Landoll 334C, Operator'S Manual

Page: 52 / 70

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.
c. Adjusting Slack Adjuster
1. Rotate the manual adjuster CW until brake
shoes contact drum.
2. Back off manual adjuster 1/2 turn. (CCW)
3. Manually uncage the spring brake.
4. Build up vehicle air pressure.
5. Fully apply and release the brakes several
times to check for adequate clearance to all
adjacent components.
6. Measure the distance (D) from air chamber
to 1/2" pin (See Figure 4-13) . Apply brakes
with 100-105 psi air pressure and
remeasure distance (D) to 1/2" pins (See
Figure 4-13) .
7. The stroke (difference of these two
measurements) must be less than 2 inches.
4-18
Figure 4-13 Slack Adjuster