At the point between the fan motor and the impeller a squeak has developed, and at times the lack of lubrication there has caused the motor to slow way down. Upon sliding the unit out, and manually moving the fan blade, I feel quite a resistance. I have managed to apply some WD-40 to the shaft at that location, but it doesn't last too long, and I have to re-apply the oil again. Is there a better way to apply lubrication to that particular point?
Never even think WD-40 is a lubricant oil! 3-in-1 in the black/white or red/white can won't work either, it will gum up and turn to varnish very quickly. 3-in-1 electric motor oil in blue/white can might work, but I won't risk it. Use SAE 20 or ISO 68 non-detergent oil ("turbine" oil, machine oil, compressor oil, hydraulic oil, are all OK, but "gear" oils are too sticky). "Zoom Spout" oil is OK, is a lot cheaper, but a little thin (SAE 10, ISO 32); this is not a bad thing, if you can't flush out the old gunk, a little thinner oil may even things out. Don't use engine oils, they are for cars.
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Brown is rust. Painted metal outside for 2 yrs eventually rusts (ergo: brown drips) The fan is exposed to heat/cold/wet and the sintered bronze bushings may have lost their lubrication and/or the shaft is corroded, causing squeaks. Take the case off and try to lube the shaft bearings with oil, not WD40.
Possible lack of lubrication or accumulation of dirt. It is best to remove panel and check for dirt, if so a good wash before lubrication of the FAN and moving parts must solve this issue. Use a degreasing spray like WD40 on the motor shaft and fan.
Several things besides lack of lubrication can cause the problem.
One or more of the fan blade irons may be loose. As well as the wooden blade itself. In both cases a Phillips screw driver will solve the problem.
The pull chains are clicking against the the fan. I've see this happen many times. Simply putting some tape around the chain, where it touches the fan, will generally silence it.
And last, but not least ... The fans may be out of balance. But, this may be due to loose screws in the fan blade irons.
As far as lubrication is concerned. Older unit (10 to 15 years) have sealed motors that were to be permanently lubricated. Even some of today's brands and models are too. At best, if none of the above silenced the ticking, is to use a little WD40 with a straw nozzle up into the fan housing. Be careful doing this as the WD40 may drip. Be sure the wall switch for each fan is OFF, before attempting this.
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The fan motor has bad motor bearings. After the motor has fun for a short amount of time, the bearings are getting so hot that they are physically swelling up and locking up the motor. This is due to poor/no motor lubrication. Some motors required lubrication with oil while some do not.
Replace the fan motor and run capacitor. After that, everything should return to normal.
you can do it your own without going to the technician spending money , actually the technician do is only to get the motor and they will send it to the machine shop for converting it to bearing from bushing, most of the aircon motor is bushing that's usually the cause of squeaking coz the bushing is out lubrication and worn-out already, using sealed and lubricated bearing you can achieved a longer life of a motor and is so quite also . anyway, by doing this all you have to do is to prepare your tools ,do it your own ,dismantle it in organize manner, then get the motor and disconnect all the wiring and be sure to put mark on it so that it will be easy for you to reassemble. the payments you spent is only for machine shop ,i'm sure if go to the technician it will put many job in a quotation and they charge you a lot.
I think your run capacitor for the blower motor needs replacing.
If it goes out the motor will not develop full speed and will shut off on it's internal thermal protector. When it cools off it will kick back in until it gets hot and shuts off again.
The motor may be dragging and have to be replaced, but I would try the capacitor first.
Post back with any questions.