Here you can surely find the answers to all your questions regarding garage door systems, components and their problems
Pulleys are major components of extension garage door spring systems and they may easily wear if their ball bearings get damaged. The pulleys could also split in two and, in this case, the garage door cable will stick. Consequently, damaged pulleys will cause the door to open partially and then stop or jam.
Every garage door opener has a force adjustment control and new doors are usually set with minimal force. For a well balanced door, the force setting should be minimal. Do not adjust the door to a high force setting especially if the door is not balanced correctly.
Garage doors can last at least 10 years. If you have been maintaining your garage door well by having it checked and tuned-up regularly, then it could last 20 years or even longer. You may check the manual to have a better expectation as garage doors and openers are built to last different lifespans.