Komatsu 830E-AC Shop Manual page 541

2. Remove charging valve cap. Turn the charging
valve swivel nut (small hex) counterclockwise
three full turns to unseat valve seal. DO NOT
TURN LARGE HEX. The charging valve body
has a bleeder groove in its mounting threads,
but for safety of all personnel, the valve body
MUST NOT be loosened until ALL nitrogen
pressure has been vented from the suspension.
3. Depress the charging valve core to release
nitrogen pressure from the suspension. When
nitrogen pressure has been vented to atmo-
sphere, loosen and remove the fill plug. The
suspension should have collapsed slowly as
gas pressure was released. Truck weight is now
supported by the support blocks.
4. Use a plastic tube to help bleed off trapped air
inside the piston. Remove vent plugs and the
bleeder screw. Service the suspension with
®
clean HYDRAIR Oil (with 6% friction modifier)
until clean oil comes out of the port where the
bleeder screw and plug were removed from the
side of the housing. Drip pans should be used
and all spillage cleaned from the outside of the
suspension. Install the bleeder and vent plugs.
Continue to fill the oil until it reaches the fill port.
Allow the suspension to stand for at least 15
minutes to clear any trapped nitrogen and/or air
bubbles from the oil. Add oil if necessary, and
install the fill plug.
REAR SUSPENSION DIMENSIONS (EMPTY)
TRUCK MODEL & OILING
OPTIONS HEIGHT
mm (IN.)
830E 25.4 (1.0)
830E 25.4 (1.0)
* Note: Charging pressures are for reference only and may vary depending on body
weights.
H04025
CHARGING *CHARGING
HEIGHT PRESSURE
mm (IN.) kPa (psi)
241 (9.5) 1724 (250)
241 (9.5) 217 (2315)
Oiling and Charging Procedures
FIGURE 4-4. REAR SUSPENSION
Rear Suspension Nitrogen Charging
Lifting equipment (overhead or mobile cranes, or
hydraulic jacks) must be of sufficient capacity to
lift the truck weight. Be certain that all personnel
are clear of lift area before lift is started. Clear-
ances under the truck may be suddenly reduced.
Ensure the automatic apply circuit has not
applied the service brakes during truck mainte-
nance. If the front brakes are applied during rear
suspension charging, the axle cannot pivot for
frame raising / lowering, and the rear suspension
may be unable to move up or down.
H4-9