Attach the Rail to the Motor Unit
To avoid installation difficulties, do not run the garage door opener until instructed to do so.
ïRemove the two washered bolts mounted in top of motor unit.
ïAlign rail and styrofoam over sprocket. Cut tape from rail, belt and styrofoam.
ïREMOVE STYROFOAM.
ïInsert both washered bolts through the rail into the motor unit. Tighten bolts securely.
Use only these bolts! Use of any other bolts will cause serious damage to door opener.
ïPosition belt over the motor unit sprocket.
CAUTION
To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in the top of the opener.
Washered Bolts 
Sprocket
Foam Packaging
ASSEMBLY STEP 2
Set the Belt Tension
ïBy hand, thread the spring trolley nut on the threaded shaft until it is finger tight against the trolley (Figure 1). Do not use any tools.
ïInsert a screwdriver tip into one of the nut ring slots and brace it firmly against the trolley (Figure 2).
Figure 1
Trolley
Trolley
Threaded
Shaft
Spring
Trolley Nut
Figure 2 |
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Square End |
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Trolley |
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ïPlace a 7/16" open end wrench on the square end. Rotate about 1/4 turn until the spring releases and snaps the nut ring against the trolley (Figure 3).
This extends the spring for optimum belt tension. | Figure 3 |
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BEFORE |
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6