Tightenthe Chain; Installation - Craftsman 139.30437 Owner's Manual

ASSEMBLY STEP 5
Tightenthe Chain
1. Spin the inner nut and lock washer down the trolley threaded
shaft, away from the trolley.
2. To tighten the chain, turn outer nut in the direction shown
(Figure 1).
3. When the chain is approximately 1/4" (6 mm) above the base
of the rail at its midpoint, re-tighten the inner nut to secure the
adjustment.
4. Position the sprocket cover over the garage door opener
sprocket and attach with 8x3/8" hex screws.
Sprocket noise can result if chain is too loose. 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
in Figure 2 when the door is open, do not re-adjust the chain.
NOTES:
• During future maintenance,ALWAYS pull the emergency
release handle to disconnect trolley before adjusting chain.
• You may notice loosening of chain aflerAdjustment Step 2
(Test the Safety Reversal System). Check for proper tension
and readjust chain if necessary. Then repeatAdjustment
Step 2.
Youhave now finished assemblingyour garage door opener.
Please read the following warningsbeforeproceedingto the
installation section.
Figure 1
Trolley
Outer Lock Threaded
Nut Washer Shaft
To Tighten Outer Nut
Inner Nut
To Tighten
Inner Nut
Figure 2
I
Chain
Base !f Rail
1/4" (6 mm)
,,
Mid length of Rail
HARDWARESHOWN
ACTUALSIZE
Hex Screw 8x3/8"
Hex Screws
Sprocket
INSTALLATION
IMPORTANT INSTALLATION INSTRUCTIONS
To reducethe riskof SEVERE INJURY or 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) abovethe 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.
13. DONOT enable the Timer-to-Close functionality if operating
either one-piece or swinging garage doors. To be enabled
ONLYwhen operating a sectional door.
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