9
Assembly
STEP 5 Tighten the chain
1. Spin the inner nut and lockwasher down the trolley threaded shaft,awayfrom the trolley.
2. To tighten the chain, turn the outer nut in the direction shown.
3. When the chain is approximately1/4" (6 mm) above the base of the rail at it'smidpoint, re-tighten
the inner nut to secure the adjustment.
Sprocketnoise can result if the chain is too loose or too tight. When installation is complete, you may
notice some chain droop with the door closed. This is normal. Ifthe chain returns to the position shown
when the door is open,do not re-adjust the chain.
NOTES: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.
Base of Rail
Mid length of Rail
Chain
1/4" (6 mm)
Outer
Nut
Lock
Washer
Trolley
Threaded
Shaft
Inner Nut
To Tighten
Inner Nut
To Tighten Outer Nut
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