Craftsman 139.53915D Manual Del Propietário página 28

ADJUSTMENT STEP 2
Adjustthe Force
Force adjustment controls are located on the right panel of the
motor unit. Force adjustment settings regulatethe amount of
power required to open and close the door.
If the forces are set too light, door travel may be interrupted by
nuisance reversals in the down direction and stops in the up
direction. Weather conditions can affect the door movement, so
occasional adjustment may be needed.
The maximumforce adjustmentrange is about3/4 of a
completeturn. Do not force controlsbeyondthat point. Turn
force adjustment controls with a screwdriver.
NOTE:If anything interferes with the door's upward travel it
will stop. If anything interferes with the door's downward travel
(including binding or unbalanced doors), it will reverse.
Without a properly installed safety reversal system, persons
(particularly small children) could be SERIOUSLYINJUREDor
KILLED by a closing garage door.
• Too much force on garage door will interfere with proper
operation of safety reversal system.
• NEVERincrease force beyond minimum amount required to
close garage door.
• NEVERuse force adjustments to compensate for a binding or
sticking garage door.
• If one control (force or travel limits) is adjusted, the other
control may also need adjustment.
• After ANY adjustments are made, the safety reversal system
MUST be tested. Door MUST reverse on contact with 1-1/2"
high (3.8 cm) object (or 2x4 laid flat) on floor.
HOWAND WHENTO ADJUSTTHE FORCES
1. Test the DOWN (close) 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 1-1/2" (3.8 cm) obstruction. SeeAdjustment
Step 3, page 29. If the door is hardto hold or doesn't
reverse, DECREASE the DOWN(close) force by turning
the control counterclockwise. Make small adjustments until
the door reverses normally. After each adjustment, run the
opener through a complete cycle.
• If the door reverses duringthe down(close) cycleand the
opener lights aren't flashing, INCREASE DOWN(close) force
by turning the control clockwise. Make small 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 close the
door.
2. Testthe 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
hardto hold or doesn't stop, DECREASE UP (open) force by
turning the control counterclockwise.Make small adjustments
until the door stops easily and opens fully. After each
adjustment, run the opener through a complete travel cycle.
• If the door doesn't openat least 5 feet (1.5 m),
INCREASEUP (open) force by turning the control clockwise.
Make small adjustments until door opens completely.
Readjust the UP limit if necessary.After each adjustment, run
the opener through a complete travel cycle.
Force Adjustment
Controls
Right Panel
° °
@"_ Antenna
ADJUSTMENT LABEL
Open Force Close Force
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