Assembly; Models 81600, 81602, 81640*, 81650, And 83650-267 - Chamberlain 81600 Manual

Assembly

1 Attach the Rail to the Garage Door Opener

Models 81600, 81602, 81640*, 81650, and 83650-267

* Can be installed with a T-Rail or a Square Rail. For Square Rail assembly steps, see instructions
provided with the rail kit model LMSSRKIT. Once completed, return to this manual for the installation
instructions.
To avoid possible SERIOUS INJURY to finger from moving garage door opener:
• ALWAYS keep hand clear of sprocket while operating opener.
• Securely attach sprocket cover BEFORE operating.
To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in
the top of the opener.
NOTE: ONLY use the bolts removed from the garage door opener. Place the garage door opener on
the packing material to prevent scratching.
1. Remove the two bolts from the top of the garage door opener.
2. Align the rail and the styrofoam over the sprocket. Cut the tape from the rail, chain, and
styrofoam.
3. Fasten the rail with the previously removed bolts.
4. Position the chain around the garage door opener sprocket.
5. Models 81600 and 81602: Attach the sprocket cover over the garage door opener sprocket
and attach with hex screws.
Models 81640, 81650, and 83650-267: Install the sprocket cover by squeezing the sides
and inserting the tabs into the slots on the garage door opener.
Washered Bolt
Hex Screw
5/16"-18x1/2"
#8x3/8"
Models 81600 and 81602
Washered Bolt 5/16"-18 x 1/2"
(Mounted in the garage door opener)
Models 81640, 81650, and 83650-267
2 Tighten the Chain
1. Loosen the inner nut and lock washer on the trolley threaded shaft.
2. Tighten the outer nut until the chain is a 1/2" above the base of the rail at the midpoint
of the rail.
3. Re-tighten the inner nut.
Slack in the chain is normal when the door is closed. No readjustment is necessary.
Sprocket noise can result if the chain is too loose. During future maintenance, ALWAYS pull the
emergency release handle to disconnect the trolley before adjusting the chain.
8
1/2" (13 mm)