Craftsman 139.53920D - Manual (Page 28)

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step
2
Adljust the
Force adjustment controls are located on the back
panel of the motor urtii, 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
oGcasiortal 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 (he
door’s downward travel (including binding or
imbalanced doors), it will reverse,
A
WARNING
Without a properly instailed safety reversal system,
persons (particuiariy small children) could be
SERIOUSLY INJURED or KILLED by a closing garage
door
• Too much force on garage door will interfere with
proper aperatiofi 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.
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) fravel. 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 cycSe..
• 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.
F ofcs Adjustment
Controls
Bart parse)
AD.JIJSTMEMT LABEL
Open Fores CfoSB Force
2B