Adjustment; Adjust The Force - Craftsman 139.53920D Owner's Manual

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 doer 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 properlyinstalled safety reversalsystem,
persons (particufariysmall children)could be
SERIOUSLY INJUREDor KILLEDby a ctesing garage
door
• Too much force on garagedoor will interfere with
proper operationof safety reversatsystem
• NEVER increaseforce beyondminimum amount
requiredto close garagedoor
• NEVER useforce adjustmentsto compensatefor a
binding or sticking garagedoor
• if one control (force or travel limits) is adjusted,the
other control may also need adjustment
• After ANYadjustmentsare made,the safety reversal
system MUSTbe tested Door MUSTreverseon
contactwith 1-It2" high (38 cm) obiect (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 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 untii 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 smatl
adjustments until the door stops easily and opens
fully. After each adjustment, run the opener
through a complete travei cycle..
• If the door doesn't open at least 5 feet (1.5 m),
INCREASE UP (open) force by turning the
control clockwise.. Make sma!i adjustments untit
door opens completely Readjust the UP limit if
necessary. After each adjustment, run the opener
through a complete travef cycle.
Fome Adjustment
Controls
E:::::::3
ADJUSTMENT LABEL
Open Force CIose Fo:ree
28