Craftsman 1/2 HP GARAGE DOOR OPENER 139.53978SRT - Manual (Page 29)

Adjustment Step
2
Adjust the Force
Force adjustment controls are located on the back
panel of the opener. Force adjustment settings
regulate the amount of power required to open and
close the door.
The door will stop in the up direction if anything
interferes with its travel. The door will reverse in the
down direction if anything interferes with its travel
(including binding or unbalanced doors).
If the forces are set too light, door travel may be
interrupted by
nuisance reversals
in the
down
direction and stops \n the ¿/p direction.
Weather conditions can affect the door
movement, so occasionai adjustment may be
needed.
The 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.
Too much force on the door will interfere with
the proper operation of the safety reverse
system. The door might not reverse property
when required and could seriously injure or kill
someone under it. Do not increase the force
beyond the minimum amount required to ciose
the door. Do not use the force adjustments to
compensate for a binding or sticking garage
door. Test the safety reverse system foilowing
ali adjustments to force ieveis. See page 30.
Back panel of
door opener
Force
Adjustment
Control
Adjustment Label
How and When to Adjust the Forces
Test the DOWN (ciose) force
Grasp the door bottom when the door is about
halfway through DOWN (close) travel. The door
should reverse.
Reversal halfway through down
travel does not guarantee reversal on a two-inch
obstruction. Seepage 30.
If the door is hard to
hold or doesn't reverse, decrease the DOWN (close)
force by turning the control counterclockwise.
Make 10 degree turn adjustments until the door
reverses normally. After each adjustment, run the
opener through a complete cycle.
Test the UP (open) force
Grasp the door bottom when the door is about
halfway through UP (open) travel. The door should
stop. If the door is hard to hold or doesn't stop,
decrease UP (open) force by turning the control
counterclockwise.
Make 10 degree turn adjustments until the door stops
easily. After each adjustment, run the opener through
a complete travel cycle.
If the door doesn't open at leasts feet
Increase UP (Open) force by turning the control
clockwise. Make 10 degree turn adjustments until
door opens completely. Re-adjust the UP limit if
necessary. After each adjustment, run the opener
through a complete travel cycle.
If the door /jeve/sesduring the down (close) cycie
and the opener iights aren't flashing
Increase DOWN (close) force by turning the control
clockwise. Make 10 degree turn adjustments until the
door completes a close cycle. After each adjustment,
run the opener through a complete travel cycle.
Do
not increase the force beyond the minimum
amount required to ciose the door.
29