Craftsman 139.53920D owner manual Adjustment Step t, Adjust the UP and Down Travel Limits

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 properlyinstalledsafetyreversalsystem, persons(particularlysmall children) could be

SERIOUSLYINJUREDor KILLEDby a closinggarage door

-Incorrectadjustmentof garagedoor travel limits wilt interferewith properoperationof safetyreversal system,

-if onecontrol (force or travel limits) is adjusted,the other control mayalso needadjustment

•AfterANYadjustmentsaremade,the safetyreversal system MUSTbetested Door MUSTreverseon contactwith 1-1f2"high (3,8 cm) object(or 2x4 laid fiat) on floor

CAUTION ]

To preventdamageto vehicles,be sure fully opendoor ]

providesadequateclearance

J

Cover Prolectlon Bolt

I	V
Lell Side Panel	Umil Adfuetmenl
	Screws

ADJUSTMENT IJ_BEL

ffthe 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.

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