Adjust The Force - Craftsman 139.18489DS Owner's Manual

ADJUSTMENT STEP 2

Adjust the Force

Force adjustment controls are located on the right 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.
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 1-1/2" (3.8 cm) obstruction. See Adjustment
Step 3, page 29. 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 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 (1.5 m),
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.
Without a properly installed safety reversal system, persons
(particularly small children) could be SERIOUSLY INJURED or
KILLED by a closing garage door.
• Too much force on garage door will interfere with proper
operation of safety reversal system.
• NEVER increase force beyond minimum amount required to
close garage door.
• NEVER use 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.
Force Adjustment
Controls
Right Panel
ADJUSTMENT LABEL
KG
Open Force
28
9 9 1
1
7 3 7 3
5
5
G K
Antenna
KG
Close Force