Craftsman 139.53939D Manual Del Propietário página 11

ASSEMBLY STEP 5
Set the Tension
• Insert a screwdriver tip into one of the nut ring slots and brace
it firmly against the trolley.
• Placea 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.
Youhave now finished assemblingyour garage door opener.
Please read the following warningsbeforeproceedingto the
installation section.
Square
End
Square End
Trolley
Nut Rin¢
BEFORE
I
-41_ 1"-_1_ 1
(2.5 cm)
Nut Rin,
ER RELEASE
1-1/4"
(3.18 cm)
INSTALLATION
IMPORTANT INSTALLATION INSTRUCTIONS
To reducethe risk of SEVERE INJURYor DEATH:
1. READAND FOLLOWALL INSTALLATION WARNINGSAND
INSTRUCTIONS.
2. Install garage door opener ONLY on properly balanced and
lubricated garage door. An improperly balanceddoor may
NOT reverse when required and could result in SEVERE
INJURYor DEATH.
3. ALL repairs to cables, spring assemblies and other
hardware MUST be made by a trained door systems
technician BEFORE installing opener.
4. DisableALL 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 the emergency releasewithin reach, but at least 6
feet (1.8 m) above the floor and avoiding contact with
vehicles to avoid accidental release.
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 reach of children at minimum height of
5 feet (1.5 m).
• away from ALL moving parts of the door.
10. Placeentrapment warning label on wall next to garage door
control.
11. Place manual 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 SERIOUSPERSONAL INJURYor DEATHfrom
electrocution, disconnect ALL electric and battery power
BEFORE performing ANY service or maintenance.
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