This was a craftsman model 139 53976srt.
Garage door opener drive gear replacement.
This is a video on how to change the gear sprockets in a craftsman garage door opener.
Shredded plastic gears are a common problem with chain driven garage door openers.
Replace a broken gear and sprocket assembly with the manufacturer approved replacement part.
Kipa pack 3 drive gear for sears crafsman liftmaster chamberlain garage door openers 1984 up 41a2817 41c4220a 81b0045 drive gear 32 teeth bore size 1 2 durable top quality 4 7 out of 5 stars 37 9 75 9.
See full descriptions for garage door opener compatibility by model numbers.
The teeth of the 41a2817 drive gear must be coated with a low temperature lithium based grease prior to operating your door opener or the gear will quickly shred.
The drive gear is designed as a sacrificial part and will shred when ever unusual stress or strain is placed on the door or opener.
Replacement gears and sprockets for genie model garage door openers.
Fortunately the repair is neither difficult nor expensive and it should only take an hour of your time.
Kipa pack 3 drive gear for sears crafsman liftmaster chamberlain garage door openers 1984 up 41a2817 41c4220a 81b0045 drive gear 32 teeth bore size 1 2 durable top quality 4 7 out of 5 stars 14 9 75 9.
If the gear and sprocket assembly breaks the motor runs but the door won t move.