5. Turn charging valve swivel nut clockwise to
tighten.
a. If the charging valve is being reused, tighten
swivel nut (small hex) to 4 ft. lbs. (5.4 N.m)
torque.
b. If a new charging valve was installed:
1). Tighten swivel nut to 10.5 ft. lbs. (14.2 N.m)
torque and then loosen.
2). Retighten swivel nut to 10.5 ft. lbs. (14.2
N.m) torque and then loosen.
3). Retighten swivel nut to 4 ft. lbs. (5.4 N.m)
torque.
4). Replace valve cap and tighten to 2.5 ft. lbs.
(3.3 N.m) torque (finger tight).
6. Raise truck frame with crane or jacks to release
the nitrogen charging dimension blocks and re-
move blocks. Lower frame and remove lifting
equipment.
7. Replace protective guard over charging valve and
replace the metal covers over the piston rod.
8. The rear HYDRAIR
®
suspensions are now ready
for operation. Visually check piston extension
both with truck loaded and empty. Record exten-
sion dimensions. Maximum downward travel is
indicated by the dirt ring at the base of the piston.
Operator comments on steering response and
suspension rebound should also be noted.
OIL AND NITROGEN SPECIFICATIONS CHARTS
HYDRAIR
®
II OIL SPECIFICATIONS
Ambient Temperature Range Part No. Approved Sources
-30°F & above (-34.5°C &
above)
VJ3911
Mobil 424
Mobil D.T.E. 15
Texaco TDH Oil
AMOCO ULTIMATE
Motor Oil 5W–30
Sunfleet TH Universal Tractor Fluid
Chevron Tractor Hydraulic Fluid
Conoco Power Tran III Fluid
Petro Canada Duratran Fluid
Shell Canada Donax TDL
-55°F & above (-48.5°C &
above)
VJ5925
Emery 2811, SG-CD,
5W–30
Mobil Delvac I, 5W–30
Petro Canada Super Arctic
Motor Oil, 0W–30
Conoco High Performance
Synthetic Motor Oil, 5W–30
NOTE: VJ3911 and VJ5925 oils are not compatible and must not be mixed in a suspension.
VJ3911 and VJ5925 oils are supplied in 5 gallon (19 Liter) cans.
NITROGEN GAS (N
2
) SPECIFICATIONS
Nitrogen gas used in HYDRAIR
®
II
Suspension Cylinders must meet or
exceed CGA specification G–10.1 for
Type 1, Grade F Nitrogen Gas
Property Value
Nitrogen
Water
Dew Point
Oxygen
99.9% Minimum
32 PPM Maximum
-68°F (-55°C) Maximum
0.1% Maximum
FIGURE 4-5. SPECIFICATIONS CHART
H4-6 Oiling and Charging Procedures H04005 9/99
730E, 830E, and 930E
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