Chamberlain 1280 - 1/2 HP Connect Door Arm to Trolley, Figure, Figure, Figure, SECTIONAL Doors Only, Hole Alignment Alternative

Installation Step 12

Connect Door Arm to Trolley

Follow instructions which apply to your door type as illustrated below and on page 23.

SECTIONAL Doors Only

Make sure garage door is fully closed. Pull the emergency release handle to disconnect the outer trolley from the inner trolley. Slide the outer trolley back (away from the door) about 2" as shown in Figures 1-3.

Figure 1:

•Fasten straight door arm section to outer trolley with a clevis pin. Secure the connection with a ring fastener.

•Fasten curved section to the door bracket in the same way as shown.

Figure 2:

•Bring arm sections together. Find two pairs of holes that line up and join sections. Select holes as far apart as possible to increase door arm rigidity.

	Inner Trolley
	Outer Trolley
		Lock
		Washers	Rope
		5/16"
		Clevis
	Ring	Pin
	Fastener
		Nuts	Manual
			Release
		5/16"-18	Handle
	Door	Straight	Screws
	Bracket
		Door Arm	5/16"-18x7/8"
		Door Bracket
Clevis Pin	Curved	Figure 1	Figure 2
	Door Arm

Hole Alignment Alternative

Figure 3:

•If holes in curved arm are above holes in straight arm, disconnect straight arm. Cut about 6" from the solid end. Reconnect to trolley with cut end down as shown.

•Bring arm sections together.

•Find two pairs of holes that line up and join with screws, lock washers and nuts.

Hardware Shown Actual Size

Nut 5/16" - 18			Lockwasher 5/16"	Ring Fastener
		Hex Screw		Clevis Pin
	5/16"- 18 x 7/8"			5/16" x 1"

Lock

Washers

5/16"

Nuts

5/16"-18

Screws

5/16"-18x7/8"

Cut This End Figure 3

Proceed to Adjustment Step 1, page 24. Trolley will re-engage automatically when the opener is operated.

22