6.4: Actuator Stroke Adjustment
6.4.(a): When power is applied to the actuator the piston will be caused to extend. This will compress the external spring and raise the brake lever to provide operating clearance between the shoes and the wheel.
6.4.(b): When power is removed from the actuator, the spring will retract the lever until the shoe pressure on the wheel prevents any further lever movement as the reserve stroke setting is attained and the intended brake torque achieved.
6.4.(c): Brakes without Automatic Adjustment:6.4.(d): Adjust the brake rod nuts until the brake release lever raises the piston rod to the specified reserve stroke, (Table 2).
6.4.(f): To make initial adjustment before engaging the auto adjust (AA), refer to Fig. 2A and withdraw pin (E). Rotate the mechanism by hand to decrease the brake rod length until the linings contact the wheel and the brake lever begins to rise. Continue adjustment until the required reserve stroke is about 1/8” less than specified.
6.4.(g): Energize the actuator several times until the rotating collar (R) is no longer turned by the
(AA)drive pin (E). Verify that the reserve stroke is still at the desired value per Table 2.
Table 2
ACTUATOR | MAX | ACTIVE | DESIRED |
STROKE | STROKE | RESERVE | |
| (inches) | (inches) | STROKE (inches) |
Ed23/5 | 1.97 | 1.27 | 0.7 |
|
|
|
|
Ed30/5 | 1.97 | 1.27 | 0.7 |
|
|
|
|
Ed50/6 | 2.36 | 1.56 | 0.8 |
|
|
|
|
Ed80/6 | 2.36 | 1.56 | 0.8 |
|
|
|
|
Ed121/6 | 2.36 | 1.56 | 0.8 |
|
|
|
|
6.5: Torque Adjustment
6.5.(a): The rated torque, as shown on the nameplate, will be developed when the following conditions are met:
6.5.(a).(i): The brake is applied and aligned properly.
6.5.(a).(ii): The actuator stroke is correct.
8/17/2006 | Page 17 of 33 | MST/E Electric Shoe Brakes Manual |
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