Adjust The Travel Limits - Craftsman 139.53920D Owner's Manual

ADJUSTMENT STEP t
Adjust the UP and DOWN Travel
Limits
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 Simply wait 15 minutes and
try again ff 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
HOW AND WHEN TO ADJUST THE LIMITS
°ff the door does not open completely but opens
at least five feet (1.5 m):
Increase up travel Turn the UP fimit adjustment
screw clockwise, One turn equals 2" (5 cm) of
travel,
NOTE: To prevent the trolley from hitting the cover
protection bolt, keep a minimum distance of
2-4" (5 cm - 10 cm) between the trolley and the
bolt,
• ff door does not open at least 5 feet (1.5 m):
Adjust the UP (open) force as explained in
Adjustment Step 2
• ff the door does not close completely:
Increase down travel Turn the down Fimit
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
• ff 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 properlyinstalled safety reversalsystem,
persons (particularlysmall children) could be
SERIOUSLY INJURED or KILLED by a closing garage
door
- Incorrect adjustment of garagedoor travel limits wilt
interfere with proper operationof safety reversal
system,
- if one control (force or travel limits) is adjusted,the
other control may also need adjustment
• After ANYadjustmentsare made,the safety reversal
system MUSTbe tested Door
MUST
reverseon
contact with 1-1f2"high (3,8 cm) object (or 2x4 laid
fiat) on floor
CAUTION ]
To preventdamageto vehicles,be sure fully open door ]
providesadequateclearance |
J
Cover Prolectlon Bolt
I V
Lell Side Panel Umil Adfuetmenl
Screws
ADJUSTMENT IJ_BEL
ff 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,
misafigned, 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 tf the door is
balanced and not binding, adjust the DOWN
(close) force. See Adjustment Step 2.
27