Model # 139536251SR Official Craftsman 1/2-hp garage door opener

Here are the diagrams and repair parts for Official Craftsman 139536251SR 1/2-hp garage door opener, as well as links to manuals and error code tables, if available.

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Error Codes

Model diagram and schematic

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Showing 10 of 23 parts |

Opener assembly diagram

Garage door opener drive and worm gear kit (replaces 3002375, 65409)

Part #41A2817

The manufacturer no longer makes this part, and there's no substitute part

#14

Opener assembly diagram

Garage door opener limit switch

Part #41D3452

The manufacturer no longer makes this part, and there's no substitute part

Opener assembly diagram

Light socket

Part #175B88M

The manufacturer no longer makes this part, and there's no substitute part

#15

Opener assembly diagram

Sensor assembly

Part #41C4398

The manufacturer no longer makes this part, and there's no substitute part

#13

Opener assembly diagram

Garage door opener helical gear

Part #41A2818

The manufacturer no longer makes this part, and there's no substitute part

#10

Opener assembly diagram

Terminal block

Part #41A3150

The manufacturer no longer makes this part, and there's no substitute part

Opener assembly diagram

Line cord

Part #41B2991

The manufacturer no longer makes this part, and there's no substitute part

Opener assembly diagram

Gear & sproc

Part #41C4220

The manufacturer no longer makes this part, and there's no substitute part

#21

Opener assembly diagram

Tube

Part #206A65

The manufacturer no longer makes this part, and there's no substitute part

#20

Opener assembly diagram

Back panel

Part #41A3694

The manufacturer no longer makes this part, and there's no substitute part

Most common symptoms to help you fix your garage door openers

Choose a symptom to see related garage door opener repairs.

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Why does my garage door opener open and close by itself?

Main causes: neighbor's remote programmed at the same time as yours, faulty wall control wiring, bad wall control unit…

What preventive maintenance does my garage door opener need?

Things to do: check garage door travel, tighten brackets and fasteners, test safety sensors, check travel limits and for…

Why does my garage door opener reverse on its own?

Main causes: safety sensor beams blocked, safety sensors not aligned, downforce setting needs adjustment, damaged garage…

Why won't my garage door opener fully open or close the garage door?

Main causes: garage door opener misaligned, travel limits need adjustment, bad travel limit switches, faulty logic contr…

Why won't my garage door opener open the garage door?

Main causes: garage door locked, damaged garage door tracks, up-force setting needs adjustment, RPM sensor failure, bad …

Why is my garage door opener noisy?

Main causes: loose fasteners, broken brackets, need preventive maintenance, worn drive gears, loose or worn belt, loose …

Why doesn't my garage door opener work?

Main causes: faulty logic control board, bad RPM sensor, broken gears in the drive system, bad drive motor…

Why does my garage door opener work intermittently?

Main causes: radio interference, weak remote batteries, sunlight interference with safety sensor beams, safety sensors n…

Most common repair guides to help fix your garage door openers

These step-by-step repair guides will help you safely fix what’s broken on your garage door opener.

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How to replace a chain-drive garage door opener motor

Get your garage door moving again by replacing a defective motor in your garage door opener.…

Repair difficulty

Time required

60 minutes or less

How to replace a chain-drive garage door opener RPM sensor

Learn how to replace the RPM sensor if the door only moves 6 to 8 inches at a time and the LED light flashes 5 times. …

Repair difficulty

Time required

60 minutes or less

How to replace a chain-drive garage door opener drive and worm gears

If your garage door won’t move, the drive and worm gears could be broken. This guide will help you replace the gears.…

Repair difficulty

Time required

60 minutes or less

Effective articles & videos to help repair your garage door openers

Use the advice and tips in these articles and videos to get the most out of your garage door opener.

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Top questions about Sears and Sears PartsDirect

How to repair broken or damaged wires video

Learn how to repair broken, frayed or damaged wires in your appliances.…

How to open a garage door with an opener manually

Learn how to open a garage door manually if power to your garage door opener fails.…

Model # 139536251SR Official Craftsman 1/2-hp garage door opener

Model diagram and schematic

SEARCH WITHIN THIS MODEL

Most common symptoms to help you fix your garage door openers

Why does my garage door opener open and close by itself?

What preventive maintenance does my garage door opener need?

Why does my garage door opener reverse on its own?

Why won't my garage door opener fully open or close the garage door?

Why won't my garage door opener open the garage door?

Why is my garage door opener noisy?

Why doesn't my garage door opener work?

Why does my garage door opener work intermittently?

Most common repair guides to help fix your garage door openers

How to replace a chain-drive garage door opener motor

How to replace a chain-drive garage door opener RPM sensor

How to replace a chain-drive garage door opener drive and worm gears

Effective articles & videos to help repair your garage door openers

Top questions about Sears and Sears PartsDirect

How to repair broken or damaged wires video

How to open a garage door with an opener manually

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