Chamberlain 3850 Connect Door Arm to Trolley, Figure, Figure, Figure, Figure 1:, Figure 2:, SECTIONAL DOORS ONLY, Figure 3, Hole alignment alternative:

INSTALLATION STEP 13

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 door) about 2" (5 cm) (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.

Inner Trolley

Outer Trolley

Clevis Pin

Ring5/16"x1" Fastener

Door

Bracket

Straight

Door Arm

• Fasten curved section to the door bracket in the

same way, using the 5/16"x1-1/4" clevis pin.

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.

Figure 1

Clevis Pin 5/16"x1-1/4"

Lock

Washers 5/16"

Curved Door Arm

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 23. Trolley will re- engage automatically when opener is operated.

HARDWARE SHOWN ACTUAL SIZE

Nut 5/16"-18 Lock Washer 5/16" Ring Fastener

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

Nuts	Emergency
5/16"-18	Emergency
	Release
	Handle

Bolts 5/16"-18x7/8"

Door Bracket

Figure 2

Lock

Washers 5/16"

Nuts 5/16"-18

Bolts 5/16"-18x7/8"

Cut This End

Figure 3