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9
Assembly
STEP 5 Tighten the chain
1. Spin the inner nut and lock washer down the trolley threaded shaft, awayfrom the trolley.
2. To tighten the chain, turn the outer nutin the direction shown.
3. When the chain isapproximately1/4" (6 mm) above the base of the rail at it's midpoint,re-
tighten the inner nutto secure the adjustment.
Sprocketnoise can result ifthe chain is too loose.
When installation is complete,you may notice some chain droop with the door closed. This isnormal. If
the chain returns to the position shown when the door is open,do notre-adjustthe chain.
NOTES:During future maintenance, ALWAYS pull the emergency release handle to disconnect the
trolley before adjusting the chain.
You may notice loosening of the chain after Adjustment Step 3 (Test the Safety Reversal System). Check
for proper tension and readjust chain if necessary. Then repeat Adjustment Step 3.
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
Base of Rail
Mid length of Rail
Chain
1/4" (6 mm)
10


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