BENDIX ASA-5 AUTOMATIC SLACK ADJUSTER Manuel d'utilisateur

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1
®
SD-05-1269
Bendix
®
ASA-5
Automatic Slack Adjuster
DESCRIPTION
The Bendix
®
ASA-5
sure stroke automatic slack adjuster
is designed for use on cam actuated drum brakes of the
type in use on most highway vehicles. Like a manual slack
adjuster, the ASA-5
slack adjuster multiplies and trans-
forms the linear force of the air actuator into a rotational
force or torque which is used to apply the foundation brake.
Additionally, the ASA-5
slack adjuster automatically
adjusts the clearance between the brake lining and drum to
compensate for wear.
A variety of ASA-5
slack adjuster configurations are offered
including both straight arm and 5/8" yoke offset models.
The ASA-5
slack adjuster is offered in arm lengths of 5,
5-1/2 and 6 inches and worm gear splines to accommodate
the standard 1-1/4" and 1-1/2" , SAE 10C as well as the
Rockwell 24 and 28 tooth and Propar 37 tooth splines.
Either of two yoke designs (easy-on and quick connect) in
combination with an external manual adjuster hex provides
convenient installation and maintenance of the ASA-5
slack
adjuster.
OPERATION
GENERAL
The automatic adjustment provided by the Bendix
®
ASA-5
slack adjuster results in consistent brake lining to drum
clearance and brake actuator stroke. The key to its opera-
tion is the ability to complete the brake adjustment during
the early part of each brake application and to cease ad-
justing as resistance to brake cam rotation begins to build.
This aspect of the adjuster mechanism’s operation prevents
over-adjustment due to: lining compression, actuator bracket
deflection, drum and foundation brake component distor-
tion, or brake component wear.
The ASA-5
slack adjuster incorporates a clutch-type
adjuster mechanism that continuously adjusts in very small
increments as lining and drum wear occurs. The adjust-
ments made by the ASA-5
slack adjuster are, therefore,
not in specific increments relative to actuator stroke.
APPLICATION
When the brakes are applied, the linear travel of the brake
actuators push rod causes the ASA-5
slack adjuster to
BOOT
LINK
LINK PIN
YOKE PIN
YOKE
WORM
GEAR
LUBE
FITTING
FIGURE 1 - ASA-5
AUTOMATIC SLACK ADJUSTER
rotate the foundation brake camshaft which in turn begins
to force the brake shoes into contact with the drum. When
the ASA-5
slack adjuster rotates, the yoke assembly piv-
ots on the yoke pin causing the link to be pulled upward.
The “teeth” on the link mesh with the adjuster mechanism
pinion and as the link is pulled it travels first through its free
play and then the pinion is rotated. Rotation of the pinion is
transmitted through the clutch spring to the worm and shaft.
Worm and shaft rotation results in worm gear rotation which
in turn adjusts (or repositions) the brake camshaft.
When the foundation brake shoes contact the drum, the
camshaft begins to resist rotation and friction between the
worm gear and worm builds, preventing further rotation of
the worm. Brake adjustment ceases at this point and fur-
ther rotation of the ASA-5
slack adjuster will cause the
pinion and clutch spring to slip. The “free play” between the
link teeth and pinion results in a predetermined lining to
drum clearance.
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Résumé du contenu

Page 1 - Automatic Slack Adjuster

1®SD-05-1269Bendix® ASA-5™ Automatic Slack AdjusterDESCRIPTIONThe Bendix® ASA-5™ sure stroke automatic slack adjusteris designed for use on cam actuat

Page 2 - YOKE DESIGNS

10ASA-5™ SLACK ADJUSTER TROUBLESHOOTING CHART (Continued)SYMPTOMSA. ASA-5™ slack adjusterimproperly installed. Tooclose to actuator: brakescan’t fully

Page 4 - INSTALLATION

12BW1602 © 2004 Bendix Commercial Vehicle Systems LLC. All rights reserved. 3/2004 Printed in U.S.A.

Page 5 - IN SERVICE INSPECTION

2ADAPTERBUSHINGYOKEYOKE PINLINK PINBOOTLUBERELIEFOPENINGCLUTCHSPRINGWORMANTI-REVERSESPRINGSPRINGRETAINERWORMGEARFIGURE 2 - SECTIONAL VIEW OF PROFILE A

Page 6 - BRAKE MAINTENANCE INSPECTION

3removed. Where circumstances require that theengine be in operation, EXTREME CAUTION shouldbe used to prevent personal injury resulting fromcontact w

Page 7 - DISASSEMBLY

4B. If the measurement is less than the minimum shownin Figure 5, the brake actuator push rod must beshortened. If the measurement is greater than the

Page 8 - ADJUSTER

55. Run the brake actuator push rod jam nut down againstthe adapter or adapter bushing. Hold the adapter oradapter bushing hex with a wrench and tight

Page 9

6the application and remain stationary during release. Nocounterclockwise rotation of the hex should be observed.The amount of clockwise rotation (adj

Page 10

7ASA-5™ SLACK ADJUSTER REMOVALNote: Make certain the vehicle has been prepared accord-ing to the instructions under the heading WARNING!PLEASE READ.1.

Page 11

83. Lubricate the automatic slack adjuster through the lubefitting with a quality multipurpose chassis lubricant(N.L.G.I. Grade 1 or 2). Lubricate the

Page 12

9A. Reposition components and torque tospecification.B. Replace damaged or worn parts.ASA-5™ SLACK ADJUSTER TROUBLESHOOTING CHARTSYMPTOMS1. Brake Actu

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