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To avoid possible SERIOUS INJURY to finger from moving garage door opener:
ALWAYS keep hand clear ofsprocket while operating opener.
Securelyattach sprocketcover BEFORE operating.
2.1 Position the chassissupportbracket on the unit.
2.2 Attach the bracketto the rail with 1/4"-20x5/8" hex bolts and lock washers.Do not overtighten.
2.3 Attach the bracketto 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" screwthrough the backflange 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
3.1 Loosen the inner nutand lockwasher 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.
1/2"
Assembly
2 Attach the Chassis Support Bracket
5


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