Bendix Commercial Vehicle Systems ASA-5 AUTOMATIC SLACK ADJUSTER 2/11 - Manual (Page 4)

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FIGURE 6 - INSTALLATION ANGLE
INITIAL INSTALLATION PREPARATION
1. If necessary, carefully remove the manual or automatic
slack adjuster currently installed, including the brake
chamber yoke assembly.
2. Before mounting the ASA‑5 ® slack adjuster on the
camshaft, check the brake chamber push rod length
to determine whether shortening or replacement is
required. To accomplish this:
A. With the brake chamber in the released position,
place a square (or equivalent object) so that one
edge is parallel to the actuator push rod while the
other edge bisects the brake camshaft. Measure
the distance from the push rod end to the vertical
edge of the square and compare it to the values in
Figure 5.
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 (5/8"‑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. Note: Installing any other type of
push rod extender is not recommended, because
these devices may loosen over time and result in
an improperly adjusted brake.
3. Inspect the foundation brake, brake chamber and related
components. Make certain the camshaft bushings and
seals are not excessively worn. Lubricate the camshaft
bushings. Check the brake chamber bracket for cracks
and excessive corro sion. 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
ap proximately 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:
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
ac tuator push rod. Thread the quick connect adapter
bushing on the brake actuator push rod until it is flush
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
Slack Adjuster
Arm Length Angle
5" 99°‑113°
5.5" 98°‑111°
6" 90°‑109°