Chamberlain CG40DM Connect Door Arm to Trolley, Figure 1:, Figure 2:, SECTIONAL DOORS ONLY, Figure 3, Hole alignment alternative:

INSTALLATION STEP 12

Connect Door Arm to Trolley

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

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 pulley) about 8" (20 cm) as shown in Figures 1, 2 and 3.

Figure 1:

•Fasten straight door arm section to outer trolley with the 5/16"x1" clevis pin. Secure the connection with a ring fastener.

•Fasten curved section to the door bracket in the same way, using the 5/16"x1-1/4" clevis pin.

IMPORTANT: The groove on the straight door arm MUST face away from the curved door arm (Figure 4).

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.

Figure 3, Hole alignment alternative:

•If holes in curved arm are above holes in straight arm, disconnect straight arm. Cut about 6" (15 cm) 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 bolts, lock washers and nuts.

Pull the emergency release handle toward the opener at a 45° angle so that the trolley release arm is horizontal. Proceed to Adjustment Step 1, page 27. Trolley will re-engage automatically when opener is operated.

HARDWARE SHOWN ACTUAL SIZE

Nut 5/16"-18	Ring Fastener
Clevis Pin
5/16"x1-1/4" (Door Bracket)		Lock Washer 5/16"
Clevis Pin		Hex Bolt
5/16"x1" (Trolley)		5/16"-18x7/8"

Pulley
8" (20 cm) min.
Trolley		Outer Trolley
Stop Bolt
	Inner
Ring		Clevis Pin
	Trolley
Fastener		5/16”x1”
		Emergency
Door		Release Handle
Bracket
		Straight Door Arm
Clevis Pin	Curved Door Arm
5/16"x1-1/4"
Figure 1
Pulley
8" (20 cm) min.

Trolley

Stop Bolt Lock Washers 5/16"

Nuts 5/16"-18

Bolts 5/16"-18x7/8"

		Door
Figure 2		Bracket
Pulley
		8" (20 cm) min.
	Trolley
	Stop Bolt		Lock
	Nuts		Washers
			5/16"
	5/16"-18

		Bolts 5/16"-18x7/8"
Figure 3	Cut this end
CORRECT		INCORRECT
Straight		Straight
Door Arm
		Door Arm
(Groove	Curved	Curved
	Door	Door
facing out)	Arm	Arm

Figure 4

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