3. Be certain outlet valves (3) and inlet valve (4) are
closed (turned completely clockwise).
4. Turn swivel nut (small hex) on charging valve 3
full turns counterclockwise to unseat valve.
5. Attach charging valve adapters (2) to each sus-
pension charging valve stem.
6. Turn “T” handles (1) clockwise (this will depress
core of charging valve and open gas chamber of
suspension).
7. Open both outlet valves (3).
By selective opening and closing of outlet valves (3),
and inlet valve (4), suspensions may be charged sepa-
rately or together.
Removal of Charging Kit
1. Close both outlet valves (3).
2. Turn “T” handles (1) counterclockwise to release
charging valve cores.
3. Remove charging valve adapters (2) from charg-
ing valves.
4. Tighten swivel nut (small hex) on charging valve.
5. Install charging valve caps and protective covers
on both suspensions.
SUPPORT BLOCKS FOR OILING AND
CHARGING DIMENSIONS
Prior to starting oiling and charging procedures, sup-
ports should be fabricated which will maintain the
correct exposed piston rod extensions.
Exposed piston rod extensions are specified for both
oil level and nitrogen charging for HYDRAIR
®
II sus-
pensions. These dimensions are listed in the Tables
below Figures 4-2 and 4-4. Measure dimensions from
face of cylinder gland to machined surface on spindle
on front suspension. Measure from face of cylinder
gland to piston flange on rear suspension. Do NOT
include capscrew heads in measurements.
Support blocks may be made in various forms. Mild
steel materials are recommended. Square stock or
pipe segments [1 in. (25 mm) minimum] may be used.
Blocks must be capable of supporting the weight of the
truck during oiling and charging procedures while
avoiding contact with plated surfaces and seals on the
suspension. Refer to Figure 4-2 for front suspension
support block placement and Figure 4-4 for rear sup-
port block placement.
FRONT SUSPENSION
1. Park unloaded truck on a hard level surface. Block
wheels, apply parking brake.
2. Thoroughly clean area around charging valve on
the suspensions. Remove protective covers from
charging valves.
All HYDRAIR
®
II suspensions are charged with
compressed nitrogen gas with sufficient pressure
to cause injury or damage if improperly handled.
Follow all the safety notes, cautions and warnings
in these procedures to prevent accidents during
servicing and charging.
Front Suspension Oiling
When blocks are in place on a suspension, they
must be secured with a strap or other means to
insure the blocks stay in place while being used.
An unsecured block could fly loose as weight is
applied, presenting the possibility of serious in-
jury to nearby personnel and/or damage to the
equipment. Overhead clearance may be reduced
rapidly and suddenly when nitrogen pressure is
released!
1. Position and secure oiling height dimension
blocks in place (Figure 4-2). When nitrogen pres-
sure is released, suspensions will lower to rest on
the blocks. Take care that blocks do not mar or
scratch plated surface of the piston nor damage
the wiper seals in the lower bearing retainer.
Support blocks must seat on the spindle and the
cylinder housing. Place 2 blocks (180° apart) on
each side of suspension to provide stability.
Wear a face mask or goggles while relieving nitro-
gen pressure.
H4-2 Oiling and Charging Procedures H04005 9/99
730E, 830E, and 930E
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