6
ASSEMBLY STEP 1
Attach the Rail to the Motor Unit
To avoid installation diffi culties, do not run the garage
door opener until instructed to do so.
• Remove the bolt and lock nut from the top of the motor
unit.
• Place rail onto the bolt mounted on the motor unit and
align the back hole with the hole in the top of the unit.
• Fasten rail with the washered bolt and lock nut
previously removed. Tighten securely.
Remember
to use only these bolts/fasteners! Any other bolts/
fasteners will cause serious damage to the opener
.
• Cut tape from rail, belt and styrofoam.
• REMOVE
STYROFOAM.
• Position belt over the motor unit sprocket.
To avoid SERIOUS damage to opener, ONLY use
bolts/fasteners mounted in top of motor unit.
ASSEMBLY STEP 2
Set the Belt Tension
• By hand, thread the spring trolley nut on the threaded
shaft until it is fi nger tight against the trolley (Figure 1).
Do not use any tools.
• Insert a screwdriver tip into one of the nut ring slots
and brace it fi rmly against the trolley (Figure 2).
• 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 1
Figure 2
Figure 3
Rail Hole
Washered Bolt
5/16"-18x1/2"
Sprocket
Lock Nut
Styrofoam
Spring/Trolley Nut
Trolley
Threaded
Shaft
Nut Ring
Slots
Trolley
Threaded
Shaft
Nut
Ring
Square
End
AFTER RELEASE
1-1/4" (3.18 cm)
BEFORE 1"
(2.5 cm)
Nut Ring
Trolley
Trolley
Nut Ring