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 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 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.
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
Trolley Threaded Shaft
Spring/Trolley Nut
Trolley
Threaded
Shaft
Trolley
BEFORE
1" (2.5 cm)
AFTER RELEASE
1-1/4" (3.18 cm)
Trolley
Nut
Ring
Nut Ring
Nut Ring
Square End
Nut Ring Slots
Rail
Hole
USE ONLY THIS
TYPE AND SIZE
BOLT
Sprocket
Washered Bolt
5/16"-18x12"
