This video from sears partsdirect shows how to replace the chain and cable assembly on a chain drive garage door opener.
How to get garage door back on chain.
Observe which direction of rotation is down.
Close the door clamp it there or have someone hold it down.
In this case the cable can be replaced fixing the problem.
Place the roller back in the track.
Garage door opener is very strong and seldom does the chain actually break.
How do i get my garage door to reconnect after pulling the release cord.
Loosen the mounting plate and align the angle of the roller with the plate which requires you to open the door all the way and relieve the spring tension by disconnecting the opener.
This will release the door from the garage door opener.
How to put a chain back on an automatic garage door opener step 1.
Loosen the mounting plate without removing it.
Loosen the inside nut and back it off 6 8 turns back the outside nut off 5 6 turns this will give you some slack in the chain.
Press the wall control button or remote so that the opener completes its close cycle and the sprocket on.
The chain is attached to a threaded rod that is attached to the trolley.
Sometimes the cable will break if it is a combination chain and cable drive system.
Cycle the opener to the end of a down cycle.
Once you locate where the wheels on the door are jumping off the track snap locking pliers underneath the door on one.
Open the door manually.
Disconnect the garage door from the opener.
Disengage the garage door from the opener by pulling down on the emergency pull cord to release the door trolley.
Located along the rail the chain an.
The first thing to do is hit the door button.
Some units will actually reconnect themselves but this is not typically the case.