10
Assembly
STEP 5 Tighten the chain
1. Spin the inner nut and lock washer down the trolley threaded shaft, away from the trolley.
2. To tighten the chain, turn the outer nut in the direction shown.
3. When the chain is approximately 1/4" (6 mm) above the base of the rail at the midpoint, retighten the inner
nut to secure the adjustment.
Sprocket noise can result if the chain is too loose. When installation is complete, you may notice some chain droop
with the door closed. This is normal. If the chain returns to the position shown when the door is open, do not re-adjust
the chain.
NOTE: During future maintenance, ALWAYS pull the emergency release handle to disconnect the trolley before
adjusting the chain.
You have now finished assembling your garage door opener. Please read the following warnings before
proceeding to the installation section.
Outer
Nut
Lock
Washer
Trolley
Threaded
Shaft
Inner Nut
To Tighten
Inner Nut
To Tighten
Outer Nut
Mid length of RailBase of Rail
Chain
1/4" (6 mm)
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