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-   -   Old Air Compressor Sparking (http://www.diychatroom.com/f2/old-air-compressor-sparking-167879/)

trs71 12-31-2012 02:24 PM

Old Air Compressor Sparking
 
Hi, I've got an old 220v 3hp 30 gallon compressor (PPH-30-110 Puma) about 25 years old. Bought it new, and has been working strong and used almost
daily.

The motor is sparking from what I think is called the "Centrifugal start switch". The contacts are gone. Any help on getting a replacement part or number?

I've got the manual here it's only got the air compressor break down, not the motor breakdown. Any help? I've looked and emailed puma with no response as of yet. It's a little 3x3 orthogonal thing. I can post a pic if needed, no part number on it I can see.

Thanks (I hope) -Tommy

danpik 12-31-2012 05:11 PM

Quote:

Originally Posted by trs71 (Post 1083395)
Hi, I've got an old 220v 3hp 30 gallon compressor (PPH-30-110 Puma) about 25 years old. Bought it new, and has been working strong and used almost
daily.

The motor is sparking from what I think is called the "Centrifugal start switch". The contacts are gone. Any help on getting a replacement part or number?

I've got the manual here it's only got the air compressor break down, not the motor breakdown. Any help? I've looked and emailed puma with no response as of yet. It's a little 3x3 orthogonal thing. I can post a pic if needed, no part number on it I can see.

Thanks (I hope) -Tommy

My guess would be to seek out a motor repair shop.

BTW I just had to look up Orthogonal...
1
a : intersecting or lying at right angles
b : having perpendicular slopes or tangents at the point of intersection <orthogonal curves>
2
: having a sum of products or an integral that is zero or sometimes one under specified conditions: as
a of real-valued functions : having the integral of the product of each pair of functions over a specific interval equal to zero
b of vectors : having the scalar product equal to zero
c of a square matrix : having the sum of products of corresponding elements in any two rows or any two columns equal to one if the rows or columns are the same and equal to zero otherwise : having a transpose with which the product equals the identity matrix

trs71 12-31-2012 05:13 PM

http://i226.photobucket.com/albums/d...psd2980840.jpg
http://i226.photobucket.com/albums/d...ps32d01cb5.jpg

Pics of part.

trs71 12-31-2012 05:15 PM

Stooopid spell check- orthogonal was supposed to be octagonal....ish.
:)

Guywithskills 01-04-2013 07:02 PM

Elect motors are relatively cheap now. I would not fix that old one... Likely other parts ready to fail. Go Grainger (a little pricey and still China built) or Harbor Freight cheap China built, ot Northern tool, med price China built. Just get a compressor rated motor. Also Remember to change oil in compressor unit, synthetic is best and doesn't take much.

Maintenance 6 01-07-2013 07:21 AM

Almost no cmpressor companies build their own motors. The majority use a variety of motors depending on who the supplier was for that particular production run. Could be GE, Westinghouse, Magnetek, yadda, yadda. Check for a data plate on the motor. It could get pricey to replace a 5-6 HP motor or greater for the sake of a $20.00 start switch.

JasperST 01-07-2013 09:29 AM

Why can't you just have someone weld up the contacts and dress them up?

Thurman 01-08-2013 08:53 PM

I have not seen one of those in years. They were available at a locally owned motor repair shop years ago, but who knows now? As far as "you just have someone weld up the contacts and dress them up?" It just doesn't work that way: Those contacts are copper covered with a silver plating. The copper makes a good conductor and the silver helps prevent "spark splatter". Try finding a local motor repair shop and ask if they have one or can get the centrifugal switch. The centrifugal switch keeps the power within the start capacitor to the motor until the motor reaches a certain speed, then the switch takes the capacitor out of the circuit.

DexterII 01-08-2013 09:06 PM

Interesting that you mentioned that Thurman, because the first thing that I thought was that Grainger has those, but decided that I would take a quick look first, and darned if they only have one particular one listed. I remember when it was fairly common to change them, but like you said, and after thinking about it, I haven't even looked at one in a long time. I wonder if maybe the supplied voltage is that much more stable now, or what might have changed. Anyway, trs, motor shops aren't as common as they used to be either, but you should be able find one someplace, and they will fix you up.

trs71 01-18-2013 06:10 PM

I can't find one locally, Torq.com has a replacement part S-6013 ($25-shipped). I ordered it and it is a different shape, but close. I have to modify it some, and I am not sure if it will work. I'll let you know if I get her going. I'm thinking maybe I should have just got a harbor freight motor...

http://www.torq.com/pdffiles/station...-arm-other.pdf

ps I guess it's called a "stationary switch"


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