Brake Adjustment; Clutch Adjustment And Auxiliary Reversal System - Chamberlain J Owner's Manual

BRAKE ADJUSTMENT

WARNING
A solenoid is standard on 3/4 and 1 horsepower models, and is
optional on 1/3 and 1/2 horsepower models. The brake is
adjusted at the factory and should not need additional adjustment
CAUTION
for the the life of the friction pad.
Replace friction pads when necessary. Refer to the illustration for
identification of components for the solenoid type brake system.
CLUTCH ADJUSTMENT AND
AUXILIARY REVERSAL SYSTEM
The Auxiliary Reversal System is designed to protect the door
and motorized operator. It is NOT a substitute for a safety sensing
device, nor will it work for sectional doors when a jackshaft
operator is used. The Auxiliary Reversal System works in tandem
with the adjustable clutch to detect if a closing door runs into or
comes across an obstruction. If an obstruction is met and causes
the clutch to slip, the Auxiliary Reversal System will return the
door to the full open position.
1. Remove cotterpin from nut on the clutch shaft.
2. Back off clutch nut until there is very little tension on the
clutch spring.
3. Tighten clutch nut gradually until there is just enough tension
to permit the operator to move the door smoothly but to allow
the clutch to slip if the door is obstructed. When the clutch is
properly adjusted, it should generally be possible to stop the
door by hand during travel.
4. Reinstall cotterpin.
A D J U S T M E N T
To avoid SERIOUS PERSONAL INJURY or DEATH from
electrocution, disconnect electric power to operator before
adjusting slip clutch.
Solenoid
To prevent possible SERIOUS INJURY or DEATH, install
reversing sensors when the 3-button control station is out of
sight of the door or any other control (automatic or manual) is
used. Reversing devices are recommended for ALL installations.
Cotterpin
9
WARNING
WARNING
Cotterpin
Release Lever
WARNING
CAUTION
Clutch Pad
Adjusting Nut
Spring
Washer
Clutch Pulley
Friction Pads
Plate Assembly
Clutch Plate