Allied Hy-Ram HR270, Safety, Operation And Maintenance Instructions, Page: 49 / 60

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12.0 Back Head, Accumulator Charge – [cont’d]
The following procedures are accomplished with the
use of the N2 charging unit, part number 575427, and
a commercially available bottle of nitrogen. Refer to
the list of “Tools Required” for other tools needed.
12.3.1 Tools Required

Charge Kit 575427 (Fig. 12-2)
Source additional equipment locally:

Nitrogen Bottle (equipped with a pressure
regulator is recommended)

Wrench

Hex wrench

Torque Wrench

Light weight oil

Rags
12.3.2 Connecting the Charge Tool (Fig. 12-2)
1. Clean immediate area around the charge port.
2. Use wrench to remove hex cap on accumulator
valve.
3. Remove hex plug on top of accumulator.
4. Inspect condition of O-ring on charge tool. Close
bleed valve.
5. Thread the charge tool into the charge port.
6. Attach hose to the charge tool and nitrogen
bottle.
12.3.3 How to Measure Accumulator Pressure
WARNING
For the purpose of these instructions, the nitrogen
bottle is equipped with a pressure regulator.
Connect charge tool as described in Section 12.3.2.
(Step 6 is not required to measure pressure).
IMPORTANT
Gas pressure is sensitive to temperature. Note that
the charge pressure shown in technical data section
of this manual is at 70

ambient. Fluctuations in
pressure will be seen as the temperature changes
between ambient and working temperatures.
1. Depress valve handle on charge tool.
2. Read pressure gage *.
3. *If +/- 5% of specification, no adjustment is
necessary. If so, remove charge tool from
accumulator following instruction in Section
12.3.5.
4. *If > +/- 5% of specification adjustment is
required. Follow the instructions described in
Section 12.3.4 of this manual for charging the
accumulator.
12.3.4 Charging the Accumulator
1. Follow steps 1-5 for connecting the charge tool.
2.
Slowly open valve on nitrogen bottle.
3. Adjust the regulator to value specified in the
Technical Data S 50 PSI above.
4. Depress and hold valve handle. Allow 1 – 3
minutes for gas to transfer.
5. Release valve handle. Wait 5 to 15 minutes for
temperature of gas inside accumulator to
stabilize.
6. Depress valve handle to recheck gas pressure.
Make final adjustments according to value
specified in Technical Data Section.
12.3.5 Charge Tool Removal
1. Close valve at accumulator.
2. Close valve at nitrogen bottle.
3. Open bleed valve.
4. Remove
charge tool.
5. Check for gas leak. Use light weight oil around
charge port. Bubbles indicate leak.
6. Clean oil from charge port
7. Install hex plug and tighten with torque wrench to
15 lb-ft [20 Nm].
8. Install hex cap on accumulator valve.
9. Store nitrogen tank according to regulations.
10. Store charge tool in dry location.