Craftsman 1/2 HP GARAGE DOOR OPENER 139.53978SRT - Manual (Page 17)

Installation Step 5
Hang the Opener
Two representative installations are shown. Yours
may be different. Hanging brackets should be
angled, Figure 1, to provide rigid support. On
finished ceilings, Figure 2, attach a sturdy metal
bracket to structural supports before installing the
opener. The bracket and fastening hardware are not
provided. See accessory page 38.
1. Measure the distance from each side of the
opener to the structural support.
2. Cut both pieces of the hanging bracket to
required lengths.
3. Drill 3/16" pilot holes in the structural supports.
4. Attach one end of each bracket to a support with
5/16"-18x1-7/8" lag screws.
5. Fasten the opener to the hanging brackets with
5/16"-18x7/8" screws, lock washers and nuts.
6. Check to make sure the T-rail is centered over
the door (or in line with the header bracket if the
bracket is not centered above the door).
7. Remove the 2x4. Operate the door manualiy. if
the door hits the rail, raise the header bracket.
NOTE: Do NOT connect power to opener at this
tim e.
The opener could fall and Injure someone if it
is not properly secured. Fasten the opener
securely to structural supports of the garage.
Figure 1
5/16"-18j<7/a’ Screw
5/16' Lock Washer
5/16'-18Nut
Figure 2
17