Bendix Commercial Vehicle Systems ASA-5 AUTOMATIC SLACK ADJUSTER 2/11 - Manual (Page 7)

7
C. Rotate the manual adjustment hex counterclockwise
until the ASA‑5 ® slack adjuster is clear of the brake
actuator push rod.
Note: Considerably more torque is required to rotate the
manual adjustment hex counterclock wise than is necessary
to rotate it clockwise. The torque may be as high as 70
foot pounds.
2. If the ASA‑5
® slack adjuster is equipped with the
quick‑connect yoke assembly illustrated in Figure 4:
A. Rotate the ASA‑5
® slack adjuster's manual
adjustment hex counterclockwise until the brake
actuator push rod just begins to move out of the
actuator.
B. Pinch the legs of the retaining ring together and
pull the ASA‑5 ® slack adjuster away from the brake
actuator push rod until the adapter bushing is free
of the yoke. Remove the retaining ring from the
adapter bushing.
C. Rotate the manual adjustment hex counterclockwise
until the ASA‑5 ® slack adjuster is clear of the brake
actuator push rod.
3. Remove the ASA‑5 ® slack adjuster from the camshaft
of the foundation brake by removing the retaining clip
and any spacers or washers that may be present.
DISASSEMBLY
GENERAL
A reasonable level of cleanliness should be observed when
working on the ASA‑5 ® slack adjuster. Clean the exterior
before disassembly.
The following disassembly and assembly procedure is
presented for reference purposes and presupposes that
a rebuild or repair of the ASA‑5 ® slack adjuster is being
undertaken. Several replacement parts and maintenance
kits are available which do not require full disassembly. The
in structions provided with these parts and kits should be
followed in lieu of the instructions presented here.
1. Clamp the ASA‑5
® slack adjuster ARM in a bench
vise. Do not clamp across the portion of the body that
contains the adjuster assembly or worm gear. Using a
wire brush, thoroughly clean the exterior of the slack
ad juster paying particular attention to the area around
the manual adjustment hex and its retaining ring. Wipe
all loose contaminants away before proceeding.
2. Remove the cotter pins and washers from the yoke pin
and link pin.
3. Remove the yoke pin and link pin and separate the
yoke from the ASA‑5 ® slack adjuster.
4. If the ASA‑5 ® slack adjuster has a yoke pin bushing,
press it out of the slack adjuster arm.
5. No further disassembly of the ASA‑5 ® slack adjuster is
permitted.
and COMPLETE RELEASES (the number of applications
depends on how much the slack was de‑adjusted).
BRAKE MAINTENANCE INSPECTION
Note: Make certain the vehicle has been prepared
according to the instructions under the heading GENERAL
SAFETY GUIDELINES.
The following test can be used to inspect the maintenance
condition of the foundation brake and to determine how
much of the chamber stroke is caused by the condition of
the foundation brake.
1. Always chock the wheels to keep vehicle from
moving.
2. Raise the axle so the wheel can be rotated.
3. Adjust the slack adjuster to produce light brake drag
with wheel rotation.
4. Apply the brake to 80‑90 psi and measure the stroke
(See Item 3 of In Service Inspection for pressure
tips).
5. If the stroke significantly exceeds the values shown in
the chart, the brake may be out of the norm and brake
maintenance may be required.
AL Factor 15"x4" 16.5"x7" 16.5"x7"
Front Tractor, Truck Trailer
Brake or Bus Brake Brake
12 X 5.0" 1/2" N/A N/A
12 X 5.5" 1/2" N/A N/A
16 X 5.0" 5/8" 1/2" N/A
16 X 5.5" 3/4" 1/2" N/A
16 X 6.0" 7/8" 5/8" N/A
20 X 5.0" 5/8" 1/2" 3/8"
20 X 5.5" 3/4" 5/8" 1/2"
20 X 6.0" 7/8" 3/4" 5/8"
24 X 5.0" N/A 5/8" 1/2"
24 X 5.5" N/A 5/8" 5/8"
24 X 6.0" N/A 3/4" 5/8"
30 X 5.0" N/A 3/4" 5/8"
30 X 5.5" N/A 7/8" 3/4"
30 X 6.0" N/A 1" 7/8"
ASA-5 ® SLACK ADJUSTER REMOVAL
Note: Make certain the vehicle has been prepared
according to the instructions under the heading GENERAL
SAFETY GUIDELINES.
1. If the ASA‑5
® slack adjuster is equipped with the
easy‑on yoke assembly illustrated in Figure 3:
A. Loosen the brake actuator push rod jam nut
and run it back on the brake actuator push rod
ap proximately 5/8 inch.
B. Loosen the easy‑on yoke adapter and run it back
on the brake actuator push rod until it is free of the
yoke.