Assembly - Chamberlain 8557 Manual

Assembly

1
Attach the rail to the garage door opener
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.
HARDWARE
Washered Bolt
5/16"-18x1/2"
(Mounted in the
garage door opener)
Model 8550 (2)
Model 8557 (1)
Lock Nut
(Mounted in the
garage door opener)
Model 8557 (1)
Hex Screw
#8x3/8"
(Packed with the
sprocket cover)
NOTE: ONLY use the bolts removed from the
garage door opener. Place the garage door
opener on the packing material to prevent
scratching.
1.1
Remove the two bolts from the top of the
garage door opener.
1.2
Align the rail and the styrofoam over the
sprocket. Cut the tape from the rail, belt,
and styrofoam.
1.3
Model 8550:
Fasten the rail with the previously
removed bolts.
Model 8557:
Fasten the rail with the previously
removed washer bolt and lock nut.
1.4
Position the belt around the garage
door opener sprocket.
1.5
Attach the sprocket cover over the
garage door opener sprocket and
attach with hex screws.
Model 8550
Washered Bolt
5/16"-18x1/2"
Model 8557
Washered Bolt
5/16"-18x1/2"
Lock Nut
4
Hex Screw
#8x3/8"
Hex Screw
#8x3/8"