47065 - Blowing the start capacitor?

I have the 47065 that so many people buy and seem to have trouble with.


Barely any hours on it and it began to trip the reset button.

Trying to get thru the job at hand, I kept resetting it and it blew one of the capacitors open on the end. I replaced it and after a slow start it blew open again on the first run.

My assumption is that maybe a check valve has gone bad allowing it to build up head pressure? Although I have looked at the parts replacement catalog and don't seem to see one in the system. Any other thoughts?
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It is possible that it is the check valve, though I suspect not.

Does the same problem occur when you try to start the compressor with the tank empty, or is the problem manifesting when there is back pressure from the tank?

Often a poor start or cap problem is worsened by a poor power supply, and that means no extension cords unless it is an industrial, heavy gauge one.

Is there any change in the power supply... and you are not using an extension cord I hope?

Please post more info as a comment here so I can help resolve this compressor problem with you.

Cheers,

Bill

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Aug 09, 2012
Blowing the start capacitor
by: Anonymous

No change in the power connection and no extension cord. It is plugged into a GFI protected outlet in the garage which has never tripped.

Starts right up empty but the last time it tripped it had probably 25lbs of tank pressure. I reset the trip button and it started slow, added a few more pounds then blew the capacitor.
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If I understand correctly, with no load on the motor (compressor tank empty) the compressor starts fine. You put about 25 PSI or more in the tank, and the compressor will not start.

Sure, pull - clean and replace the check valve though based on what you are saying, I suspect it may be an internal valve that is causing this.

Also make sure that the intake filter isn't a problem. In fact, try starting the compressor with the intake filter off, to see if that makes any difference.

If all of the above are OK, then I would look to the motor itself as being the problem.

Bill



If it

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5 hp will not build pressure over 110 psi?

5 HP Central Pneumatic compressor pump (Photo: www.harborfreight.com)

5 HP Central Pneumatic compressor pump (Photo: www.harborfreight.com)

5 hp central pneutmatics pump will not build pressure past 110psi and pumps very slowly up to that point.

It's single stage dual piston. Second piston has air coming out of intake, reed valve isn't broke or dirty. Only has 1 big reed valve. Does not seem to have any leaks in gaskets?

How do I check reed valve or do these has intake valves?
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If this is happening, "Second piston has air coming out of intake" then the valve is suspect. If you removed it and it looks good, then the fault is occurring under pressure.

Before doing anything else though, dump the air from the tank, and remove, clean, and replace the check valve that is located where the line from the pump enters the tank.

Please post a comment here as to results, so that we can dig deeper into your air compressor problem if necessary.

Cheers,

Bill

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47065 parts needed?

by Tony Pieras
(Statesville, NC. USA)

Central Pneumatic air compressor 47065

Central Pneumatic air compressor 47065

Central Pneumatic Air 47065 air filter and dipstick where can I buy?

I have a Central Pneumatic Air Compressor 47065 and I need a dipstick 14B , I lost mine and I also need a air filter 7A mine is broken.
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Tony, I can see from the photo that the oil fill cap and dip stick is a bit unusual, and I sympathize with you in trying to find a replacement.

Unless you can find a used Central Pneumatic 47065 air compressor, you may be out of luck getting an OEM replacement. See your local compressor shops for tips.

As to the air filter, if this were my compressor, I would open the filter housing, have a look at the filter media in it, and visit my local auto part store for an automotive filter that had a similar look, and one that could be cut to size to fit inside of the CP 47065 filter housing.

Cheers,

Bill

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I need a wiring diagram or picture of how the motor and capacitors are wired

by Daniel
(Mississippi)

I took the motor apart to replace a bearing and didn't think to take my own picture of how and where the wires were connected. I have the bearing on but now can't remember where each wire hooked on.
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Happy to post this for you. Please add a comment here with the model number of your Central Pneumatic air compressor so folks know the model and can, perhaps, help.

Or, contact Harbor Freight's help line - you still need the model number - and maybe they can help. "For technical product questions, please call 1-888-866-5797, Monday thru Friday, 6:00 am to 6:00 pm PST."

Cheers,

Bill

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