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Replace a broken gear and sprocket assembly with the manufacturer approved replacement part.
Garage door opener chain gear broke. Chain drive garage door openers have a sprocket that is attached at the top of the motor. A new garage door open start around 130 00 plus installation. I am not a professional. This is a video on how to change the gear sprockets in a craftsman garage door opener.
If i was doing it i would charges an 85 service call plus the 2 part. This was a craftsman model 139 53976srt. Roller chain rarely breaks. The gear will cost about 50 00 with shipping and then the cost of having someone install it.
This gives the appearance of a broken chain or belt. This is the part that connects the motor to the chain or belt. This can be easily replaced by a garage door service technician. The gear and sprocket assembly is inside the cover of the garage door opener motor.
If the chain is seriously old 20 or 30 years i would probably use a new chain. The chain got loose and popped off the gear. This garage door opener works by moving gears and metal parts together. Belt drive garage openers use a rubber belt to open the garage door.
Garage door openers. Follow the steps in this repair guide and video to replace the gear and sprocket assembly in craftsman chamberlain and liftmaster chain drive garage door openers. Like a chain drive the belt drive operates by moving the rubber belt. I hope this will help.
One of the most common repairs on a liftmaster garage door opener is a broken gear sprocket. Press all purpose grease into the recesses of the garage door opener s chain using the clean rag to force the grease into the chain s links. If the gear and sprocket assembly breaks the motor runs but the door won t move. Documenting how i repaired the garage door.
The most common cause of a chain being loose and appearing broken is a broken gear and sprocket. Work from the top of the garage door toward the opener s motor. It uses a chain running assembly unit attached to tension springs that lift the garage door up and down. After several years the garage door springs become weaker causing more stress on this particular part causing it to fail and wear out.
Over time the sprocket s teeth can wear and the chain may jump or skip when the opener raises the door.
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