Chamberlain 84505R - Attach Chain Rail to Opener; Tighten the Chain

11
Assembly
1 Attach Chain Rail to the Garage Door Opener Model
84602
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 holes in the rail with the holes in the garage door opener.
3. Fasten the rail with the previously mentioned bolts. Cut away and discard the tape and Styrofoam from
around the rail.
4. Position the chain around the garage door opener sprocket.
5. Position the sprocket cover over the garage door opener sprocket and attach with hex screws.
Hex Screw
#8x3/8"
(Packed with the
sprocket cover)
HARDWARE
Washered Bolt 5/16"-18x1/2"
(Mounted in the garage door opener)
Models 87504-267, 84501
Washered Bolt
5/16"-18x1/2"
Hex Screw
#8x3/8"
2 Tighten the Chain for Model 84602
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.
1/2" (13 mm)