Craftsman 139.53902D Owner's Manual page 8

ASSEMBLY STEP 1
Assemb/ethe Rai/
To avoid installation difficulties, do not run the garage door
opener until instructedto do so.
1. Open the rail carton and remove the contents onto a level work
surface. Keepit clean and free of debris while you are working.
2. Identify the rail sections and orient the sections on a flat
surface as shown. The back rail has a black gear on one end.
The header rail has a black plastic rack inside the rail on the
screw. The remaining section is the center rail.
NOTE: Use caution when handling the center rail section. The
screw can slip out if the section is tipped up too far.
To prevent INJURY from pinching, keep hands and fingers
away from the joints while assembling the rail.
HARDWARESHOWN ACTUALSIZE
Hex Bolt 1/4-20x7/16"
Remove Cardboard Packing
Hanging Brackets
Rail Support Braces
Straight Door Arm
Header Rail Brackets
Rail Assembly
Rail Assembly
@ _
(_ Remove Cardboard Packing
Sprocket Coupling
Remove
Cardboard
Packing
Back
Hex Bolts
1/4-20x7/16"
Hex Bolts
._/4-20x7/16"
Hex Bolts
1/4-20x7/16"
Hex Bolts
1/4-20x7/16"
Header Rail