Adjust The Force; How And When To Adjust The Forces - Craftsman 139.53976SRT 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 reversal system,
persons (particularly small children) could be
SERIOUSLYINJUREDor KILLEDby 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 one-inch high object (or 2x4 laid flat) 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 small
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 rome 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
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.
Back panel
Force Adjustment Control
Adjustment Label
29