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FRONT HYDRAIR/SPINDLE REMOVAL
The contact area of the front Hydrair suspension ta-
pered piston-to-spindle may become seized after a
long period of time. In order to remove the front spindle
from the tapered pistons for service work, it will be
necessary to apply force, and occasionally heat, to the
spindle to break it loose.
To remove the spindle from the tapered piston, a
pusher plate structure with capscrews and washers
should be used. This structure can be made locally
(Refer to Figure 8-3).
Refer to the appropriate truck shop/service manual
(Section "G") for "Spindle Removal" for all preliminary
and precautionary procedures.
Front Spindle Removal Using Pusher Structure
Heavy structures and high forces are involved in
this work. Use caution at all times in applying force
to these parts. Sudden release of the spindle could
cause parts to move forcefully and unexpectedly.
1. Remove the Hydrair retainer plate capscrews &
washers (1 & 2, Figure 8-1) and retainer plate (3)
from the underside of the spindle.
2. Carefully remove 15 of the 24 steering arm attach-
ment capscrews (4) as follows:
a. The 15 bolts should be removed from the "X"
hole positions (Figure 8-3).
Note the bolt pattern marked "X" on pusher
plate structure when removing the capscrews
from the spindle.
b. Capscrews may be seized in place. To mini-
mize possible damage to threads in spindle,
remove the capscrews in a circular pattern,
using at least 2 steps of lower torque after the
capscrews have started to move.
(This is the opposite procedure as used during
installation of the steering arm.)
Do Not remove capscrews in one sequence
with air wrench until they turn easily.
Threads may be damaged.
3. Run a tap of the correct size into the threaded
holes to insure good quality threads.
M08012 9/99
FIGURE 8-1. PISTON/SPINDLE/STEERING ARM
1. Capscrew
2. Washer
3. Retainer Plate
4. Capscrew
FIGURE 8-2. INSTALLING PUSHER STRUCTURE
1. Capscrew
2. Washer
3. Pusher Plate Structure 7. Tapered Piston
4. Not Used
4. Using several of the pusher capscrews (1, Figure
8-2) and hardened washers (2), put the pusher
structure (3) into position under the spindle (6).
NOTE: Multiple washers may be required to allow
the pusher capscrews to be effective. One (1) or
two (2) can be installed with the pusher structure
in place to gauge the washer height required (to
prevent the capscrews from bottoming-out).
The recommended minimum capscrew thread
engagement is 1.62 in. (41 mm).
Special Tools
5. Steering Arm
6. Spindle
7. Tapered Piston
5. Steering Arm
6. Spindle
M8-5
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