Blower motor
#1
07-24-21, 04:33 PM
Blower motor
I have this combined A/C-heater unit. Fan motor started making screeching sound, I turned it off, climbed to attic, removed the cover and it did not spin freely. However, next morning when it wasn't that hot I went up there again and now it spins like it should. I'm wondering if I should replace the blower motor or maybe take it apart and use some oil on it? It does not look like there is some oiling/maintenance possible without disassembling.
Top Answer
07-24-21, 05:46 PM
Group Moderator
The screech is coming from the bearings. As the motor gets hotter the bearings seize tighter.
Most blower motors have sealed bearings and can't be lubricated.
You can try. Some people have claimed that they oiled them and the motor was fine.
The oiling is only a temporary repair. Ultimately the motor will need to be replaced.
Most blower motors have sealed bearings and can't be lubricated.
You can try. Some people have claimed that they oiled them and the motor was fine.
The oiling is only a temporary repair. Ultimately the motor will need to be replaced.
#2
07-24-21, 05:46 PM
Group Moderator
The screech is coming from the bearings. As the motor gets hotter the bearings seize tighter.
Most blower motors have sealed bearings and can't be lubricated.
You can try. Some people have claimed that they oiled them and the motor was fine.
The oiling is only a temporary repair. Ultimately the motor will need to be replaced.
Most blower motors have sealed bearings and can't be lubricated.
You can try. Some people have claimed that they oiled them and the motor was fine.
The oiling is only a temporary repair. Ultimately the motor will need to be replaced.
Bitjam,
Houston204
voted this post useful.
#4
07-24-21, 06:42 PM
Group Moderator
The motors aren't designed to be serviced. You could service it if you want.
You'd have to measure the bearings with a micrometer and then order them.
You'd have to measure the bearings with a micrometer and then order them.
#5
07-27-21, 06:52 AM
OK, I finally got the old one out, it is a 5KPC39NG-M646S. Couldn't find a replacement online and started educating myself. I've learned it is a 48 frame motor, which specifies the shaft and body diameter. I guess RPM and wattage are the parameters I need to match. However, there are motors marked as 3-speed and 4-speed. How the heck they switch the RPM in these motors? Can't find this information for my old motor, I think it is one speed ... ?
Edit: Ordered a Century DL1036, end of story. I hope.
Edit: Ordered a Century DL1036, end of story. I hope.
Last edited by Bitjam; 07-27-21 at 08:01 AM.
#6
07-27-21, 12:33 PM
Group Moderator
Multi speed motors have multi tap motor windings.
Make sure you order the correct capacitor for your new motor.
It will probably be different than the one you currently have.
Make sure you order the correct capacitor for your new motor.
It will probably be different than the one you currently have.
Last edited by PJmax; 08-10-21 at 10:50 AM. Reason: typo
#7
08-10-21, 03:21 AM
You can sometimes "buy your self a little time " for a motor that has bearings that are sealed and can't be lubed by using an ice pick or awl to tap a hole in the top of the metal sealed ring and dripping oil into the bearing. This does not always work but when it does it gives you time to order the correct replacement motor. I usually did this if the replacement motor was special order and/or a long delivery.
Trying to replace bearings in a motor yourself is as we say "a fools errand" (a waste of time). These motors are not made to be repaired. If this were some hard to get motor or a very special motor, then I would take it to a motor repair shop.
my 2 cents.
Trying to replace bearings in a motor yourself is as we say "a fools errand" (a waste of time). These motors are not made to be repaired. If this were some hard to get motor or a very special motor, then I would take it to a motor repair shop.
my 2 cents.
#8
08-10-21, 11:31 AM
I see you have not lived in socialism, I have. Shortage of everything, anything you can get your hands on is super expensive. Such a motor would be available only in the black market and would cost your moths pay. In socialism having a non-funct but repairable motor is a huge advantage over not having one. Since millennials seem to want to establish it here I'll put the old motor on the shelf, just in case they succeed.
The way old motor was connected didn't make sense. The "electrician" who connected it must have used trial and error method. The blue wire (medium speed) was connected to the common wire ... do I have to say more? The old motor never worked at full speed as a result. The new one does. I'm very pleased with increased airflow, the summer is hot here.
The way old motor was connected didn't make sense. The "electrician" who connected it must have used trial and error method. The blue wire (medium speed) was connected to the common wire ... do I have to say more? The old motor never worked at full speed as a result. The new one does. I'm very pleased with increased airflow, the summer is hot here.
#9
08-11-21, 04:17 AM
@Bitjam; You are right that I do not live under socialism yet. The only almost free country in the world is the USA. But don't fret because with the Senate, Congress, and President that we now have we will be a socialist country pretty soon. You can not print money as we are doing, then give it to those who won't work so they can "stay at home", pay people to pop out kids, and pay the unemployed extra money to stay home and keep your representative republic. WOW the road ahead looks bleak. Have a good day.
