Chamberlain 5100-2K Assemble the T-rail, & Attach the Cable Pulley Bracket

Assembly Section: Pages 8 – 11

To avoid installation difficulties, do not run the garage door opener until instructed to do so.

Assembly Step 1

Assemble the T-rail
Cable Pulley
& Attach the Cable Pulley Bracket
Bracket		Aligned
	Be

•Align the 4 T-rail sections on a flat surface exactly as shown. Center sections are interchangeable. Front and back sections are also interchangeable for ease of assembly.

•Insert the carriage bolts so the square bolt necks seat in the square holes in the T-rail sections and pass through the round holes in the rail braces.

Assemble lock nuts, ensure alignment and tighten.

If T-rail is not assembled exactly as shown, trolley will not travel smoothly along length of rail or it will hit against the nuts.

Cable pulley bracket
attaches to FRONT
END of T-rail	T-rail
	(End Section)

T-RAIL FRONT

(TO DOOR)

•Position the cable pulley bracket on the front end of the T-rail as shown. Fasten securely with the hardware shown.

Hex Screws

5/16"-18x7/8"

T-RAIL BACK (TO OPENER)

Square Carriage

Bolt Hole

1/4" Lock Nut	T-rail
	(End Section)

	Carriage Bolt
	1/4"-20x1/2"
T-rail
(Center Section)
	Make sure bolt
	necks are
	seated in the
	square holes
	and rails are
	aligned before
Right	you tighten lock
	nuts. (See right
	and wrong
	views).
	Improper
	assembly can
	cause jerky
	trolley
	operation, noise
Wrong	and/or nuisance
	door reversals.

Hardware Shown Actual Size

Wrong

Lock Nut	Carriage Bolts
1/4"-20	1/4"-20x1/2"

Hex Screw	Nut	Lock Washer
5/16"-18x7/8"	5/16"-18	5/16"

Cable Pulley

Bracket

Lock Washer

5/16"

			Aligned		When tightening
					the screws, be
		Be			sure to keep
Rail	Must				bracket parallel
					to the rail.
&
Bracket					Otherwise, the
					rail may bow
			Right	Wrong	when the opener
Nut					is operated.
5/16"

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