I have two mastercoool unit atop the roof of my 3 year old house. These things are a constant problem. On one element, the pulley set screw keeps finance off, and when it is rotten, the pulley no longer turns the shaft. The other unit have a lot of mineral buildup within the water holes that nurture the cooling pads + on that section, it seems to get a lot of hubbub, like vibrate noises. Other part is quiet, when it runs. Belts are brand new and everything seems to be surrounded by order. I do interest on the noisy component, if you have one of the sheet metal panel off (to work on the inside mechanics) the element becomes stifled, so I assume it is a vibration of some sort on one of these panel. Ideas?
Answers:
To fix the set screw drill a small hole into the shaft and then put a unsullied larger set screw into that hole. If it still loosens use some locktite on the screw.
The vibration may be because the element was not installed without fault level.
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