BRAKES
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
101
Figure 7 Adjuster Mechanism
If the adjuster arm engages and turns the star wheel,
continue. If the arm does not engage the star wheel, it
has been damaged and both wheel brake assemblies
must be replaced.
If the adjuster arm engages star wheel but does not
rotate it, the adjuster assemblies must be replaced with
new color-coded adjusters. Note the location of the two
Teflon coated washers (Figure 8).
7. Check the condition and operation of the moving
anchor assembly.
Operate the brake lever to check for free motion. The
adjuster assembly and brake lever must move
smoothly from front to back on the backing plate. If
the moving anchor assembly is damaged or jams
against the backing plate, replace both of the wheel
brake assemblies.
A backing plate assembly that shows any indi-
cation of galling or gouging is not repairable
and must be replaced with a new wheel brake
assembly. Always replace the wheel brake
assemblies in pairs.
8. Inspect the backing plate.
Inspect for gouges, galling or other damage, particu-
larly where the backing plate is contacted by the
brake shoes and by the moving anchor assembly.
Replace both backing plates if any gauges or galling
is found.
9. Measure the brake shoe thickness.
Measure the most worn area. The brake shoe thick-
ness must not be less than .060" (1.5 mm) at any
point on the shoe. It is normal for the shoes to show
more wear at the leading and trailing edges (Figure
8). If the brake shoe thickness is approaching. .060"
(1.5 mm), it is recommended that the shoes be
replaced. It is recommended that the brake shoe
springs and brake adjusters be replaced when
installing new brake shoes.
10. Inspect the brake shoe springs.
Make sure that they are not broken or damaged and
are correctly installed. The hooked end of the
adjuster spring is installed through the front of the
front shoe and the opposite end connected to the
adjuster with the hook end pointing out. The brake
shoe springs must be installed with the light spring
closest to the adjuster mechanism with the hook
installed down through the rear brake shoe and up
through the front brake shoe. The heavy top spring is
installed with both spring hooks installed down
through the brake shoes (Figure 9).
Figure 8 Brake Shoe Wear
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