BENDIX ASA-5 AUTOMATIC SLACK ADJUSTER Manual - Page 7
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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 wheels to keep vehicle from moving.
2. Raise axle so wheel can be rotated.
3. Adjust slack adjuster to produce light brake drag with
wheel rotation.
4. Apply brake to 80-90 psi and measure stroke (See Item
3 of In Service Inspection for pressure tips).
5. If 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"
Front
Brake
12 X 5.0"
1/2"
12 X 5.5"
1/2"
16 X 5.0"
5/8"
16 X 5.5"
3/4"
16 X 6.0"
7/8"
20 X 5.0"
5/8"
20 X 5.5"
3/4"
20 X 6.0"
7/8"
24 X 5.0"
N/A
24 X 5.5"
N/A
24 X 6.0"
N/A
30 X 5.0"
N/A
30 X 5.5"
N/A
30 X 6.0"
N/A
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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 approximately
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.
C. Rotate the manual adjustment hex counterclockwise
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until the ASA-5
actuator push rod.
16.5"x7"
16.5"x7"
Tractor, Truck
Trailer
or Bus Brake
Brake
N/A
N/A
N/A
N/A
1/2"
N/A
1/2"
N/A
5/8"
N/A
1/2"
3/8"
5/8"
1/2"
3/4"
5/8"
5/8"
1/2"
5/8"
5/8"
3/4"
5/8"
3/4"
5/8"
7/8"
3/4"
1"
7/8"
slack adjuster is clear of the brake
Note: Considerably more torque is required to rotate the
manual adjustment hex counterclockwise 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
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
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until the ASA-5
actuator push rod.
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3. Remove the ASA-5
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
before disassembly.
The following disassembly and assembly procedure is
presented for reference purposes and presupposes that a
rebuild or repair of the ASA-5
undertaken. Several replacement parts and maintenance
kits are available which do not require full disassembly. The
instructions 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 adjuster 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
permitted.
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slack adjuster's manual
slack adjuster is clear of the brake
slack adjuster from the camshaft
slack adjuster. Clean the exterior
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slack adjuster is being
™
slack adjuster is
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