Craftsman 139.53901DM1/2 HP Manual Del Propietário página 11

ASSEMBLY STEP 5
Tightenthe Chain
• Spin the innernut and lockwasher down the trolley threaded
shaft, away from the trolley.
• To tighten the chain, turn outer nut in the direction shown
(Figure 1).
• 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.
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, AL WAYSpuff 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 if necessary. Thenrepeat Adjustment Step 3.
Youhave now finished assemblingyour garage door opener.
Please read the following warningsbeforeproceedingto the
installation section.
Figure1
Figure2
Trolley
Outer Lock Threaded
Nut Washer Shaft
To Tighten Outer Nut
Inner Nut
To Tighten
Inner Nut
I
Chain
Base(
1/4"(6 mm)
Mid length of Rail
INSTALLATION
IMPORTANT INSTALLATION INSTRUCTIONS
To reducethe risk of SEVERE INJURYor DEATH:
1. READAND FOLLOWALL INSTALLATIONWARNINGSAND
INSTRUCTIONS.
2. Install garage door opener ONLYon properly balancedand
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. Disable ALL locks and remove ALL ropes connected to
garage door BEFORE installing opener to avoid entanglement.
5. Install garage door opener 7 feet (2.13 m) or more above
floor.
6. Mount the emergency releasewithin reach, but at least 6 feet
(1.83 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. Place manual release/safety reversetest 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.
11