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Chamberlain 7320-1 HP Owner's Manual page 9

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ASSEMBLY STEP 2
Install the Trolley
NOTE: If trolley hits against any nuts on the T-rail,
the bolts and nuts were attached from the wrong
side and must be repositioned. Review Assembly
Step 1.
ASSEMBLY STEP 3
Fasten the T-Rail to the Motor Unit
NOTE: This bolt prevents trolley over-travel. Keep a
2" minimum between the trolley and this bolt when
adjusting travel limits (see page 28).

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