Adjust The Force - Craftsman 139.53960SRT Manual Del Propietário

ADJUSTMENT STEP 2
Adjust the Force
Force adjustment controls are located on the back
panel of the motor unit. Force adjustment settings
regulate the 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 maximum force adjustment range is about
3/4 of a complete turn. Do not force controls
beyond that 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 reversalsystem,
persons(particularly small children) could be
SERIOUSLY INJURED or KILLEDby a closing garage
door.
• Too much force on garagedoor will interfere with
properoperation of safety reversalsystem.
• NEVER increaseforce beyondminimum amount
requiredto close garagedoor.
• NEVER use force adjustmentsto compensatefor a
binding or sticking garagedoor.
• If one control (force or travel limits) is adjusted,the
othercontrol may also needadjustment.
• After anyadjustmentsare made,the safety reversal
systemMUSTbe tested. Door MUSTreverseon
contactwith one-inch high object (or 2x4 laid fiat) on
floor.
HOW AND WHEN TO ADJUST THE 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 one-inch
obstruction. See Adjustment Step 3, page 30.
If the door is hard to hold or doesn't reverse,
DECREASE the DOWN (close) force by turning
the control counterclockwise. Make smag
adjustments until the door reverses normally.
After each adjustment, run the opener through
a complete cycle.
• If the door reverses during the down (close)
cycle and 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. 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 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 open at least 5 feet,
INCREASE UP (Open) force by turning the
controlclockwise. Make small adjustments until
door opens completely.Readjust the UP limit if
necessary.After each adjustment, runthe
opener througha complete travel cycle.
Back panel
Force Adjustment Control
Adjustment Label
29