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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.
Rear support blocks for nitrogen charging are no
longer necessary. Rear suspensions still require
support blocks for oil charging.
Exposed piston rod extensions are specified for both
oil level and nitrogen charging for HYDRAIR
pensions. These dimensions are listed in the Tables
below Figures 4-2 and 4-4. Measure dimensions
from the face of the cylinder gland to the machined
surface on the spindle at the front suspension. Mea-
sure from the face of the cylinder gland to the piston
flange at the rear suspension.
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 proce-
dures 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 support block placement.
H04025
FRONT SUSPENSION
1. Park the unloaded truck on a hard, level sur-
face. Place the directional control lever in
PARK. Place chock in front and behind two sets
of wheels to prevent roll away.
2. Thoroughly clean area around the charging
valve on the suspensions. Remove the protec-
tive covers from the charging valves.
All HYDRAIR
compressed nitrogen gas with sufficient pres-
sure to cause injury and/or damage if improperly
handled. Follow all the safety notes, cautions and
®
II sus-
warnings in these procedures to prevent acci-
dents 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
avoid accidental discharge. An unsecured block
could fly loose as weight is applied, presenting
the possibility of serious injury to nearby person-
nel and/or damage to the equipment. Overhead
clearance may be reduced rapidly and suddenly
when nitrogen pressure is released!
NOTE: For longer life of suspension components, a
Friction Modifier should be added to the suspension
oil. See Specifications Chart, Figure 4-5 at the end of
this chapter.
Oiling and Charging Procedures
®
II suspensions are charged with
H4-5
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