Connect Door Arm to Trolley

INSTALLATION STEP 12

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) 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 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"

Figure 1	Inner Trolley
	Inner Trolley
	Outer Trolley

Clevis Pin

Ring5/16"x1"

Fastener

	Emergency
	Release
Door	Handle

Bracket	Straight
	Straight
	Door Arm
	Curved
Clevis Pin	Door Arm
Clevis Pin
5/16"x1-1/4"

Figure 2

Lock Washers 5/16"

Nuts 5/16"-18

Bolts 5/16"-18x7/8"

Door Bracket

Figure 3

		Lock
		Washers
		5/16"
	Nuts
	5/16"-18
		Bolts
		5/16"-18x7/8"
		Cut This End
Figure 4	CORRECT	INCORRECT
Figure 4
	Straight	Straight
	Door Arm	Door Arm

	Curved	Curved
	Door
(Groove		Door
	Arm
		Arm
facing out)

3255M 1/2 HP, 3245M 1/3 HP, 3255-2M 1/2 HP specifications

The Chamberlain 3255-2M, 3245M, and 3255M garage door openers stand out in the market for their reliability and superior performance. Each model offers a unique combination of power and features, catering to different needs and preferences.

The Chamberlain 3255-2M is a robust 1/2 HP opener designed for heavy residential garage doors. Its powerful motor ensures smooth and efficient operation, making it ideal for doors weighing up to 7 feet high. This model incorporates the latest in opening technology, including a durable chain drive mechanism that provides strength and longevity. One of its significant features is the incorporated MyQ technology, enabling users to control their garage door remotely through a smartphone app. This innovative feature brings convenience and peace of mind, as homeowners can check the status of the door from anywhere.

Another excellent choice is the Chamberlain 3245M, a 1/3 HP model that offers a balance of performance and affordability. It is suitable for lighter doors, providing consistent and reliable opening and closing. The 3245M model also boasts a protective cover that enhances its durability against the elements. It operates quietly thanks to its direct drive system, making it an excellent option for garages attached to living spaces. Like the 3255-2M, this model is also equipped with MyQ technology, allowing users to monitor and control their garage door from their smartphones seamlessly.

Finally, the Chamberlain 3255M, another 1/2 HP opener, offers similar features to the 3255-2M but with a focus on belt drive technology. This model is built for quieter performance, making it ideal for homes where noise is a concern. The belt drive reduces vibrations and sound, ensuring a smoother user experience. This model also comes with a battery backup system, which provides added security during power outages.

All these models emphasize safety and security, featuring auto-reverse functionality that senses obstacles and prevents the door from closing on them. The Chamberlain garage door openers are also equipped with a rolling code technology that changes the access code each time the remote is used, enhancing security against unauthorized access.

In summary, the Chamberlain 3255-2M, 3245M, and 3255M garage door openers cater to a variety of needs with their powerful motors, innovative technologies, and user-friendly features. Their reliability and performance make them an excellent investment for any homeowner.

Chamberlain 3255-2M 1/2 HP, 3245M 1/3 HP Connect Door Arm to Trolley, Sectional Doors only

Models: 3255M 1/2 HP 3245M 1/3 HP 3255-2M 1/2 HP

INSTALLATION STEP 12