Craftsman 139.53920D - Manual (Page 11)

ASSEMBLY STEP 5
Tighten the Chain
• Spin the inner nut and lock washer 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 dosed 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. You may notice loosening of
chain after Adjustment Step 3 (Test the Safety
Reversal System) Check for proper tension and
readjust chain if 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
Trolley
Oiitof Lock Thread od
Nut Wustier Shaft
Bijse o! Bail Mid length ol Bail
iMSTALLATiON
IMPORTANT INSTALLATION INSTRUCTIONS
A^WARNING
To reduce the risk of SEVERE INJURY or DEATH:
- READ AND FOLLOW ALL INSTALLATION WARNINGS
AND INSTRUCTIONS,,
. Install garage door opener only on properly balanced
and lubricated garage door An improperly balanced
door may not reverse when required and could result in
SEVERE INJURY or DEATH.
All repairs to cables, spring assemblies and other
hardware MUST be made by a trained door systems
tachnidan BEFORE installing opener.
Disable all locks artd remove all ropes connected to
garage door BEFORE installing opener to avoid
entanglement,,
Install garage door opener 7 feet (213 m) or mors
above floor.
Mount emergency release handle 6 feet (1 B3 m) above
floor
, NEVER connect garage door opener to power source
until instructed to do so.
8-, NEVER wear watches, rings or loose clothing while
instaH'mg 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. Place entrapment warning label on wall next to garage
door control
11. Place manual reiease/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 fioor
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