Adjustthe Force; How And Whento Adjustthe Forces - Craftsman 139.53902D Manual Del Propietário

ADJUSTMENT STEP 2
Adjustthe 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 about3/4 of a
completeturn. 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
KILLED by 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
1-1/2" (3.8 cm) high object (or 2x4 laid flat) on floor.
HOW AND WHENTO ADJUSTTHE FORCES
1. Testthe DOWN(c/ose) 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 duringthe DOWN (close) cycleand
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. Testthe 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'tstop, 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 openat least 5 feet (1.5 m),
INCREASE UP (open) force by turning the control clockwise.
Make small adjustments until door opens completely.
Re-adjust the UP limit if necessary. After each adjustment,
run the opener through a complete travel cycle.
Force Adjustment
Controls
Back Panel
j
ADJUSTMENT LABEL
Open Force
Close Force
28