Install The Trolley; Attach The T-Rail To The Motor Unit - Chamberlain Power Drive Security+ PD612C Owner's Manual

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

Attach 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).