Hyundai HL955 Manual page 504

11. RIDE CONTROL SYSTEM (option)
1) ACCUMULATORS
(1)
Pre-charging
Use an inert gas such as nitrogen for pre-charging
accumulator.
※
Do not use oxygen or shop air.
※
Nitrogen source and all components must be
rated for a pressure at least as high as the
nitrogen source.
Accumulator having gas valve as per figure 1.
①
Remove gas valve guard and gas valve cap.
②
Back gas chuck "T" handle (A) all the way out
(counter clockwise) before attaching charging &
gauging kit to accumulator gas valve.
③
Close bleed valve (B).
④
Making sure not to loop or twist the hose,
attach swivel nut (C) to gas valve and tighten
11.5~17 kgf·cm (10~15 lbf·ft).
⑤
Turn gas chuck "T" handle (A) until the gauge
starts showing the pressure in the accumulator.
Do not turn the "T" handle all the way down, as
it will damage the valve core.
⑥
Crack open nitrogen bottle valve (D) and slowly
fill accumulator. Shut off when gauge indicates
desired pre-charge.
⑦
Let the pre-charge set for 10 to 15 minutes.
This will allow the gas temperature to stabilize.
If the desired pre-charge is exceeded, close
nitrogen bottle valve (D), then slowly open
bleed valve (B). Do not reduce pre-charge by
depressing valve core with a foreign object.
High pressure may rupture rubber valve seat.
⑧
When finished pre-charging accumulator, turn
"T" handle (A) all the way out on gas chuck,
then open bleed valve (B).
⑨
Hold gas valve to keep from turning, loosen
swivel nut (C), remove assembly. Check for pre
-charge leak using a common leak reactant.
⑩
Replace gas valve cap 11.5~17 kgf·cm (10~15
lbf·ft) and valve guard. (Gas valve cap serves as
a secondary seal.)
(2) Pre-charge checking procedure
Using appropriate valve in the hydraulic system,
discharge all oil from accumulator and allow
piston to bottom against hydraulic end cap.
Valve core
B
A
C
Charging and gauging kit (31LM-90100)
6-40
Figure 1
WLACC01
D
WLACC02