Maintenance
All
S
P Rock Valve Model
s
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Operation Manual -
111
d. Remove the valve guard and gas valve cap
from the accumulator (Figure 52).
e. Back the T handle of the gas chuck all the way
out (counter clockwise) before attaching the
charging assembly to the accumulator gas
valve.
f. Close the bleed valve and disconnect the hose
from the valve body. This will insure that the
initial pressure reading is accurate, and prevent
the pressure from escaping out of the filling
hose.
g. Screw the swivel nut to the gas valve of the
accumulator and tighten to 10 to 15 inch/
pounds.
h. Grasp the T handle on the gas chuck and turn it
clockwise all the way down. This will press a
pin into the gas valve, opening it. Read the
pressure before you even hook up the nitrogen
bottle. This prevents you from trying to add
gas to an already overcharged accumulator. If
the pressure is at or above the desired setting of
1450 PSI, skip to point l. If the pressure is low,
continue to the next step.
i. Make sure that the nitrogen supply is shut off.
Attach the regulator assembly to the nitrogen
bottle. Attach the hose to the high pressure
regulator and to the gas valve on the charge
valve assembly.
j. Back off the high pressure regulator
adjustment handle by turning counter
clockwise.
k. Crack open the nitrogen valve (on the nitrogen
bottle), raise the pressure of the regulator
adjustment handle, and
SLO
W
LY
fill the
accumulator. Shut off the supply when the
gauge indicates the desired nitrogen
pre-charged pressure.
NOTE!
If the nitrogen
bottle doesn't have at least 1450 PSI pressure,
you will not be able to charge the accumulator
to 1450 PSI.
l. If the desired pre-charge is exceeded, close the
nitrogen bottle valve, then
SLO
W
LY
open the
bleed valve. Close the bleed valve when the
desired pressure is reached.
NOTE!
Ne
v
er Let Nitro
g
en O
u
t Of The
Acc
u
m
u
l
a
tor By Pressin
g
The G
a
s V
a
l
v
e Pin
W
ith A
F
orei
g
n Object. The Hi
g
h Press
u
re
M
a
y
Rup
t
u
re The V
a
l
v
e Se
a
t!
m. Let the pre-charge sit for 10 or 15 minutes.
This allows the gas temperature to stabilize.
n. Recheck the gauge pressure. Add or release
nitrogen until the pre-charge is correct. Be sure
that the bleed valve is closed before adding
pressure.
o. When finished pre-charging, screw the T
handle of the gas chuck all the way out, then
open the bleed valve.
p. Hold the gas valve on the accumulator, and
unscrew the swivel nut. Remove the assembly.
q. Mix some soap and water to make a bubbly
mixture. Spread it around the gas valve cap to
check for leaks. If a leak is found, replace the
accumulator, or have it repaired by qualified
personnel. Do not attempt the repair yourself.
r. Replace the gas valve cap (tighten to 10-15
inch/pounds). Replace the valve guard. The job
is complete.
HYDAC
b
ladder
Accumulator
Valve Seal Cap
Valve Protection Cap
Valve Stem
O-ring
accum closeup
Figure 52
S
howing the accumulator ga
s
valve cap and valve guard
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