Central Pneumatic #40400 ~ what is causing oil leaking

by Angel
(Mesa, AZ)

Central Pneumatic #40400 oil leaking at cylinder head and regulator valve? Also starts on its own, came on and it was running about an hour..room full of smoke


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Bill says...

Angel, let's talk about the compressor starting on its own, first. If your Central Pneumatic air compressor is plugged in, then as soon as the air pressure in the tank falls to the normal cut in pressure of that compressor, the compressor will start.

That it started in your absence suggests that you were done with it, left it plugged in, and you've got an air leak somewhere that allows the tank pressure to bleed down to cut in.... and your air compressor started.

Normally it should run for a few minutes and then shut off on high pressure cut out. That yours didn't also suggests a significant leak or an open line somewhere.

As to the oil at the cylinder head, it sounds as though your piston seal(s) are worn out, oil from the sump is bypassing the seals, getting into the tank along with the compressed air, and blowing down the line to your regulator.

Oil coming out of the cylinder head (assuming it's the air intake port where the oil is coming from) suggests that your valves are scuppered, and air is blowing back out the intake, along with the oil.

Compressors run very hot, and oil leaking onto the outside of the pump head would, most likely, smoke.

Hope this helps,

Bill

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what to check on Central Pneumatic air compressor will only build to 50 lbs

by jimmmy
(georgetown ga)

will only build to 50 lbs air pressure
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Hello Jimmy...

That info is provided on a number of pages on this website.

See the sitemap page. Look under troubleshooting for links.

Cheers,

Bill

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repair center for model 40400 central pneumatic air compressor

by Bob
(canyon lake ca)

repair center for model 40400 central pneumatic air compressor

on/off pressure switch does not work
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Not quite sure what your question is, Bob.

If the pressure switch isn't working, then you need a new one. There are lots of after-market pressure switches that will fit your air compressor, some with ON/OFF switches, some without.

As long as you can mount the switch, connect it to the unloader, and get a new one with similar cut in and cut out and voltage ratings, you're good to go.

Bill

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Will operate but only up to 30 psi

by Sam Glover
(Orlando, Fl, USA)

Appears to build pressure up to 30 psi, therefore, can not add air to vehicle tires...pass 30 psi anyway. Any ideas?
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Hi Sam... lots of information missing here.

Tell you what. Look under Troubleshooting on the sitemap page first, then add a comment here with details of the compressor operation as it gets to 30 PSI, and we'll press on together to help you resolve this.

Cheers,

Bill

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