68740 compressor keeps popping the reset

by Chris
(Columbia city )

Keeps popping the reset around 40 psi. Its a central pnumatic 68740

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Is the air compressor running a lot longer to get to the 40 PSI than it did before, Chris?

If so, you've got some issues with valve or gaskets I would guess, and because the compressor is not building pressure at its normal rate, the motor runs longer, and overheats.

If the compressor gets to the 40 PSI at about the same speed as before, and the motor is tripping off on thermal overload, that could indicate increasing back pressure is also increasing the motor load, making it work harder, and overheating. That could be a pump valve issue, a check valve blocking tank access, a mechanical issue with the pump operation, or a faulty run capacitor, to name just a few of the things that might cause this compressor problem.

Cheers,

Bill

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Central Pneumatic 92504 part number / name

by Dan Martin
(San Antonio, TX)

What's the nomenclature of this part

What's the nomenclature of this part

While installing a water trap onto my model 92504 Central Pneumatic 220 volt compressor, the fitting overtorqued and splayed the threads of the mounting that holds one of the two "air outlet" valves. This mounting is T shaped and runs air from the tank through the "Pressure adjustment knob" to two "air outlets." Also, the two (2) pressure gauges fit onto this, and the whole assembly sits under the "power switch."

Please see the attached diagram

The problem is that the manual and any online source does NOT have this part listed in the parts list. The diagram in the manual is poorly drawn and reproduced.

Can anyone tell me what the proper nomenclature is for this unit and the proper part number so I can order it.

I've had no luck contacting any of the "technical question phone numbers" or online part supplies to get this taken care of.

Thanks of any assistance.
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Dan, I downloaded the photo and blew it up, but I couldn't make out the part.

If it is, as I surmise, the manifold for the compressor, then I suspect you can cobble up another one with the same fittings sizes using brass fittings from a plumbing shop.

If I haven't zeroed in on the part, please start a new thread, and upload a close-up photo of the part in question, if you would.

Meantime, other visitors might see the photo you did upload here and comment.

Cheers,

Bill

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no presure build up

by herb
(mobile, al)

runs but will not build pressure
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Herb, there are a number of reasons why your Central Pneumatic air compressor keeps running but will not build pressure.

It could be the valves, gaskets, seals on the piston... like I say, many reasons.

Go to the troubleshooting section on the sitemap page for links to pages with more info on why air compressors won't build pressure.

Cheers,

Bill

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Central pneumatic air compressor stopping and kicking breaker?

by Dennis
(Stigler, ok)

I have a 2hp CP when air bleeds down to 80lbs. the pressure switch kicks in, but the motor only wants to turn a few revs. before stopping and kicking breaker ? The compressor motor runs fine from empty tank to fill @ 120 psi, but won't spin on bleed down?
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Hi Dennis. Do this check if you would, please.

Empty the tank to zero PSI, close the drain, and start the Central Pneumatic air compressor.

If the compressor starts normally, watch as the pressure builds. When the pressure in the tank reaches the cut out pressure level, the compressor should stop, and your unloader valve should then open and dump the air over the piston. The two happen at almost the same time.

If this does not happen, I suspect you need to fix the unloader valve as it isn't unloading the air. If this is the case, then on compressor restart, the motor cannot overcome the additional load of the air trapped over the piston, the motor tries and pulls too many amps, and blows the breaker.

Post a comment here as to what happened, K?

Cheers,

Bill

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