LiftMaster 3280 3280 Manual - Page 6

Assembly Step 1, Assembly Step 2 - garage door opener

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ASSEMBLY STEP 1 Attach the 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 wasThheeCrehadmbbeorllatsin Gthroruopu, gInhc. the rail into the motor unitL.iftTmiagshtetreSnynbchoroltsDrisveecurely. Spring Trolley Nut Assembly Use only 3t/h5/e92s-e5/b16o/9lt2s-!5/U21s/9e2 -o6f/2a/9n2y other bolts will cause6/1s1e/9r2ious 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. USE ONLY THIS TYPE AND SIZE BOLT Washered Bolt 5/16"-18x1/2" Rail Hole Sprocket Rail Hole 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. Figure 1 Trolley Nut Ring Trolley Nut Ring Trolley Threaded Shaft Spring/Trolley Nut Square End Nut Ring Trolley Threaded Shaft Nut Ring Slots BEFORE 1" (2.5 cm) Figure 3 AFTER RELEASE 1-1/4" (3.18 cm) Figure 2 6

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6
ASSEMBLY STEP 1
Attach the 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.
• REMO
V
E 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 SERIOUSdamage 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 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
Nu
t
Ring
Trolley
Threaded
Shaft
Nu
t Ring
Slots
S
qu
are
End
Nut Ring
Trolley
Nut Ring
Trolley
1" (2.5 cm)
1-1/4" (3.18 cm)
BEFORE
AFTER RELEASE
Figure 1
Figure 2
Figure 3
USE ONLY THIS
TYPE AND SIZE
BOLT
Washered Bolt
5/16"-18x1/2"
Rail
Hole
Sprocket
Rail
Hole