6
ASSEMBLY STEP 1

Attach the T-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 screws mounted in top
of motor unit.
•Align T-rail and styrofoam over sprocket. Cut tape
from T-rail, belt and styrofoam.
•REMOVE STYROFOAM.
•Insert both washered screws through the T-rail into
the motor unit. Tighten screws securely.
Use only these screws! Use of any other
screws will cause serious damage to door
opener.
•Position belt over the motor unit sprocket.
Styrofoam
Belt
T-Rail
Hole
Washered Screw
5/16"-18x1/2"
USE ONLY THIS
TYPE AND SIZE
SCREW
Washered Screw
5/16"-18x1/2"
T-Rail
Hole
Motor unit
Sprocket
T-Rail
Hole
To avoid serious damage to opener, ONLY use screws
mounted in top of motor unit.
WARNING
CAUTION
WARNING
WARNING
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 and brace it firmly 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.
Trolley
Threaded
Shaft
Spring/Trolley Nut
Nut
Ring
Trolley
Threaded
Shaft
Nut Ring
Slots
Square
End
Nut Ring Trolley Nut Ring
Trolley
1" 1-1/4"
BEFORE AFTER RELEASE
Figure 1
Figure 2
Figure 3