Allied Hy-Ram HR270, Safety, Operation And Maintenance Instructions, Page: 47 / 60

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12.0 Back Head, Accumulator Charge – [cont’d]
12.2 Back Head N2 Charge – Safety Precautions
Read, understand and follow all instructions for the
safe and proper use of this tool. These instructions
were prepared to assist the qualified technician with
the information necessary for measuring/filling the
back head (figure 12-1). 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.
WARNING
Risk of explosion if filled with
substitute gas or air. Use only dry
nitrogen gas to fill accumulator.
WARNING
Prevent injury from unexpected
release of high pressure hydraulic
energy. If attached to carrier, relieve
all oil pressure inside breaker and
attachment circuit before service.
CAUTION
When working with pressurized
systems, personal protection
equipment, including safety eyewear
must be worn.
WARNING
Crush injury from falling or shifting
loads. All loads must be stable
before service. If breaker is attached
to carrier, lower to a flat stable
surface.
CAUTION
Stay clear of tool to prevent injury
from sudden release. Tool can
extend from breaker when charging
back head.
12.2.1 Tools Required

Charge Kit 575427 (Fig. 12-1)
Source additional equipment locally:

Nitrogen Bottle (equipped with a pressure
regulator is recommended)

Hex wrench

Torque Wrench

Light weight oil

Rags
12.2.2 Connecting the Charge Tool (Fig. 12-1)
1. Clean immediate area around the charge port.
2. Use hex wrench to remove hex plug.
3. Inspect condition of O-ring on charge tool. Close
bleed valve.
4. Thread the charge tool into the charge port.
5. Attach hose to the charge valve and the nitrogen
bottle.
12.2.3 How to Measure Back Head Pressure
WARNING
For the purpose of these instructions, the nitrogen
bottle is equipped with a pressure regulator.
Connect charge tool as described in Section 12.2.2.
(Step 5 is not required to measure pressure).
IMPORTANT
Accurate charging to the specified pressure is
important for proper performance. Charge the back
head with the breaker positioned horizontally and
with no contact pressure on the tool. Charge
pressure shown in technical data section of this
manual is at 70

ambient.
1. Depress valve handle on charge tool.
2. Read pressure gage *.
3. *Over-pressure of > 5% of specification will
require adjustment. Use bleed valve to vent
excess pressure.
4. *Under-pressure > 10% of specification will
require adjustment. Follow the instructions
described in Section 12.2.4 for charging the back
head.