N2 Gas Bottle 1 Not Supplied (Source Locally)
Read, understand and follow all instructions for the safe and proper use of this tool.
1)
Not all models are equipped with accumulator.