Komatsu 830E-AC Shop Manual page 542

1. If removed, install charging valve with new O-
ring (9, Figure 4-3). Lubricate the O-ring with
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clean HYDRAIR oil.
2. Tighten valve body (large hex, 6) to 22.4 N·m
(16.5 ft lbs) 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
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HYDRAIR II suspensions. Charging of these
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).
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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 4-4.
5. Slowly release gas until the suspensions match
the charging height listed in Figure 4-4.
6. 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.
7. Ensure both of the suspension cylinders are
extended the same distance ± 10 mm (0.39 in.).
If the difference in the extension from side to
side exceeds 10 mm (0.39 in.), check the front
suspensions for equal extension. Adjust the
front as necessary.
H4-10
gas meeting the
Oiling and Charging Procedures
NOTE: A low left front suspension will cause the right
rear suspension to be high. A low right front
suspension will cause the left rear suspension to be
high.
8. Close outlet valves (3) and remove charging kit
components. Refer to Removal of Charging Kit.
9. If the charging valve is being reused, tighten
swivel nut (4, Figure 4-3) to 5.4 N·m (4 ft lbs)
torque.
10. If a new charging valve is being used, tighten
swivel nut to 14.2 N·m (10.5 ft lbs) torque, then
loosen and retighten the swivel nut to 14.2 N·m
(10.5 ft lbs) torque. Again, loosen the swivel
nut and retighten to 5.4 N·m (4 ft lbs) torque.
Replace valve cap (1) and tighten to 3.3 N·m
(2.5 ft lbs) torque (finger tight).
11. Install the protective guards over the charging
valves and install the metal covers over the pis-
ton rods.
Any time the suspensions are recharged, the calibra-
tion of the Payload Meter system is affected. Refer to
the Payload Meter III ™ section and perform a
"Clean Truck Tare". This will ensure accurate pay-
load records.
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The rear HYDRAIR suspensions are now ready for
operation. Visually check piston extension both with
the truck loaded and empty. Record the extension
dimensions. Maximum downward travel is indicated
by the dirt ring at the base of the piston rod. Operator
comments on steering response and suspension
rebound should also be noted.
H04025