Originally Posted by
Gneux01
I would try that, but I don't know how get the cover off it. Whenever I try to unscrew it's screws, they simply snap off at the head. I could try with WD40 externally on the outside, see if that helps. Is it safe though, to use WD40 on it ?
The first place to apply the WD-40 is the screws, so you can remove them without damaging them. When you get them out, grease the threads before you replace them.
The motor internals may be rusting due to water getting inside them. When the motor overcomes the rust, the parts gradually polish themselves and run smoothly again, until the next rain when the cycle repeats itself. For the same reason, car brakes make a grinding noise the day after a rain. It stops when the rust has worn off.
Solution: Spray WD-40 inside the motor on all moving parts. Allow the WD-40 and any remaining water to evaporate. Then close the cover and apply clear silicone caulk to any potential gaps where water could enter.