Tighten The Chain; Installation - Craftsman 139.53985DM Owner's Manual

ASSEMBLY STEP 5
Tighten the 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 (Figure 2).
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.
NOTE: During future maintenance, ALWAYS pull the
emergency release handle to disconnect trolley before
adjusting chain.
NOTE: You may notice loosening of chain after
Adjustment Step 3 (Test the Safety Reversal System).
Check for proper tension and readjust chain ff necessary.
Then repeat Adjustment Step 3.
You have now finished assembling your garage door
opener. Please read the following warnings before
proceeding to the installation section.
Figure 1
Figure 2
Trolley
Outer Lock Threaded
Nut Washer Shaft
To Tighten Outer Nut
Nut
To Tighten
Inner Nut
L
Chain
_ 1/4" (6 mm)
Base f Rail Mid length of Rail
INSTALLATION
IMPORTANT INSTALLATION INSTRUCTIONS
To reduce the risk of SEVERE INJURY or DEATH:
1. READAND FOLLOWALL INSTALLATION WARNINGSAND
INSTRUCTIONS.
2. Install garage door opener ONLYon 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. NEVER wear 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/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.
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