Craftsman
Garage Door Opener

Model # 139664956 Official Craftsman garage door opener

Here are the diagrams and repair parts for Official Craftsman 139664956 garage door opener, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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ALL PARTS
Showing 10 of 96 parts  |

Lock Nut STD541425
#19

Rail assembly diagram

Lock nut

Part #STD541425

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

Lock Washer, 5/16-in, 8-pack STD551131
#25

Rail assembly diagram

Lock washer, 5/16-in, 8-pack

Part #STD551131

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

Master Link 4A1008
#15

Rail assembly diagram

Master link

Part #4A1008

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

Hex Head Bolt, 5/16-18 X 3/4-in, 5-pack STD523107
#23

Rail assembly diagram

Hex head bolt, 5/16-18 x 3/4-in, 5-pack

Part #STD523107

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

Cap Screw STD522507
#4

Chassis assembly diagram

Cap screw

Part #STD522507

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

Chassis Assembly 4A1258
#9

Chassis assembly diagram

Chassis assembly

Part #4A1258

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

Transmitter 6634
#5A

Radio controls diagram

Transmitter

Part #6634

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

Screw STD600803
#1

Chassis assembly diagram

Screw

Part #STD600803

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

Bearing Set 4A1420
#21

Chassis assembly diagram

Bearing set

Part #4A1420

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

Limit Lever 113C33
#36B

Chassis assembly diagram

Limit lever

Part #113C33

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.

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

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

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

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

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

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

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

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

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.

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

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 gear and sprocket assembly

How to replace a chain-drive garage door opener gear and sprocket assembly

Learn how to replace the gear and sprocket assembly on your garage door opener if the drive motor runs but the door won'…

Repair difficulty
Time required
 60 minutes or less
How to replace a garage door opener drive belt

How to replace a garage door opener drive belt

A damaged or broken belt on your garage door opener could be the reason it won’t move the door. Here’s how to fix it.…

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.

How to repair broken or damaged wires video

How to repair broken or damaged wires video

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

Garage door opener remotes won't work video

Garage door opener remotes won't work video

If your remotes don't work, you might need to disable the lock feature, eliminate RF interference or check the batteries…

How to use a multimeter to test electrical parts video

How to use a multimeter to test electrical parts video

Learn how to use a multimeter to check for wiring problems in an appliance that's not working…