Fabco SDA-2300, Service Manual

Page: 19 / 41

3. Push the air chamber mounting bracket onto the
S-camshaft. Then align the bracket on the
steering arm or upper kingpin cap. Insert the
two 7/8" bolts and torque to 250 lb.-ft.
4. Fit the air chamber mounting studs through their
holes in the bracket and secure with the two 5/8"
locknuts and washers. Torque to 150 lb.-ft. See
Figure 24
.
5. Install the inner washer and slack adjuster over
the S-camshaft with the 7/16" adjusting screw
pointing toward the front of the axle. Begin by
placing two .060" and two .030" spacers over
the end of the S-camshaft. Install the snap ring.
See
Figure 25
.
6. Tap on the cam end of the shaft with a soft mal-
let to move the shaft inboard. Attempt to insert a
.030" spacer between the existing spacers and
the snap ring.
If the spacer slides easily be-
tween the two, remove the snap ring and install
the spacer. Reinstall the snap ring and repeat
this step until a .030" spacer can no longer be in-
serted.
7. Thread the air chamber push rod into the clevis
until it bottoms out. Then back off two turns and
torque locknut to 75 lb.-ft.
8. Hook the two lower retaining springs into each
brake shoe. By grasping the shoes at the top
and spreading them apart, the circular recess in
the bottom of each shoe can be fit over the an-
choring pin on the spindle yoke. Install the large
upper brake release spring. Then using a bar,
pry the shoes away from the S-cam and insert
the camshaft rollers. See
Figure 26
.
CAUTION: DO NOT ALLOW YOUR FINGERS
TO COME BETWEEN THE SHOE
AND THE S-CAM!
9. Refer to Section 3.8 for brake adjustment.
6.4 WHEEL BEARINGS, HUB, AND
BRAKE DRUM
1. Press both wheel bearing cups into the hub.
Thoroughly pack both bearing cones with
grease, and coat the inside surfaces of the hub
and bearing cups. Install the inner wheel bear-
ing cone and the hub seal in the hub. See
Figure 27.
Lightly coat the outer surface of the
spindle with grease to reduce the chance of the
inner wheel bearing cocking upon installation of
the hub.
– 18 –
7/99
Figure #25
Figure #24
Figure #27
Figure #26