ASSEMBLY STEP 2

Fasten the Rail to the Motor Unit

•Insert a 1/4"-20xl-3/4 bolt into the cover protection bolt hole on the back end of the rail as shown. Tighten securely with a 1/4"-20 lock nut Do NOTovertighten.

•Remove the two bolts from the top of the motor unit

•Place the "U" bracket, flat side down, on the motor unit and align the bracket holes with the bolt holes. Fasten with the previously removed bolts.

•Align the rail assembly with the top of the motor unit. Slide the rail end onto the "U" bracket, all the way to the stops that protrude on the top and sides of the bracket.

HARDWARE SHOWN ACTUAL SIZE

 

Lock

Nut

Bolt 1/4" 20xl 3/4 _

1/4"

20

ASSEMBLY STEP 3

Install the Idler Pulley

To avoid SERIOUSdamageto garagedoor opener, use ONLY those bolts/fasteners mounted in the top of the opener

Motor Unit

BoltsSprocket

"U" Bracket

Bott

I

Cover

Protection

Bott Hote

SLIDE RAIL TO STOPS

ON TOP AND SIDES

OF BRACKET

I

Lock Nut

•Lay the belt beside the rail, as shown. Grasp the end with the hooked trolley connector and pass approximately 12" (30 cm) of belt through the window. Keep the ribbed side toward the rail, and allow it to hang until Assembly Step 5.

•Remove the tape from the idler pulley. The inside center should be pre-greased. If dry, regrease to ensure proper operation.

•Place the idler pulley into the window as shown.

•Insert the idler bolt from the top through the rail and pulley. Tighten with a 3/8" lock washer and nut underneath the rail until the lock washer is compressed.

•Rotate the pulley to be sure it spins freely.

•Insert a 1/4"-20xl-3/4 bolt into the trolley stop hole in

the front of the rail as shown. Tighten securely with a 1/4"-20 lock nut.

Bolt

Lock Washer

3/8"

O

Trolley

Connector

HARDWARE SHOWN ACTUAL SIZE

Bolt 1/4" 20xl 3/4"

Lock Nut 1/4" 20

Nut 3/8"

Lock Washer 3/8"

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Sears 139.53915D owner manual Fasten the Rail to the Motor Unit, Install the Idler Pulley
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139.53915D specifications

The Sears 139.53915D is a significant addition to the lineup of garage door openers, blending both functionality and modern technology to enhance user convenience. This model is designed to accommodate residential garage doors, forming a reliable solution for homeowners who prioritize safety, security, and ease of use.

One of the standout features of the 139.53915D is its powerful motor, capable of handling heavy garage doors with ease. With its 1/2 horsepower motor, it ensures a smooth and swift opening and closing mechanism, allowing for quick access while still maintaining durability. This strength is particularly beneficial for larger or heavier doors that require more power for reliable operation.

The opener utilizes a chain drive system, renowned for its durability and strength. Chain drive systems are highly effective in providing reliable performance, making them a popular choice for various households. Despite this robust mechanism, the opener remains relatively quiet during operation, minimizing disruptions in the home environment.

A key characteristic of the Sears 139.53915D is its security features. It is equipped with rolling code technology, which generates a new code every time the remote control is used. This significantly enhances security by preventing unauthorized access and ensuring that only designated users can operate the garage door.

Additionally, the model features a safety reverse system, which automatically reverses the door's direction if it encounters an obstruction while closing. This not only protects vehicles and other possessions but also safeguards pets and children—an essential component for family households.

Installation of the Sears 139.53915D is designed to be straightforward, with comprehensive instructions that facilitate an efficient setup process. For those who prefer a seamless experience, the opener is compatible with several accessories, including smart home technologies. This compatibility allows users to integrate their garage door opener into a broader home automation system, providing added convenience and control through smartphone apps or smart devices.

In summary, the Sears 139.53915D garage door opener is a robust, reliable choice for homeowners seeking an efficient and secure opening mechanism. Its combination of a powerful motor, durable chain drive system, advanced security features, and ease of installation make it a formidable option in the market for garage door solutions.
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