which condenser fan motor to buy?


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Old 08-23-16, 09:46 PM
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which condenser fan motor to buy?

here are some numbers i pulled off the old motor:

GE
3729
1075 RPM
7.5 370 CAP
2.30A
5kcp39LGS407S

should be the same as this:
http://www.drillspot.com/products/44...nser_fan_motor

so it's a 1-speed... do i need to replace it with a 1-speed???

I was looking at this:
https://www.amazon.com/Fasco-D7908-5.../dp/B007VJLJ5S

but it says 2.6A and not sure of the sizing either and other specs
 

Last edited by gecko316; 08-24-16 at 12:08 AM.
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Old 08-23-16, 10:08 PM
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The GE is 2.3-2.6A...... the Fasco is 2.6A..... that's ok.

Multi speed fan are usually more expensive.
The Fasco looks like a usable motor.
You may have to cut the mounting bolts and possibly the shaft.
 
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Old 08-23-16, 10:13 PM
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I would pick the first option since it is the same motor.

Amazon also has the same motor but it is more expensive...
https://www.amazon.com/Condenser-Fan.../dp/B009OVZPOW

I wouldn't pick that Fasco since I do not see the Frame listing of 48YZ.

Be sure to get the matching capacitor and remove the bottom drain plug on the new motor. I have seen motors fill up with enough rain water to short out in less than a year when the bottom drain plug isn't removed.

I recommend avoiding the impulse to use a hammer when removing the fan blade.
Clean and lubricate the motor shaft, remove the set screw, hold the shaft with an adjustable wrench and spin the blade off of the shaft.

 
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Old 08-23-16, 10:41 PM
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Amazon one I can get by Thursday

not sure how long the other one will take
 
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Old 08-23-16, 10:52 PM
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It looks like the Fasco is the faster option.
It has 4 holes drilled into the sides since it is a Rheem motor. I would cover those holes.

It looks like it is a 48 Frame motor. I like the Amp rating and it is reversible.

I haven't had to cut a motor shaft in years but those 4 bolts will probably need to be cut to allow the blade to sit close enough to the motor.
 
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Old 08-24-16, 12:03 AM
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I decided to get a GENTEQ 5KCP39LGS407S, paid $72 shipped. I expect it to arrive in a few days. Thanks for all the input, I'm sure I'll be back here to ask more questions, or at least give a (hopefully) positive update

also thanks for the tip on removing the drain plug on the downside of the motor (houston204)

I found this video since i wasn't really sure what a drain plug was, pretty obvious now though
https://www.youtube.com/watch?v=F9hgoDdU4a0
 
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Old 08-24-16, 09:53 PM
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Did you order a capacitor?
 
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Old 08-25-16, 08:31 PM
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yes I did, arrived today

fan motor arrives tomorrow

Did you order a capacitor?
 
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Old 08-25-16, 08:59 PM
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The cap was lighter so it traveled quicker.
 
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Old 08-26-16, 06:51 PM
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Stuck on removing the two (square) set screws from the old fan shaft

Update; Got them removed, now on to removing the fan
 

Last edited by gecko316; 08-26-16 at 08:27 PM.
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Old 08-26-16, 09:13 PM
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Liquid Wrench or PB Blaster. WD-40 will be useless.
 
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Old 08-26-16, 09:34 PM
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Using pb blaster, don't think I'm making much progress
 
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Old 08-26-16, 09:51 PM
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It can be frustrating. Don't hit the motor shaft with a hammer as that will round it over and the fan will never come off.

Did you try Houstons method.... remove the setscrew(s), hold the shaft with an adjustable wrench between the fan and the motor and twisting the blades on the shaft ?
 
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Old 08-26-16, 11:11 PM
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what do you mean twist the blades?

I've used a wrench and I can spin the fan back and forth... I keep adding the PB penetrating oil and am also sanding it

Doesn't want to come off

can only grip the shaft up top, since there's barely any room underneath the blade hub

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Last edited by gecko316; 08-27-16 at 12:56 AM.
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Old 08-27-16, 02:08 AM
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I just use WD40, emery cloth and a small wire brush. That blade looks like it will spin right off but a puller is only $29.00.

https://www.amazon.com/Supco-FBP100-...s=blade+puller

I probably use my puller in less than 1 of 20 motor replacements.

Grab the blade near the hub with one hand and spin the shaft back and forth with the other using an adjustable wrench while pulling the blade off.

Once the blade gets high enough, move the wrench under the blade.
 
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Old 08-28-16, 10:08 PM
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Moved the blade a fraction and can now fit a vise grip on the the under side of the hub

Can't move it anymore however, I will some Emery cloth I suppose

what about cutting the shaft?

I figure it might make more sense to buy a new blade vs the puller tool if they cost about the same
 
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Old 09-01-16, 03:52 PM
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Fan blade is off, the puller tool worked very well. A pro most likely didn't need to use it, but I did

Here's a beginner question, i need to cut the 4 threads down so that the fan doesn't hit them, what to use?

I have an angle grinder, a jigsaw and a coping saw (somewhere)
 
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Old 09-01-16, 06:40 PM
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Compounding front cutters work great for this purpose but that coping saw would work.
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Old 09-01-16, 07:29 PM
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Bought a hacksaw (couldn't find the coping saw), I pretty much wore out its teeth but got the results I needed

Unfortunately the new motor doesn't slip right in like the old one, the threads are ever so slightly spaced out further in diameter, so I can only get two of the four of them in

I suppose I could shave each of the four slots a little, not sure what to use there, I was thinking a drill, but that may be too drastic

I might just try some of that Emery cloth I bought....

Slowly but surely, I'm getting there
 
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Old 09-02-16, 02:58 PM
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Ok so I drilled four new holes and fitted the new motor, wires are too short

I plan on using the old wires and soldering them to the new wires with some heat shrink, is this going to be an issue since it's pretty high voltage stuff

Bummer that the new motor didn't just slip into place AND wires are far too short
 
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Old 09-02-16, 03:10 PM
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Many "sub" motors don't just slip right into place.

Soldering and shrinking the wiring is fine.
 
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Old 09-04-16, 10:12 PM
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All done, seems to be working fine... Much, much quieter now

One more question. The wires that allow the fan to operate in reverse, do I need to cover them with electrical tape, for weather proofing (uv) reasons?
 
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Old 09-04-16, 11:12 PM
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No but they must be secured out of the way of your fan blade.
 
 

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