Chamberlain 1270LMC 用户手册

Assembly Step 1

Attach the T-rail to the Opener

To fasten rail, use only those screws mounted
in top of the opener. Failure to do so will cause
serious damage to the opener.

• Remove the two washered screws mounted in top

of opener.

• Align T-rail and styrofoam over opener sprocket.

• Cut tape from T-rail, belt and styrofoam.

• REMOVE STYROFOAM.

• Insert both washered screws through the T-rail into

the opener. Tighten both screws securely.

Remember to use only these screws! Any other
screws will cause serious damage to the opener.

• Position belt over the opener sprocket.

Washered Screw

5/16"-18x1/2"

Styrofoam

Belt

T-rail

Hole

USE ONLY THIS

TYPE AND SIZE

SCREW

T-rail

Hole

Opener

Sprocket

Belt

Washered Screw

5/16"-18x1/2"

T-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.

Do not overtighten.

• Insert a small screwdriver tip into one of the insert

slots of the nut ring, and hold firmly.

• Using an open end wrench at the square end,

slightly rotate the assembly clockwise until the nut
ring is released against the trolley, providing
tension for the best operation of the opener.

CAUTION

Assembly Section: Pages 6 – 7

Trolley

Threaded

Shaft

Spring

Trolley Nut

Nut

Ring

Trolley

Threaded Shaft

Screw-

driver

Nut Ring

Insert Slot

Square End

Trolley

Open End

Wrench

Trolley