3Ghten The Chain; Installation; Installation Safety Instructions - Craftsman 139.53920D Owner's Manual

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, reqighten
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 puff 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 ff necessar]z 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 Tro!ley
Outer Lack Threaded
Nut Washer Shatl
To _ghlen Outer Nut _ ,
/
U _ TO Tlghlen
Figure 2
Chain
i
Base el Ra Mid length ut Roll
_._b1,_, ,,,u_, L , i i L J L_ i , Jl ULLL_ LL
±H LuJl
INSTALLATION
IMPORTANT INSTALLATION INSTRUCTIONS
To reduce the risk of SEVERE INJURY or DEATH:
1 READANDFOLLOW ALL INSTALLATION WARNINGS
AND INSTRUCTIONS.
2 Install garagedoor opener only on properly balanced
and lubricated garagedoor An improperly balanced
door may net reversewhen required and could result in
SEVERE INJURYor DEATH
3 All repairsto cables,spring assembliesand other
hardwareMUSTbe madeby a traineddoor systems
technicianBEFORE installing opener,
4 Disableatt locks and remeveall ropesconnectedto
garagedoor BEFORE installing openerto avoid
entanglement..
5 Install garagedoor opener 7 feet (2 13 m) or more
abovefloor
6 Mount emergencyreleasehandle6 feet (183 m) above
floor
7 NEVER connectgaragedoor openerto power source
until instructedto do so
8..NEVER wearwatches,rings or loose clothing while
instalgng or servicingopener They could be caught in
garagedoor or openermechanisms,
9 Install walt-mountedgaragedoor control:
• within sight of the garagedoor.
, out of reachof children at minimum height of 5 feet
(15 m).
• awayfrom all moving parts of the door
I0 Placeentrapmentwarninglabel on wal! next to garage
door control
11 Placemanua]release/safety reversetest label in plain
view on insideof garagedoor
12 Uponcompletion of installation,test safety reversal
system Door MUSTreverseon contactwith a
I-1t2" (38 cm) high object (or a 2x4 laid flat) on
the floor
11