Locknut Installation; Installation/Removal Of "Dyna-Seal"; Charging Procedure - Komatsu 930E-2 Shop Manual

13. Install washer onto plug and poppet assembly and
push until seated against anti-extrusion ring. (Re-
fer to Figure 3-22).
14. Install O-ring over plug and poppet assembly and
push until seated. DO NOT TWIST O-RING.
15. Install spacer with smaller diameter of the shoul-
der toward shell.
16. Install locknut on plug and poppet assembly and
tighten securely. This will squeeze O-ring into
place. (Refer to Figure 3-23).
FIGURE 3-23. LOCKNUT INSTALLATION
17. Replace pipe plug into plug and poppet assembly.
18. Install accumulator on truck and charge according
to "Charging Procedure".
FIGURE 3-24. INSTALLATION/REMOVAL OF
"DYNA-SEAL"
1. "Dyna-Seal"
2. Accumulator Charging Valve
J03019 1/99
3. Accumulator
Brake Circuit Component Service

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 nitrogen 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 3-24.
2. Attach swivel connector of hose assembly to gas
valve. Hand tighten sufficiently to compress gas-
ket swivel connector in order to prevent gas leak-
age.
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 10 psi (69 kPa)
before completely tightening the valve stem nut.
With wrench on valve stem flats, tighten valve
stem nut.
4. Proceed to inflate accumulator to 1400 ±50 psi
(9653 ± 345 kPa) pressure by slowly opening the
pressure regulator valve on nitrogen cylinder,
closing it occasionally to allow needle on pressure
gauge to stabilize (thus giving accurate reading
of precharge pressure). When correct 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:
Bleed all hydraulic pressure from the system using the
bleed valves on the brake manifold. Remove valve
guard and "Dyna-seal". Then, follow "Charging Proce-
dure", Steps 1 thru 6.
J3-25