
11.2.9 Refilling the Precharge
Chamber
(Refer to Figure 11-5.)
~
WARNING
The nitrogen precharge chamber
shall only be filled with 99,8% pure
nitrogen gas. Make sure no other
gas, e.g. air or oxygen, is allowed
into the precharge chamber: THIS
COULD RESULT IN AN
EXPLOSION!
When the pressure in the nitrogen
precharge chamber drops more than 15 psi
(1 bar) at 70
o
F. (21
o
C.) or 20 psi (1.5 bar) at
150
o
F. (65
o
C.), the chamber must be re-
filled as follows:
1. Connect nitrogen regulator valve to ni-
trogen cylinder.
2. Clean the area around fill valve plug on
cylinder head.
3. Connect one nozzle of the filling hose to
the nitrogen regulator valve.
4. Back out the nitrogen regulator pres-
sure adjustment.
5. Open valve on nitrogen cylinder.
6. Remove plug from fill valve
G
.
7. Carefully blow out filler assembly to re-
move any internal foreign matter.
8. Press free nozzle of filling hose into fill
valve
G
. Maintain in this position by ap-
plying a steady but moderate force.
9. Open the nitrogen regulator valve
slowly allowing nitrogen into precharge
chamber. Pressure increase can be read
on the pressure gauge.
10. Allow approximately 15 seconds for gas
chamber in Street Hammer to fill, or,
under quiet conditions, until the gas can
no longer be heard entering the cylinder
head.
11. Close the nitrogen cylinder valve when
the reference value has been reached.
Quickly remove fill nozzle from fill
valve. The fill valve check will automati-
cally close to seal. Refer to the table on
page 11-6 for the correct pressure. Pres-
sures are given for temperatures at
70
o
F. (21
o
C.) and 150
o
F. (65
o
C.)
12. Bleed remaining gas from regulator and
disconnect it from nitrogen tank. Recap
tank.
~
CAUTION
Use only the hose nozzle to relieve
the precharge chamber pressure.
Using nails, screwdrivers or similar
objects will damage the fill valve.
13 Press free nozzle of test hose into fill
valve
G
and read pressure.
14. Make any adjustments necessary so that
the correct pressure is set.
15. Close fill valve
G
with screw plug.
11-7
6-1-03
A
LLIED
Street Hammer
AS Series
Nozzle
G
Pressure
Relief
Valve
Pressure
Gauge
Minimess
Connection
Gas Cylinder
Valve
Figure 11-5. Filling the Nitrogen Precharge
Chamber
Summary of Contents for AS 342
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