Most problems that occur with cuckoo clocks are easy fixes that you can perform yourself. Below are the most common ones, with videos for troubleshooting your cuckoo clock.
Does your cuckoo stop ticking? Does it not keep time?
Is your cuckoo not cuckoo-ing?
Is the hour hand loose?
How to Properly Pack Your Clock for Shipping
It’s difficult to see this on this video, but it’s very important: Be sure to run the wire through four links (on a non-musical, six on a musical) of the chain, close to the bottom of the clock. It’s hard to see this most important detail in the video. That way you’ll catch both chains coming and going, so they can’t fall off the sprocket inside, necessitating a trip to the Clock Doc.
Also, catch the loop that the pendulum hangs on with the wire. That will keep it from banging around inside and possibly getting things out of whack.