Maintenance Instructions
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1. Check the working stroke of the Elecro-Thrust actuator.
As linings wear, the brake lever arm will drop and the stroke must be periodically
reset before the actuator push rod bottoms out; otherwise, the brake will
slip. Wear is more rapid when the linings are new. Actuator push rod must
be maintained at dimension "B" (Ref. Diagram)
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1.1) If necessary, reset the stroke by adjusting nuts "C".
As the linings wear, nut "C" will have to be tightened to reset
the actuator stroke to dimension "B". Ensure that inner nut "C"
is locked on completion. Note: If a self-adjust mechanism is purchased the brake will automatically compensate as the lining wears. |
| 2. Check that the actuator fluid is correct. |
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2.1) Fill using the proper fluid. Actuator should be filled
to the lower edge of the inlet opening with the actuator vertical and in
the retracted position. After filling move the unit by hand to force any
trapped air to the top of the actuator. |
| 3. With brake set and actuator push rod at dimension "B", check for proper spring length location. Springs are preset at the factory but may require minor adjustment. |
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3.1) Reset if necessary, by means of adjusting bolt "F" |
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4. With the brake released, check for equal clearance between
the linings and brake drum. If necessary re-position the brake assembly. |
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4.1) Self-centering arms are interlocked. Arms should not bind
at pivot point. Unequal lining wear is an indication that the brake is not
centered. |
| Other points All pivot pins should be greased during scheduled maintenance. |
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Shoe Replacement Back off outer nuts "C", allowing the arms to move. Remove pins "A" and remove shoes. Fit new shoes and replace pins "A". Adjust nut "C" as noted above. |
Electro-Thrust Actuator Stroke Dimensions - For All Brake Sizes
