Komatsu 830E-AC Shop Manual page 539

Front Suspension Nitrogen Charging
Lifting equipment (crane 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. Clearances under the truck
may be suddenly reduced.
1. If removed, install the charging valve with new
O-ring (9, Figure 4-3). Lubricate the O-ring with
®
clean HYDRAIR oil.
FIGURE 4-3. CHARGING VALVE
1. Valve Cap
2. Seal
3. Valve Core
4. Swivel Nut
5. Rubber Washer
H04025
6. Valve Body
7. O-Ring
8. Valve Stem
9. O-Ring
Oiling and Charging Procedures
2. Tighten valve body (large hex, 6) to 16.5 ft lbs
(22.4 N·m) torque. The valve swivel nut (small
hex, 4) must be unseated by turning counter-
clockwise three full turns.
Dry nitrogen is the only gas approved for use in
®
HYDRAIR II suspensions.Charging
components with oxygen or other gases may
result in an explosion which could cause fatali-
ties, serious injuries and/or major property dam-
age. Use only nitrogen
specifications shown in chart (Figure 4-5).
®
3. Install HYDRAIR Charging Kit and a bottle of
pure dry nitrogen. Refer to Installation of Charg-
ing Kit.
4. Charge the suspensions with nitrogen gas to
50.8 mm (2 in.) greater than the charging height
listed in Figure 4-2. Close inlet valve (4, Figure
4-1).
5. Remove the oiling blocks from the suspensions
and install the nitrogen charging blocks. Secure
the blocks to prevent accidental dislodging.
NOTE: Use caution to prevent damage to plated cyl-
inder surfaces and oil seals when installing the
blocks.
6. Remove the center hose from manifold (6).
7. Open inlet valve (4) until the pressure has
dropped below the pressure listed in Figure 4-2,
and then close the valve.
8. Install the center hose to manifold (6).
9. Charge the suspensions to the pressure listed
in Figure 4-2. DO NOT use an overcharge of
nitrogen to lift the suspensions off of the charg-
ing blocks.
10. Close inlet valve (4, Figure 4-1). Leave outlet
valves (3) open for five minutes in order to allow
the pressures in the suspensions to equalize.
of these
gas meeting the
H4-7