![Craftsman 139.18815 Owner'S Manual Download Page 9](http://html.mh-extra.com/html/craftsman/139-18815/139-18815_owners-manual_69398009.webp)
Assembly Step 2
Install the Trolley on the T-rail
• Place the opener on packing material to protect
the cover. For convenience, put a support under
the cable pulley bracket.
• Remove the (2) 5/16"-18x1/2" washered screws
mounted in the top of the opener.
• Align the holes in the back section of the T-rail with
the holes in the opener.
• Fasten the rail with the (2) washered screws
previously removed. Tighten securely.
Remember to use only these screws! Any other
screws will cause serious damage to the opener.
• Insert a 5/16"-18x7/8" hex screw into the trolley
stop hole in the T-rail as shown. Tighten securely
with a 5/16" lock washer and nut. This screw limits
trolley travel in the UP direction.
Use Only This
Type and Size
Screw
Washered Screw
5/16"-18x1/2"
T-rail
(Back Section)
Trolley
Stop Hole
Nut
5/16"-18
Hex Screw
5/16"-18x7/8"
Lock Washer
5/16"
9
• Attach the threaded shaft to the trolley with the
lock washer and nuts as shown.
• As a temporary stop, insert a screwdriver into the
hole in the front end of the T-rail.
• Slide the trolley assembly along the rail to the
screwdriver stop.
If trolley hits against the nut on the T-rail, the
bolts and nuts were attached from the wrong
side and must be repositioned. Review Step 1.
Use Only This
Type and Size
Screw
Temporary Stop
Screwdriver
Trolley
TO GARAGE DOOR
Washered Screw
5/16"-18x1/2"
T-rail
(Back Section)
Trolley
Stop Hole
Hex Screw
5/16"-18x7/8"
Lock Washer
Trolley
Threaded Shaft
Lock Washer
5/16"
Outer Nut
5/16"
Inner Nut
5/16"
Trolley
Assembly Step 3
Fasten the T-rail to the Opener
To fasten rail, use only those screws mounted
in the top of the opener. Any other screws will
cause serious damage to the opener.
Lock Washer
5/16"
Nut
5/16" -18
Hardware Shown
Actual Size
Nut
5/16"-18
Lock Washer
5/16"
Hex Screw
5/16"-18x7/8"
Hardware Shown Actual Size
CAUTION