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Craftsman 139.53978SRT owner manual Connect Door Arm to Trolley, RBok, Above holes

Models: 139.53978SRT

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Installation Step 12

Connect Door Arm to Trolley

Follow instructions which apply to your door type as illustrated below and on page 27.

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) for 8" minimum as shown below,

Figure 1:

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

•Fasten curved door arm to the door bracket in the same way, using the 5/16")( 1- I/4" c/evis pin.

Outer Trolley

levis Pin 5/16"x 1"

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.

I

i

I

i

 

 

 

 

Screws

 

 

Door Arm

 

5/16"-18x7/8"

 

 

 

 

ClevisPin

DoorArm

Figure 1

_rB_ok_

Figure2

5/16"x1-1/4"

 

 

 

 

 

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 cutend 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

 

©@o

 

 

Screws

Ring Fastenero

5/16"- 18x7/8"

Nut 5/16"-18

Lock Washer

5/16"

Figure 3

Clevis Pin

 

Clevis Pin

Hex Screw

 

5/16"xl" (Trolley)

5/16"x 1-1/4"

(Door Bracket )

5/16"-18x7/8"

 

Proceed to Adjustment

Step

1, page 28. Trolley will re-engage automatically

when the opener Is operated.

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Craftsman 139.53978SRT owner manual Connect Door Arm to Trolley, RBok, Above holes
Page 25 Page 27

139.53978SRT specifications

The Craftsman 139.53978SRT is an advanced garage door opener that combines reliability, performance, and ease of use. Designed to cater to the needs of modern homeowners, this model stands out with its robust features and technological innovations.

One of the key highlights of the Craftsman 139.53978SRT is its powerful motor, delivering a peak horsepower equivalent to ensure smooth and efficient operation. This allows it to effortlessly lift even the heaviest of garage doors, making it suitable for various types of residential garage doors. The quiet operation of this opener is another major advantage, allowing for a peaceful environment in and around the garage.

Another notable feature is the smart technology integration. The Craftsman 139.53978SRT is compatible with a range of smart home systems, allowing users to control their garage door remotely via a smartphone app. This feature not only adds convenience but also enhances security, as users can receive alerts and notifications about the status of their garage door, ensuring peace of mind.

Security is a priority with this model, which comes equipped with rolling code technology. This mechanism generates a new code each time the remote is used, preventing unauthorized access and ensuring that your garage remains secure from intruders. Additionally, the enhanced safety features include safety sensors that detect obstacles, automatically reversing the door's movement if something is detected, thereby preventing accidents.

Installation and setup are straightforward, thanks to the user-friendly design of the Craftsman 139.53978SRT. The unit includes detailed instructions and all necessary hardware for installation. Many users can set it up within a few hours without the need for professional assistance.

With a durable construction, the Craftsman 139.53978SRT is built to last. It has a sleek design that complements various home aesthetics while withstanding wear and tear from daily use. Maintenance is minimal, with easy access to essential components for servicing.

In summary, the Craftsman 139.53978SRT offers a perfect blend of power, technology, and security features. Its user-friendly design, combined with smart technology compatibility and robust safety measures, makes it an ideal choice for homeowners seeking a reliable garage door opener. Whether you’re looking to upgrade an old system or install a new one, this model is sure to meet your requirements and enhance the functionality of your garage.