Adjustment Section: Pages 28 - 30

Adjustment Step 1

Adjust the UP and DOWN Limits

Do not make any limit adjustments until the safety reversing sensors are completely installed.

Limit adjustment settings regulate the points at which the door will stop when moving up or down.

The door will stop in the up direction if anything interferes with door travel. The door will reverse in

the down direction if anything interferes with the door travel (including binding or unbalanced doors).

To operate the opener, press the Wall Control push bar. Run the opener through a complete travel cycle.

•Does the door open and close completely?

•Does the door stay closed and not reverse unintentionally when fully closed?

If your door passes both of these tests, no limit adjustments are necessary.

Improper adjustment of the travel limits will

interfere with the proper operation of the safety reverse system. The door might not

reverse properly when required and could seriously injure or kill someone under it. Test

the safety reverse system following all adjustments to the travel limits. See page 30.

000

Left Side Panel

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LimitAdjustment

Screws

INCREASE

DOWNUP

TRAVEL TRAVEL

Adjustment Labet

Adjustment procedures are outlined below. Run the opener through a complete travel cycle after each adjustment.

Repeated operation of the opener during adjustment procedures may cause the motor to overheat and shut off. Simply wait 15 minutes and try again.

Read the procedures carefully before proceeding to Adjustment Step 2. Use a screwdriver to make limit adjustments.

How and When

If the door does not open completely but opens at leastfive feet

Increase up travel. Turn the UP limit adjustment screw clockwise. One turn equals 2" of travel.

If door does not open at least 5 feet: Adjust the UP (open) force as explained in Adjustment Step 2.

If the door does not close completely

Increase down travel. Turn the DOWN limit adjustment screw counterclockwise. One turn equals 2" of travel.

If door still won'tclose completely, try lengthening the door arm. (See Page 26.)

If you have adjusted the door arm to the maximum length and the door still will not close completely, lower the header bracket. See Installation Step 1, pages 12and 13.

to Adjust the Limits

If the opener reverses in fully closed position

Decrease down travel. Turn the DOWN limit

adjustment screw clockwise. One turn equals 2" of travel.

If the door reverses when closing and

there is no visible interference to travel cycle

If the opener lights are flashing, the Safety Reversing Sensor is obstructed. Remove the obstruction.

Test the door for binding: Pull the emergency release handle. Manually open and close the door. If the door is binding, call for garage door service. If the door is not binding or unbalanced, adjust the DOWN (close) force. See Adjustment Step 2.

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Sears 139.53640SRT, 139.53636SRT Adjustment Section Pages 28 Adjustment Step, Adjust the UP and Down Limits, How and When
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