Our other tech went on a no cool call and found the condenser fan motor was bad and replaced it with one of truck stock motors. We use Top-Tech motors, a universal replacement sold by the local parts house. We have never had any problems with them, and on this particular replacement the fan shook pretty bad. The homeowner called back and the tech was sent back out, he said he couldn't figure what was wrong and left (did that a lot). They send me out and the customer said, insistently, the the other tech bent the fan blade. I called the owner and told him the whole story, asked if I could swap motors to make sure the new one wasn't defective as the blade looked OK and still had the weights on it. The boss said to just order a new fan blade. Went back out the next day with the new blade and swapped it out, fan still shaking pretty bad. Went ahead and swapped the motor out for another Top-Tech of the same size and RPM, which matched the data plate and still had bad wobble. We ordered a factory spec replacement motor, and installed it and wobble went away. This was a carrier package unit. My question is this. Is it possible that carrier is some how counterbalancing their motors and fan blades so you can only use their parts or is it more likely we had 2 bad NIB replacement motors? Run one of the motors with no blade and it had no wobble.