Tightenthe Chainand Cable; Assembly; Installation - Craftsman 139.536481DM Owner's Manual

ASSEMBLY STEP 5
Tightenthe Chainand Cable
• Spin the inner nut and lock washer down the threaded shaft,
away from the trolley.
• To tighten the chain, turn outer nut in the direction shown. As
you turnthe nut, keep the chainfrom twisting.
• When the chain is approximately 1/2" (13 mm) abovethe base
of the rail at its midpoint, re-tighten the inner nut to secure the
adjustment.
Sprocket noise can result if chainis either too looseor too tight.
When installation is complete, you may notice some chain droop
with the door closed. This is normal. If the chain returns to the
position shown when the door is open, do not re-adjust the chain.
NOTE:During future maintenance,AL WAYSpuff the emergency
releasehandle to disconnect trolley before adjusting chain.
You have now finishedassemblingyour garage door opener.
Please read the following warningsbeforeproceedingto the
installationsection.
Lock
OuterNut Washer InnerNut
To Tighten Outer Nut _ ._l._,J __
rL_ ............... '__"",_'_"'T o T, 'g'ht'e'n ....
oj
Inner Nut
Chain
----1/2" (13 mm)
Base!f Rail
INSTALLATION
IMPORTANTINSTALLATION INSTRUCTIONS
To reducethe riskof 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 (2.13 m) or more above
floor.
6. Mount 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. 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.
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