Adjustment Section: Pages; Travel Limit Adjustments - Craftsman 139.53915SRT- 1/2 HP Owner's Manual

Adjustment Step 1
Adjust the UP and DOWN Limits
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
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.
The following chart outlines adjustment procedures. 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 chart carefully before proceeding to Adjustment Step 2. Use a screwdriver to make limit adjustments.
If the door does not open completely
at least five feet
but opens
Increase up travel. Tum the UP limit adjustment
screw clockwise. One tum 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
down travel. Tum the DOWN limit adjustment
Increase
screw counterclockwise. One turn equals 2" of travel.
If door still won't close completely, try lengthening the
door amm. (Page 26.)
If you have adjusted the door amm to the maximum
length and the door still will not close completely,
lower the header bracket. See Installation Step 1,

Adjustment Section: Pages 28 - 30

reverse in the
When to Adjust the Limits
Improper adjustment of the travel limits could
interfere with the proper operation of the safety
reverse system. See page
reverse when required and could serlously iniure or
kill someone under it.
reverses in fully closed position
If the opener
down travel. Tum the DOWN limit adjustment
Decrease
screw dodkwise. One tum equals 2" of travel.
reverses when closing and there
If the door
is no visible interference to travel cycle
If the opener iights are flashing, the Safety Reversing
Sensor is obstnucted. 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
28
30. The door might not