BENDIX ASA-5 AUTOMATIC SLACK ADJUSTER Manuel - Page 2
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ADAPTER
BUSHING
CLUTCH
SPRING
WORM
ANTI-
REVERSE
SPRING
SPRING
RETAINER
WORM
GEAR
FIGURE 2 - SECTIONAL VIEW OF PROFILE AND END
the worm. Brake adjustment ceases at this point and further
™
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.
BRAKE RELEASE
When the brake application is released, the brake actuator
push rod returns the ASA-5
position. During release, the ASA-5
back toward the actuator causing the brake camshaft to
again rotate, but in the opposite direction, and the brake
shoes begin to move away from the drum. As the ASA-5
slack adjuster rotates back to the release position the yoke
again pivots causing the link to be pushed downward into
the slack adjuster body. The "free play" between the link
teeth and pinion is taken up during the initial part of the
release. Continued movement of the ASA-5
toward the released position causes the link to rotate the
pinion. The anti-reverse spring prevents counterclockwise
rotation of the shaft and worm causing the pinion and clutch
spring to slip. The gripping action of the anti-reverse spring
2
YOKE
YOKE PIN
™
slack adjuster to the released
™
slack adjuster rotates
™
slack adjuster
LINK PIN
BOOT
LUBE
RELIEF
OPENING
FREE
PLAY
MANUAL
ADJUSTER
HEX
LUBE
FITTING
and slippage of the clutch spring during release is due to
the direction of the coil windings of each.
YOKE DESIGNS
ASA-5
™
slack adjusters may be equipped with either of two
yoke designs. Both are designed to permit installation or
removal of the slack adjuster along with its yoke body and
its attached adjusting linkage.
The brake actuator push rod must thread into the adapter a
minimum of 1/2 inch and must not extend more than 7/64
inch beyond the other end of the adapter. The yoke adapters
(quick connect & easy-on) have either a 1 or 1-1/4 inch hex to
™
allow tightening of the brake actuator push rod jam nut.
EASY-ON YOKE (REFER TO FIGURE 3)
The easy-on yoke assembly consists of an adapter which
is threaded internally to match the push rod threads and
externally to match female threads in the yoke. A special
extended yoke adapter is also available as a separate service
item. The extended adapter is 1/2 inch longer than the
standard and is primarily intended for use when the existing
brake actuator push rod is too short.
PINION