BENDIX DOUBLE ANCHOR PIN CAM BRAKE Manuel de description générale - Page 6
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FIGURE 8 - CHECKING SLACK ADJUSTER BACKLASH
6. SHOES AND LINING
A. Check shoes for bent shoe webs, cracks in shoe
table welds or webs, and elongated rivet holes.
Replace shoes if any of these conditions exist.
B. Measure the shoe span by loosely installing the
anchor pin and cam roller in the appropriate ends of
the shoe web. If the distance from center of anchor
pin to center of cam roller exceeds 11.72" replace
shoe.
C. Check linings. Replace when any of the following
conditions exist:
1. Lining thickness at thinnest point is 1/4" or less.
2. Linings are cracked or worn in an unusual or odd
pattern, i.e., lining wear tapered from side to side
across shoe table. Unusual wear patterns can
indicate damage to foundation brake parts.
3. Rivet holes are elongated in lining or shoes.
4. Lining is oil soaked.
5. Linings can be moved by hand, i.e.; loose rivets.
7. BRAKE DRUMS
A. Inspect drums for cracks, heat checking, glazing,
grooving, severe out-of-round condition or bell
mouthing (must not exceed .025 T.I.R.). Replace any
cracked drums. It is recommended that drums be
turned at reline to prevent hot spotting and achieve
quicker, more complete burnishing of the new lining.
B. Measure the drum I.D. to be sure the maximum limit
allowed (stamped on drum) has not been exceeded,
due to wear or machining.
8. MANUAL SLACK ADJUSTER
A. Check for cracks in the body and arm of the slack
adjuster.
B. Check for spline wear. The amount of backlash in
the slack adjuster to camshaft should be no more
than .094" measured 6" from centerline of the cam
shaft (See Figure 8).
C. Check ability to rotate the adjusting nut at least one
complete revolution in each direction. Force required
to rotate the adjusting nut should not exceed 15 ft.
lbs. NOTE: If any of the above conditions are found,
replace the slack adjuster. Do not attempt to repair.
6
.094"
6"
NOTE: BOTH LIP SEALS POINT THE SAME DIRECTION LIP
TOWARD SLACK ADJUSTER
LIP SEAL
SLACK ADJUSTER END
ACTUATOR BRACKET
AND CAM TUBE
FIGURE 9 - SEAL INSTALLATION
9. AUTOMATIC SLACK ADJUSTERS
A. Consult manufacturer's service information. (For
information on Bendix Automatic Slack Adjusters,
see Service Data Sheet SD-05-1200, formerly
SD-05-2).
10. ACTUATORS
A. Check for cracked housing, loose mounting studs.
B. Check for damage to the push rod, and push rod
boot (if so equipped).
C. Check for broken push rod return spring.
D. Check for excessive wear on yoke, yoke pin, and
slack adjuster yoke pin hole or bushing. There should
be no more than .031 combined free play in these
components.
CAUTION: If the vehicle is equipped with spring brakes,
refer to manufacturer's instructions. High spring load, if
not handled properly, may result in serious injury or death
may result.
ASSEMBLY (SEE FIGURE 2)
1. Install the spider onto the axle flange using the twelve
bolts, lockwashers and nuts. Be sure spider is properly
oriented, as noted during disassembly. Tighten mounting
bolts to vehicle manufacturer's specifications.
2. If anchor pin bushings or cam shaft bushings were
removed, replace with new bushings before installing
torque spider on axle. Drive into place using an
Owatonna 630-7 piloted driver or similar tool taking care
not to damage or distort the I.D. of the bushings. NOTE:
One of the cam shaft bushings is installed in the actuator
bracket and cam tube.
3. Install new cam shaft grease seals in the end of the cam
tube and actuator bracket and the cam shaft opening in
the spider. Use an Owatonna 630-7 piloted driver or similar
tool to install grease seals.
LIP SEAL
CAM END
SPIDER