To move the shoes away from the drum, rotate the tool handle up while keeping the
adjuster spring pushed away from the star wheel.
Do not allow linings to drag on drum or they will heat up and lock.
The linings will be charred and rendered useless, resulting in brake failure.
4. Adjust the linings until a slight resistance can be felt when the brake drum is
rotated. Then adjust in the other direction until the drum can just rotate freely.
1.5.4 Rear Drum Brake Assembly and Installation
See parts illustration in chapter 4.
1. Before assembly, apply a thin layer of brake lubricant (or NLGI No. 2 grease) to
the following parts:
a. Ends of cylinder push rods (item 21).
b. Adjusting bolt (item 14) threads and on ends (item 13 and 15) where they
contact shoes.
c. All shoe sliding surfaces.
d. Anchor pins (item 8), anchor pin holes, and anchor pin slots.
2. Position wheel cylinder, install capscrews and lock washers, and tighten to 15-20
ft-lbs torque.
3. Install the two anchor pins in the holes in the backing plate.
4. Put the trailing shoe in position into the anchor pin slot and engage it with the
wheel cylinder push rod.
5. Install the two trailing shoe hold-down pins through the backing plate.
6. To install the two hold-down clips, engage the clip on the pin and rotate the clip
down until it sets flat on the shoe.
7. Install the stamped adjusting spring lever (item 16) on the leading shoe.
8. Position leading shoe in anchor pin slot and position adjusting bolt assembly
(items 13, 14, & 15) between shoes. At the same time, install the lower spring.
9. Hold the leading shoe in correct position and install the hold-down pin and clip.
10. Install the two upper springs. Place the green spring on the leading shoe for the
right-hand brake and on the trailing shoe for the left-hand brake.
11. Install the short automatic adjustment wire (item 19) to connect the pivot to the
pin near the anchor location.
12. Install the long automatic adjustment wire (item 17) to connect the pivot (item 18)
to the stamped automatic adjustment spring.
AUGUST 31, 2008 CHAPTER 3 OVERHAUL
PAGE 8 1 GENERAL REPAIR
M100 Tow Tractor Manual No. 46052
To Next Page
Loading...
