Komatsu 830E-AC Shop Manual page 577

Charging Procedure
1. Mount hose assembly gland nut on pressure
regulator.
Pure dry nitrogen is the only gas approved for
use in brake accumulators. Accidental charging
of oxygen or any other gas in this component
may cause an explosion. Be sure pure dry nitro-
gen gas is being used to charge accumulators.
NOTE: Remove Dyna-seal or O-ring (if equipped)
prior to attaching connector to accumulator gas
valve. Refer to Figure 3-23.
2. Attach swivel connector of hose assembly to
gas valve. Hand tighten sufficiently to compress
gasket swivel connector in order to prevent gas
leakage.
NOTE: If leakage is still present, replacement of the
small copper washer in the swivel connector may be
necessary.
3. Precharge bladder slowly to about 69 kPa (10
psi) before completely tightening the valve stem
nut. With wrench on valve stem flats, tighten
valve stem nut.
J03034
4. Proceed to inflate accumulator to 9653 ± 345
kPa (1400 ± 50 psi) pressure by slowly opening
the pressure regulator valve on nitrogen cylin-
der, closing it occasionally to allow needle on
pressure gauge to stabilize (thus giving accu-
rate reading of precharge pressure). When cor-
rect precharge has been reached, close
pressure regulator valve on nitrogen cylinder
securely.
5. Bleeder valve can be used to release any gas
pressure in excess of desired precharge.
6. Replace Dyna-seal and valve guard over valve
stem.
NOTE: For recharging only:
Exhaust all hydraulic pressure from the system.
Remove valve guard and Dyna-seal. Then, follow
Charging Procedure, Steps 1 thru 6.
Brake Circuit Component Service J3-23