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MAINTENANCE AND LUBRICATION
SLACK ADJUSTER
slack
5.
Fit the installation guide over the cam splines so the
1/2" pin slots face the air chamber.
6. Swing the guide into the clevis until the appropriate
slot totally engages 1/2" pin.
7. Observe the guide pointer arrow:
If the guide pointer is above the clevis pointer, adjust
clevis CCW for alignment.
If the guide pointer is below the clevis pointer, adjust
clevis CW for alignment.
8. Reposition clevis until the guide pointer aligns with
the clevis pointer.
9. Verify by engaging 1/4" pin through the clevis and
guide.
10. Tighten jam nut to 50 ft.-lbs. torque min.
11. Remove the guide from cam shaft.
12. If the push rod threads extend through the clevis
more than 1/16", remove clevis and cut rod to length.
13. If the push rod is not fully engaged in clevis body,
install a new push rod - cut to length.
14. Install the slack adjuster on the cam shaft.
15. Rotate the manual adjuster shaft CW until the slack
adjuster arm holes align with the clevis. Install 1/2"
and 1/4" pins and cotter pins.
4-24
PUSHROD
JAM NUT
CLEVIS
Figure 4-16: Slack Adjuster
Adjusting Slack Adjuster
1. Rotate the manual adjuster clockwise until brake
2. Back off manual adjuster 1/2 turn. (counterclockwise)
3. Manually uncage the spring brake.
4. Build up vehicle air pressure.
5. Fully apply and release the brakes several times to
6. Measure the distance from air chamber to 1/2" pin.
7. The stroke (difference of these two measurements)
COTTER PIN
1/2" CLEVIS PIN
COTTER PIN
1/4" CLEVIS PIN
INSTALLATION GUIDE
CAMSHAFT
ADJUSTMENT HEX
shoes contact drum.
check for adequate clearance to all adjacent
components.
Apply brakes with 100-105 psi air pressure and
remeasure distance to 1/2" pins.
must be less than 2 inches.
F-618-0911 Edition
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