Craftsman 1/2HP Garage Door Opener 139.53515SR - Manual (Page 17)

Adjustment
STEP 1
Adjust UP and DOWN Limits
LIMIT ADJUSTMENT settings (left side panel) regulate the
points at which the door will stop when moving up or down,
NOTE: Door STOPS in the UP direction if anything
interferes with door travel. Door REVERSES in the
DOWN direction if anything interferes with the door
travel (including binding or unbalanced doors).
PROCEDURE: Press Wall Control push button or trans­
mitter. Run opener through a COMPLETE TRAVEL
CYCLE. Limit adjustments are not necessary when the
door opens arid closes completely and doesn’t reverse
unintentionally in the down position.
Limit Adjustment
Screws
MCAEASe I^EASE
DOWM Ur
THAVeL TRAVEL
Adjustment Label
The following chart outlines adjustment procedures. Run the opener through a COMPLETE TRAVEL CYCLE AFTER
EACH ADJUSTMENT. NOTE; REPEATED OPERATION OF THE OPENER DURING ADJUSTMENT PROCEDURES MAY
CAUSE MOTOR TO OVERHEAT AND SHUT OFF, SIMPLY WAIT IS MINUTES AND TRY AGAIN. Read chart carefully
before proceeding to Step 2. Use a screwdriver to make limit adjustments.
LIMIT ADJUSTMENT CHART
IF DOOR DOES NOT OPEN COMPLETELY
BUT OPENS AT LEAST FIVE FEET
Increase UP travel. Turn the UP LIMIT adjustment screw
clockwise. One turn equals 2" of travel.
If door does not open at least 5 feet: Adjust OPEN
FORCE as explained in Step 2.
IF DOOR DOES NOT CLOSE COMPLETELY
Increase DOWN travel. Turn down limit adjustment screw
counterclockwise. One turn equals 2" of travel.
If the door still will not close completely, the header bracket
is positioned too high. Repeat Step 1, page 10.
IF DOOR REVERSES WHEN CLOSING AND THERE
IS NO INTERFERENCE TO TRAVEL CYCLE
Test door for binding; Pull emergency release handle.
Manually open and close door. If door is binding, call a
door serviceman. If door is not binding or unbalanced,
adjust CLOSE FORCE. See Step 2.
IF OPENER REVERSES IN FULLY CLOSED POSITION
Decrease DOWN travel. Turn down limit adjustment screw
clockwise. One turn equals 2* of travel.
STEP 2
Adjust Force
A
DO NOT USE FORCE ADJUSTMENTS TO COMPENSATE FOR A BINDING OR STICKING GARAGE DOOR.
EXCESSIVE FORCE. WILL INTERFERE WITH PROPER OPERATION OF SAFETY REVERSE SYSTEM OR
DAMAGE GARAGE DOOR.
Force Adjustment Controls are located on right side panel
of opener. FORCE ADJUSTMENT settings regulate
amount of the power required to open and close door.
NOTE: The door STOPS in the UP direction if anything
interferes with its travel. Door REVERSES in the DOWN
direction if anything interferes with its travel (including
binding or unbalanced doors).
If the force adjustments are set too light, door travel may be
interrupted by nuisance reversals in DOWN direction and
stops in UP direction. Weather conditions can affect the
door movement so occasional adjustment may be needed.
Maximum force adjustment range is 260 degrees, about
3/4 of a complete turn. Do not force controls beyond that
point. Turn force adjustment controls with a screwdriver.
Force Adjustment
Controls A UU1IL1V<9 \//o
Right Side Panel Adjustment Label
FORCE ADJUSTMENT CHART
TEST DOWN (CLOSE) FORCE
Grasp the door handle or door bottom when door is about
halfway through DOWN (CLOSE) TRAVEL. Door should
reverse. If the door is hard to hold or doesn’t reverse,
decrease DOWN (CLOSE) FORCE by turning the control
in a counterclociwise direction. Make 10 degree turn
adjustments until door reverses normally. After each
adjustment, run opener through a complete cycle.
PROCEED TO STEP 3
IF DOOR DOESN’T OPEN AT-LEAST 5 FEET
Increase UP (OPEN) FORCE by turning control clockwise.
Make 10 degree turn adjustments until door opens
completely. Readjust UP LIMIT if necessary. After each
adjustment, run opener through a complete travel cycle.
IF DOOR REVERSES DURING DOWN (CLOSE) CYCLE
Increase DOWN (CLOSE) FORCE by turning the control
clockwise. Make 10 degree turn adjustments until door
completes close cycle. After each adjustment, run the
opener through a complete travel cycle.
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