4
B. If the measurement is less than the minimum shown
in Figure 5, the brake actuator push rod must be
shortened. If the measurement is greater than the
maximum values, the brake actuator push rod may
require replacement. The extended adapter, available
as a separate service part (5/18-18 pc. no. 297700
and 1/2-20 pc. no. 297701) may avoid the need to
replace the brake actuator push rod. The extended
adapter is available for the easy-on yoke assembly
only.
3. Inspect the foundation brake, brake chamber and re-
lated components. Make certain the camshaft bushings
and seals are not excessively worn. Lubricate the cam-
shaft bushings. Check the brake chamber bracket for
cracks and excessive corrosion. The brake actuator push
rod should not be loose or bent and the return spring
should be firm. Replace parts that are suspect.
4. Wire brush the foundation brake camshaft to loosen
contamination and wipe clean. Depending on
environmental conditions, an application of anti-seize
compound to both the camshaft and worm gear spline
may facilitate later slack removal.
INSTALLATION
1. Select the proper ASA-5
™
slack adjuster.
2. Install the ASA-5
™
slack adjuster on the brake camshaft.
3. If the ASA-5
™
slack adjuster has the easy-on yoke (see
Figure 3), position the brake actuator push rod jam nut
approximately 1-5/16 inches from the end of the brake
actuator push rod. Thread the easy-on yoke adapter on
the brake actuator push rod until it is approximately 3/8
inch from the end of the brake actuator push rod end.
Turn the ASA-5
™
slack adjuster manual adjustment hex
clockwise until the adapter extends into the threaded
bore of the yoke approximately 1/8 inch. Thread the
adapter into the yoke and tighten to 10 foot pounds.
The installation angle of a properly installed ASA-5
™
slack
adjuster:
Slack Adjuster
Arm Length Angle
5" 99°-113°
5.5" 98°-111°
6" 90°-109°
SLACK "A" STD. "A"
ADJUSTER QUICK CONNECT EXTENDED
ARM OR EASY-ON EASY-ON
LENGTH ADAPTER ADAPTER
5" 1-15/16" - 3-1/32" 2-7/16" - 3-17/32"
5-1/2" 1-15/16" - 3-3/16" 2-7/16" - 3 11/16"
6" 1-3/16" - 3-3/16" 1-11/16" - 3-11/16"
MOUNTING
STUD
SQUARE
DISTANCE
"A"
FIGURE 5 - MEASURING THE BRAKE ACTUATOR PUSH
ROD
BRAKE ACTUATOR
PUSH ROD
INSTALLATION ANGLE
4. If the ASA-5
™
slack adjuster has the quick connect yoke
(see Figure 4), position the brake actuator push rod jam
nut approximately 1 inch from the end of the brake
actuator push rod. Thread the quick connect adapter
bushing on the brake actuator push rod until it is flush
with the end of the brake actuator push rod. Install the
retaining ring on the adapter bushing, making certain it
is in the adapter bushing groove. Turn the ASA-5
™
slack
adjuster manual adjustment hex clockwise until the
adapter bushing begins to enter the yoke. Fully com-
press the retaining ring “legs” and continue turning the
ASA-5
™
slack adjuster manual adjustment hex until the
adapter bushing is completely in the yoke.
Allow the retaining ring to expand into the corresponding
groove in the yoke. Make certain the retaining ring is
seated in both the yoke and the adapter bushing groove
by manually pulling the ASA-5
™
slack adjuster arm,
attempting to separate the adapter bushing and yoke.
(56 pages)
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