Fasten Rail to the Motor Unit
To avoid installation difficulties, do not run the garage door opener until instructed to do so.
•Remove the two washered bolts mounted in top of motor unit.
•Align rail and styrofoam over sprocket. Cut tape from rail, belt and styrofoam.
•REMOVE STYROFOAM.
•Insert 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.
•Position 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
• By 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.
• Insert a screwdriver tip into one of the nut ring slots | Figure 2 |
and brace it firmly against the trolley (Figure 2). |
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Figure 1 |
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Trolley
Threaded
Shaft
Spring/Trolley Nut
Trolley
Threaded
Shaft
Nut
Ring
Square
End
Nut Ring
Slots
•Place 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
Trolley |
| Nut Ring |
| Trolley |
| Nut Ring |
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BEFORE |
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6