CLUTCH ADJUSTMENT
The clutch serves to protect the door, the electric
operator and other equipment from undue stress
or damage caused by starting forces and/or an
obstruction to the door. It should be set no
tighter than is necessary to smoothly and
consistently move the door throughout its full
range of travel. When properly set, it will slip
freely if the door should encounter an
obstruction, and it should be possible to stop the
travel of the door by hand.
WARNING: Before adjustment remove
power to the operator.
1. Remove cotter pin from slotted hex nut and
clutch shaft.
2. Back off slotted hex nut until there is
insufficient tension on clutch spring to permit
clutch to drive door.
3. Tighten slotted hex nut gradually until there is
just enough tension on spring to permit operator
to move door smoothly, but to allow clutch to slip
if door is obstructed.
4. Be sure cotter pin is reinstalled each time
operator is tested for clutch adjustment and that
it is locked in place on completion of adjustment.
CAUTION NEVER COMPRESS CLUTCH
SPRING BEYOND POINT LIMITED BY THE
DESIGN OF THE OPERATOR OR REPLACE IT
WITH A HEAVIER SPRING.
Due to changing conditions of the door and
normal wear, it may be necessary to occasionally
readjust the clutch to obtain dependable
operation.
WARNING: BEFORE DOING SO BE CERTAIN
THAT THE DOOR IS IN GOOD WORKING
CONDITION, PROPERLY COUNTERBALANCED
AND THAT THE CLUTCH IS NOT SLIPPING
BECAUSE OF LOOSE OR MISSING HARDWARE,
BINDING IN THE TRACK, RUBBING AGAINST
THE DOOR STOPS OR DEFECTIVE OR
MISADJUSTED SPRINGS. ANY SERVICE
REQUIRED TO THE DOOR, DOOR SPRINGS OR
DOOR OPERATOR MUST BE PREFORMED BY A
QUALIFIED PROFESSIONAL DOOR INSTALLER.
The clutch pad will wear during normal operation
and should be replaced when it becomes difficult
or impossible to sufficiently tighten the clutch to
obtain smooth operation of the door when it is in
good working condition. To replace the clutch
pad, first loosen the motor mounting bolts and
remove the V-belt then the clutch adjusting nuts,
spring and clutch pulley. Check condition of V-
belt before reassembly and replace if required.
IMPROPER ADJUSTMENT OF CLUTCH
SETTING COULD CAUSE ENTRAPMENT,
INJURY OR DEATH. SET CLUTCH ADJUSTMENT
FOR JUST ENOUGH FORCE TO OPERATE THE
DOOR RELIABLY, BUT NO STRONGER. Contact
a service professional to correct any binding,
sticking or other door problems. DO NOT OVER-
ADJUST CLUTCH SETTING TO COMPENSATE
FOR A POORLY WORKING DOOR.
WARNING
RISK OF ENTRAPMENT THAT MAY RESULT
IN SERIOUS PERSONAL INJURY OR DEATH.
DISCONNECT POWER TO THE OPENER
BEFORE SERVICING OR MAKING
ADJUSTMENTS. ENSURE DOORWAY IS
CLEAR BEFORE STARTING TESTING OF
UNIT.
WARNING
ALWAYS DISCONNECT POWER TO
OPERATOR BEFORE SERVICING OR
MAKING ADJUSTMENTS.
CAUTION
OPERATION AND ADJUSTMENT INSTRUCTIONS
14
Figure 11
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