13
1. Remove cotter pin taped to pulley.
2. Rotate clutch nut counterclockwise (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 pemit 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.
CLUTCH PAD
CLUTCH PLATE
CLUTCH PULLEY
CLUTCH NUT
BRAKE ADJUSTMENT (For PRO-LTB only)
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. .
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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. Wben 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 bum 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 betv:een brake shoe pad and drum. After adjustments
are made be sure to tighten nuts on brake shoe adjustment bolts.
SOLENOID
SOLENOID LEVER
FRAME
BRAKE SHOE
ADJUSTMENT BOLTS
BRAKE SHOE
ADJUSTMENT NUT
BRAKE SPRING--4ij��
BOLT
BRAKE SPRING
BRAKE DRUM
._. _____ BRAKE SHOE
BRAKE PAD