Install Trolley; Fasten T-Rail To Opener - Chamberlain Series 651-2MM-1/2HP Owner's Manual

Assembly Step 2
Install the Trolley on the T-rail
• Attach the threaded shaft to the trolley with the
lock washer and nuts as shown.
Outer Nut
5/16"
Trolley
Temporary Stop
Screwdriver
Assembly Step 3
Fasten the T-rail to the Opener
• 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.
Hardware Shown Actual Size
Hex Screw
5/16"-18x7/8"
Lock
Washer
5/16"
Trolley
Threaded
Shaft
Inner Nut
5/16"
Nut Lock Washer
5/16"
5/16"-18
Hardware Shown Actual Size
Trolley
Lock Washer
5/16"
Trolley
• 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 any nuts on the T-rail, the
Washered Screw
bolts and nuts were attached from the wrong
5/16"-18x1/2"
side and must be repositioned. Review Step 1.
Hex Screw
5/16" 18 7/8"
To fasten rail, use only those screws mounted
in the top of the opener. Any other screws will
cause serious damage to the opener.
Washered Screw
5/16"-18x1/2"
Hex Screw
5/16"-18x7/8"
Trolley
Stop Hole
T-Rail
(Back Section)
Lock Washer
5/16"
Nut
5/16"-18
9
Shaft
Inner Nut
5/16"
Nut
5/16"-18
USE ONLY THIS
TYPE AND SIZE
CAUTION
USE ONLY THIS
TYPE AND SIZE
SCREW
Trolley