Contents

Page

A review of safety alert symbols

2

You'llneed tools

3

Safety information regarding garage door locks

 

and ropes

3

Testing your garage door for sticking, binding

 

and balance

3

Illustrationof sectional door installation

4

Illush'ationof one-piece door installation

5

Carton inventory

6

Hardware inventory

7

Assembly section - pages 8 - 11

 

Assemble the rail & install the trolley

8

Fasten the rail to the opener

9

Install the idler pulley

9

Install chain/cable & attach the sprocket cover

10

Tighten the chain

11

Installation section - pages 11 - 27

 

Installationsafety instructions

11

Determine header bracket location

 

Sectional door

12

One-piecedoor

13

Install the header bracket

14

Attach the rail to header bracket

15

Positionthe opener

16

Hang the opener

17

Install the door control

18

Contents

Page

Install the light and lens

19

Attach emergency release rope and handle

19

Electrical requiramemts

20

Safety reversing sensor information

21

Install the safety reversing sensor

22, 23

Fasten door bracket (sectional door)

24

Fasten door bracket (one-piece door)

25

Connect door arm to trolley (sectional door)

26

Connect door arm to trolley (one-piece door)

27

Adjustment section - pages 28 - 30

 

Travel limit adjustments

28

Force adjustments

29

Test the safety reversing sensor

30

Test the safety reverse system

30

Operation safety instructions

31

Care of your opener

31

Maintenance schedule

31

Operation of your opener

32

Receiver and remote control programming

33

Having a problem?

34, 35

Repair parts, rail assembly

36

Repair parts, installation

36

Repair parts, opener assembly

37

Accessories

38

Index

39

How to order repair parts

40

Warranty

40

Start by reviewing these important safety alert symbols

Mechanical

Electrical

When you see this Safety Symbol on the following pages, it will alert you to the possibility of damage to your garage door and/or the garage door opener if you do not comply with the corresponding

instructions. Read the instructions carefully.

This garage door opener is designed and tested to offer safe service provided it is installed, operated, maintained and tested in strict accordance with the safety instructions contained in this manual.

2

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Craftsman 139.53978SRT owner manual Start by reviewing these important safety alert symbols

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.