Set The Tension; Installation - 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 releasesand snaps the nut
ring against the trolley.
This sets the spring to optimum belt tension.
Youhave now finishedassemblingyour garage door opener.
P/ease read the following warningsbeforeproceedingto the
insta//ation section.
Square
End
Nut Rinc
(2.5 cm)
f
f
-- Nut Ring Slot
Square End
Trolley
ER RELEASE
1-1/4"
(3.18 cm)
Nut Rin,
INSTALLATION
IMPORTANT INSTALLATION INSTRUCTIONS
To reducethe risk of SEVERE INJURYor 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 reversewhen 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 door control:
• 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
door control.
11. Placemanual release/safety reverse 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 SERIOUSPERSONALINJURYor DEATHfrom
electrocution, disconnect ALL electric and battery power
BEFORE performing ANY service or maintenance.
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