4
Assembly
2 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 inch 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.
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" (13 mm)
