Info on Champion Pneumatic Machinery Company Model OE 3860V

by Mike
(Newark, Ohio)

Champion Pneumatic Machinery Company Model OE 3

Champion Pneumatic Machinery Company Model OE 3

Champion Pneumatic Machinery Company Model OE 3
Champion Pneumatic Machinery Company Model OE 3
Champion Pneumatic Machinery Company Model OE 3 wire
Champion Pneumatic Machinery Company Model OE 3

I recently acquired a Champion Pneumatic Machinery Company (model OE 3860V) air compressor with what I think is a 60 gallon tank (which looks to be made of 1/4 inch steel - as judged by the overlapped seam at the bottom of the tank).


It runs fine and we have had it holding 175PSI (maybe...) for 24 hours.

Maybe - because the gauge reads 50 psi now that its empty.

I have replaced the gauge and pressurized it to 125 psi. Again - it seem to hold pressure well. I have a few concerns, and also want to learn as much about this AC as possible.

While sitting under pressure a small drop of water develops on the bottom of the tank about 2 inches from the bottom seam of the tank. It is not near anything, and is clearly not running there from another location.

While a water drop develops, it rarely drips. I believe it to be a pin hole.

I did drain the tank of about a gallon of water and probably a quart of oil.
Questions:

1. When under pressure, why wouldn't water be pushed out?

2. What are your recommendations on the pin hole in bottom of tank? Options being - repair or ignore until it gets worse; as is often the case, I'd rather not spend money on tank repair right now....

Other learning questions:

1. Where is PRV and how can I tell it is working properly? (see pictures for what I think it the PRV).

2. What is petcock on top of tank with tube that appears to go to the bottom of the tank?

3. Any idea where to get parts for pressure switch? (it works fine, but the wired attached to the contactor are very old and I'd like to replace them with new wire. Unfortunately, it does not look like I can detach the old wired from the spring contacts inside contactor without destroying things....)

4. A lot of oil in tank - is that normal?

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Aug 28, 2018
responses to Mike's
by: Doug in s.d.ca.

Other learning questions:
>>1. PRV

Mike replies: No pull ring or pin hole on this one; its probably original. No markings on working pressure. I did use pliers to test at 50psi. Works okay that way. I was really wondering how to tell if it will work as a PRV (ie when needed). Should I at least remove them and clean them up? (there are two - one on pressure controller, other on motor).

>>If you're right about the hole/leak, I think that will make for fairly unspectacular safety valve with no reset...

>>2. What is petcock on top of tank with tube that appears to go to the bottom of the tank?

Mike replies: I do not see how it could drain anything. My best guess - when tank pressurized, opening the petcock will result in air coming out (no need to drain tank) or water coming out (need to drain tank - or maybe no air and no water - which might also indicate need for draining???)

>>Oh - I was looking at pic 3. You're talking about first pic, sort of below the tank gauge? Maybe just for testing, as you suggest, but if it goes to the bottom of the inside of inside of the tank, then it's a drain. Is there another valve directly out of the bottom of the tank?

But that leaves me confused about pic 3...

Aug 28, 2018
Champion Pneumatic Machinery Company Model OE 3860V
by: Mike

1. Could be a rust flake over it that closes under pressure - maybe try lower pressure and see if it leaks more, if it is actually a leak.

Mike replies: Running test now at 50psi. Will advise.

2.Need to figure out if it is a leak - was there a lot of rust in the oil/water you drained?

Mike replies: Not a lot. No flakes or anything, but I have the usual 1/4 drain: I did poke a wire up inside to help drain (oil was thick - seemed to help - but no flakes came out).

My guess is still a pinhole. Near as I can tell - this AC is from 1937, and is original condition (and I'd like to keep it as close to original as possible). Despite its 1/4 plus inch wall - even that will rust out after 80+ years.
=========================
Other learning questions:
>>1. PRV

If you mean the thing sticking out to the left in the fourth pic, yeah. There should be a hole in the pin where there was a pull-ring. Pull it out and you should have lots of air come out. Push it back in to stop. Or, if you wait long enough, it may close on its own.

Mike replies: No pull ring or pin hole on this one; its probably original. No markings on working pressure. I did use pliers to test at 50psi. Works okay that way. I was really wondering how to tell if it will work as a PRV (ie when needed). Should I at least remove them and clean them up? (there are two - one on pressure controller, other on motor).
=======================
>>2. What is petcock on top of tank with tube that appears to go to the bottom of the tank?

Probably a drain extension, just to make it easy to drain - did you disconnect it?

Mike replies: I do not see how it could drain anything. My best guess - when tank pressurized, opening the petcock will result in air coming out (no need to drain tank) or water coming out (need to drain tank - or maybe no air and no water - which might also indicate need for draining???)


========================
>>3. Any idea where to get parts for pressure switch? (it works fine, but the wired attached to the contactor are very old and I'd like to replace them with new wire. Unfortunately, it does not look like I can detach the old wired from the spring contacts inside contactor without destroying things....)

Unless it's pretty big, no parts - just replace. But unless there's a danger of shorting/sparking, you can probably safely let it be.

Mike replies: Yeah mostly safe, although wiggling the wires can make it start/stop. I'll try cleaning up the connections first.

Also - I want to keep this AC original. I'll post another picture with info on the pressure switch (from a label on the inside of the switch - which is where I got the 1937 from; amazing it still intact and legible.
==========================
>>4. A lot of oil in tank - is that normal?

For a pump that's been overfilled with oil, or has bad rings, yes.

Mike replies: Quite possible. I am guessing it has never been rebuilt. I'll just consider it an inexpensive corrosion inhibitor for the time being.

Finally - HTH - thanks for replies - I rarely run out of questions.....
==================
Mike

Aug 27, 2018
Gee, is that all? Just kidding...
by: Doug in s.d.ca.

>>1. When under pressure, why wouldn't water be pushed out?

Could be a rust flake over it that closes under pressure - maybe try lower pressure and see if it leaks more, if it is actually a leak.
===================
>>2. What are your recommendations on the pin hole in bottom of tank? Options being - repair or ignore until it gets worse; as is often the case, I'd rather not spend money on tank repair right now....

Need to figure out if it is a leak - was there a lot of rust in the oil/water you drained?
=========================
Other learning questions:
>>1. Where is PRV and how can I tell it is working properly? (see pictures for what I think it the PRV).

If you mean the thing sticking out to the left in the fourth pic, yeah. There should be a hole in the pin where there was a pull-ring. Pull it out and you should have lots of air come out. Push it back in to stop. Or, if you wait long enough, it may close on its own.
=======================
>>2. What is petcock on top of tank with tube that appears to go to the bottom of the tank?

Probably a drain extension, just to make it easy to drain - did you disconnect it?
========================
>>3. Any idea where to get parts for pressure switch? (it works fine, but the wired attached to the contactor are very old and I'd like to replace them with new wire. Unfortunately, it does not look like I can detach the old wired from the spring contacts inside contactor without destroying things....)

Unless it's pretty big, no parts - just replace. But unless there's a danger of shorting/sparking, you can probably safely let it be.
==========================
>>4. A lot of oil in tank - is that normal?

For a pump that's been overfilled with oil, or has bad rings, yes.
===================

HTH.

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Champion Pneumatic Machinery Company Model OE 3860V

by Mike
(Newark, Ohio)

Pressure switch label

Pressure switch label

Picture of Pressure switch label.

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Aug 28, 2018
Penn Electric
by: Doug in s.d.ca.

I suppose you could try Johnson controls, but I doubt they'd have anything, being their old stuff is in the Smithsonian...

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