Tighten The Chain - Chamberlain 8587 Manuel

Assembly
2 Attach the Chassis Support Bracket
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.
2.1
Position the chassis support bracket on the unit.
2.2
Attach the bracket to the rail with 1/4"-20x5/8" hex bolts and lock washers. Do not overtighten.
2.3
Attach the bracket to the opener by inserting a 5/16"-18x1/2" washered screw through a hole in each side flange and a matching hole in the
bracket. Complete the connection by inserting the #8-32x3/8" screw through the back flange and the hole in rail support .
3

Tighten the Chain

3.1
Loosen the inner nut and lock washer on the trolley threaded shaft.
3.2
Tighten the outer nut until the chain is a 1/2 inch above the base of the rail at the midpoint of
the rail.
3.3
Re-tighten the inner nut.
Slack in the chain is normal when the door is closed. No readjustment is necessary.
NOTE: 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.
5
Hex Bolt
Lock
1/4"-20x5/8"
Washer
Screw
#8-32x3/8"
Washerd Bolt
5/16"-18x1/2"
1/2"