Set The Tension - Craftsman 139.53918d Owner's Manual

ASSEMBLY STEP 5
Set the Tension
• Insert a screwdriver tip into one of the nut ring slots
and brace it firmly against the trolley.
• Place a 7/16" open end wrench on the square end.
Rotate the nut about 1/4 turn until the spring releases
and snaps the nut ring against the trolley.
This sets the spring to optimum belt tension.
You have now finished assembling your garage door
opener. Please read the following warnings before
proceeding to the installation section.
Square
End
S j
Trolley
Nut Ring
I AFTERRE'EASE
1-1/4"
(2.5 cm) (3.18 cm)
Nut Rin(
INSTALLATION
IMPORTANT INSTALLATION INSTRUCTIONS
To reduce the risk of SEVERE INJURY or DEATH:
1. READAND FOLLOWALL INSTALLATION WARNINGS
AND INSTRUCTIONS.
2. Install garage door opener ONLYon properly balanced
and lubricated garage door. An improperly balanced door
may not reverse when required and could result in
SEVEREINJURYor DEATH.
3. ALL repairs to cables, spring assemblies and other
hardware MUST be made by a trained door systems
technician BEFORE installing opener.
4. Disable ALL locks and remove ALL ropes connected to
garage door BEFORE installing opener to avoid
entanglement.
5. Install garage door opener 7 feet (2.1 m) or more above
floor.
6. Mount emergency releasehandle 6 feet (1.8 m) above
floor.
7. NEVERconnect garage door opener to power source until
instructed to do so.
8. NEVERwear watches, rings or loose clothing while
installing or servicing opener.They could be caught in
garage door or opener mechanisms.
9. Install wall-mounted garage control console:
• within sight of the garage door.
• out of reachof children at minimum height of 5 feet
(1.5 m).
• away from ALL moving parts of the door.
10. Place entrapment warning label on wall next to garage
control console.
11. Place manual release/safetyreverse test label in plain
view on inside of garage door.
12. Upon completion of installation, test safety reversal
system. Door MUST reverse on contact with a 1-1/2"
(3.8 cm) high object (or a 2x4 laid flat) on the floor.
13. To avoid SERIOUSPERSONAL INJURY or DEATHfrom
electrocution, disconnect ALL electric and battery power
BEFORE performing ANYservice or maintenance.
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