Adjustment step 2, Adjust the force, Warning – Craftsman 139.53910 User Manual

Page 28

Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".

Advertising
background image

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.

NO TE:

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.

ák

WARNING

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

fiat) on floor.

HOW AND WHEN TO ADJUST THE FORCES

1. Test the DO W N (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
fuliy. 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.

ADJUSTMENT LABEL

Open Force

Close Force

28

Advertising