Instruction manual

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To test the photo system:
1. Open the door to full open position.
2. Close the door.
3. When door is closing, obstruct the beam. The door should stop and reverse.
1. Remove cotter pin tapped to pulley.
2. Rotate clutch nut CCW (loosen) until there is insufficient tension to permit clutch to drive door.
3. Gradually tighten clutch nut until the tension on belleville washers is sufficient to permit clutch to drive door smoothly
but will allow clutch to slip if door is obstructed. It should be possible to stop moving door by hand if clutch is properly
adjusted.
4. Lock clutch nut in place by inserting cotter pin.
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 de-
energized. 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.
CLUTCH ADJUSTMENT
BRAKE ADJUSTMENT (For model PRO-TB)