Adjustment step 1, Adjust the up and down travel limits, How and when to adjust the limits – Craftsman 1/2 HP GARAGE DOOR OPENER MODEL 139.5364812 User Manual

Page 27: Warning, Caution

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Adjust the UP and DOWN Travel


Limit adjustment settings regulate the points at which

the door will stop when moving up or down.

To operate the opener, press the Door 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 unless the reversing test
fails (Adjustment Step 3, page 29).

Adjustment procedures are outlined below. Read the
procedures carefully before proceeding to
Adjustment Step 2. Use a screwdriver to make limit
adjustments. Run the opener through a complete
travel cycle after each adjustment.

NOTE: Repeated operation of the opener during
adjustment procedures may cause the motor to
overheat and shut off. Simpiy wait 15 minutes and

try again.

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.


If the door does not open completely but opens

at least five feet (1.5 m):

Increase up travel. Turn the UP limit adjustment

screw clockwise. One turn equals 2" (5 cm) of

NOTE: To prevent the trolley from hitting the cover

protection bolt, keep a minimum distance of 2-4"

(5-10 cm) between the trolley and the bolt

• If door does not open at least 5 feet (1.5 m):

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" (5 cm) of travel.

If door still won't close completely and the trolley
bumps Into the pulley bracket (page 4), try
lengthening the door arm (page 25) and

decreasing the down limit.

If the opener reverses in fully closed position:

Decrease down travel. Turn the down limit

adjustment screw clockwise. One turn equals 2"
(5 cm) of travel.



Without a properly installed safety reversal system,
persons (particularly small children) could be
SERIOUSLY INJURED or KILLED by a closing garage
• Incorrect adjustment of garage door travel limits will

interfere with proper operation of safety reversal


• 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 f-1/2" (3.8 cm) high object (or 2x4 laid
flat) on floor.


To prevent damage to vehicles, be sure fully open door

provides adequate clearance.

Adjustment Label

If the door reverses when closing and there is
no visible interference to travel cycle:

If the opener lights are flashing, the Safety
Reversing Sensors are either not installed,
misaligned, or obstructed. See Troubleshooting,
page 22.

Test the door for binding: Pull the emergency

release handle. Manually open and close the door.
If the door is binding or unbalanced, call for a

trained door systems technician. If the door is

balanced and not binding, adjust the DOWN
(close) force. See Adjustment Step 2.