The brake adjustment is factory set and should only require minor adjustment after extensive use. Verify brake adjustment by manually holding in solenoid plunger.
When brake is properly adjusted, the brake shoe pads should make complete contact with brake drum with sufficient brake spring tension to stop and maintain door when solenoid is de-energized. When solenoid is energized, brake shoes should release from drum with sufficient clearance to avoid contact between shoes and drum.
To adjust brake tension, tighten (to increase) or loosen (to decrease) nylon lock nut on brake spring bolt. Observe solenoid during electrical testing of brake.
Brake spring tension must be adjusted so that solenoid should pull and release smoothly and quietly.
Too much or too little tension on brake spring may cause solenoid to burn out. To adjust individual brake shoes, loosen nut on brake shoe adjustment bolt and adjust bolt. When properly adjusted, there should be a small clearance between adjustment bolt and solenoid bracket when solenoid is deenergized.
When solenoid is energized, brake shoes should move away from drum with sufficient clearance to avoid friction between brake shoe pad and drum.
After adjustments are made be sure to tighten nuts on brake shoe adjustment bolts.