11
Assembly
2 Attach the Chassis Support Bracket
Models 8587W, 8587WL, and 8580WLB
To avoid possible SERIOUS INJURY to finger from moving garage door opener:
l ALWAYS keep hand clear of sprocket while operating opener.
l Securely attach sprocket cover BEFORE operating.
1. Position the chassis support bracket on the unit.
2.
Attach the bracket to the rail with 1/4"-20 x 5/8" hex bolts and lock washers. Do not
overtighten.
3. Attach the bracket to the opener by inserting a 5/16"-18 x 1/2" washered screw through a hole
in each side flange and a matching hole in the bracket. Complete the connection by inserting
the #8-32 x 3/8" screw through the back flange and the hole in rail support.
Washerd Bolt
5/16"-18x1/2"
Screw
#8-32x3/8"
Hex Bolt
1/4"-20x5/8"
Lock
Washer
3 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.
Model 8580WLB Only: If the tension is not correct with a 7' rail installed, remove two links from the
chain to set the correct tension.
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