Set The Tension; Installation Safety Instructions - Craftsman 139.53939D Owner's Manual

ASSEMBLY STEP 5
Set the Tension
• Insert a screwdriver tip into one of the nut ring slots
and brace it firmly against the trolley.
• Place a 7/16" open end wrench on the square end.
Rotate the nut about 1/4 turn until the spdng releases
and snaps the nut ring against the trolley.
This sets the spring to optimum belt tension.
You have now finished assembling your garage door
opener. Please read the following warnings before
proceeding to the installation section.
Square
End
S
Trolley
(25 cm) (318 cm)
iNSTALLATiON
IMPORTANT INSTALLATION INSTRUCTIONS
To reduce the risk of SEVERE INJURY or DEATH:
1. READAND FOLLOW ALL INSTALLATION WARNINGS
AND INSTRUCTIONS_
2. Installgaragedoor opener ONLYon properly balanced
and lubricated garagedoor.An improperly balanceddoor
may not reversewhen requiredand couldresult in
SEVERE INJURYor DEATH.
3_ ALL repairs to cables,spring assemblies and other
hardware MUSTbe madeby a traineddoor systems
technician BEFORE installing opener..
4_ Disable ALL locks and remove ALL ropesconnected to
garagedoor BEFORE installing opener to avoid
entanglemenL
5. Installgaragedoor opener 7 feet (2A m) or moreabove
fioor_
6. Mountemergency release handle6 feet (18 m) above
floor
7 NEVER connect g aragedoor openerto powersource until
instructedto do so.
8, NEVER wearwatches,rings or loose clothing while
installing or servicingopener.They couldbe caught in
garagedoor or opener mechanisms_
9. Install walFmountedgarageSmart Control Panelm:
• within sight of the garagedoor.
• out of reachof childrenat minimum heightof 5 feet
(15 m),
• away from ALL moving parts of the door.
10. Placeentrapmentwarning label on wall next to garage
Smart Control Panel
TM
11 Placemanualreleaseleafety reversetest label in plain
view on inside of garagedoor.,
12. Uponcompletion of installation,test safetyreversal
system_Door MUSTreverseon contact with a 1-112"
(3.8 cm) high object (or a 2x4 laid flat) on the floor
13., T o avoidSERIOUS PERSONAL INJURYor DEATHfrom
electrocution, disconnectALL electricand battery power
BEFORE performing ANY serviceor maintenance..
11