Bendix Commercial Vehicle Systems VERSAJUST AUTOMATIC SLACK ADJUSTER - Manual (Page 3)

3
A. With the brake chamber in the released position,
place a square (or an 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 4.
Slack Adjuster
Arm Length
"A" Std.
Quick Connect or
Easy-On Adapter
"A" Extended
Easy-On 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"
BRAKE ACTUATOR
PUSH ROD
FIGURE 4 - MEASURING THE BRAKE ACTUATOR PUSH
ROD
B. If the measurement is less than the minimum shown
in Figure 4, 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.
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 corrosion. 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
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.
YOKE
3 /
8
" OUT
JAM NUT
MOUNTING
STUD
ADAPTER
1 5 /
16
"
PUSH ROD
FIGURE 2 - EASY-ON YOKE ASSEMBLY
QUICK-CONNECT YOKE
The adapter bushing in this case is threaded internally to
match the push rod, but is designed to slide into the yoke.
A retainer ring is used to secure the adapter bushing in the
yoke. (Refer to Figure 3.)
YOKE
FLUSH
JAM NUT
MOUNTING
STUD
ADAPTER
BUSHING
PUSH ROD
1"
RETAINING RING
FIGURE 3 - QUICK-CONNECT YOKE ASSEMBLY
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 Bendix ® Versajust ™ slack adjuster
on the camshaft, check the brake chamber push rod
length to determine whether shortening or replacement
is required. To accomplish this: