13.21.3 Replacing the brake shoes
Remove the wheel hub/drum following the method outlined
in paragraph 13.19 for greasing the bearings.
The brake shoes can now be removed from the axle.
When replacing the brake shoes, check all the brake
components.
Condition of the drums.
Condition of the cam shafts and levers, in particular
Check the clearance in the splines.
Wear on the bushings.
Condition of the shoe return springs.
Condition of the fulcrums and their mountings
(depending on the model).
Check the rotation of the brake shoe rollers (if fitted)
and lightly lubricateuising graphite grease before
reassembly.
Always replace any worn or damaged parts.
Transfer the return springs to the new brake shoes and fit
the new shoes to the axle.
When reassembling, apply a thin coat of graphite grease to
all contact surfaces (cams, fulcrums, bushings, etc) being
careful to avoid getting any grease on the drums and shoe
linings. During these operations it is advisable to wear
new, uncontaminated gloves.
For brakes equipped with an adjustable fulcrum pin, it will
be necessary to centre the brake shoes before locking the
nut of the pin.
When the hub/brake assembly has been reassembled,
slacken the fulcrum nut slightly, operate the brake lever in
the correct direction (direction of the actuator thrust) by
pulling on the lever by hand. (it is easier if a pipe is placed
over the lever as shown in figure 16) to press the shoes
against the drum.
At this point tighten the nut of the fulcrum pin, while
pressing on the lever.
Figure 16. Fulcrum adjustment.
Finally, insert the elastic pin that prevents the nut from
coming loose.
13.22 Service Brake Adjustment
It is imperative that the brakes are adjusted correctly to
meet the requirements of the braking regulations. As the
brake shoes wear, it will be necessary to realign the brake
levers on their splines so that the actuators extend as little
as possible to apply the brakes. This will make sure the
brakes are applied efficiently.
Figure 17. Brake adjustment.
The adjustment must be made when an angle less than
80° between the lever and the line of action of the actuator
occurs or when the actuator extends more than 50mm
when the brakes are applied.
13.22.1 Adjusting Brake Levers - Fixed Levers
Figure 18. Brake adjustment fixed levers.
1 Slacken bolts
2 Remove lever
3 Rotate Arm
4 Replace lever
28
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