Central Pneumatic 47065 no pressure

by Rudy
(Orland Hills IL)

I have a Central Pneumatic 47065 that I acquired second hand, but the prior owner never used it. I brought it home and fired it up. The first time the motor kicked on but I did not here that all familiar pump noise at first. It the pump then started to compress air on and off for a few seconds and then it went full out and filled the tank.


After finishing I drained the tank and put it away. 1 week later I went to use it and when I turned it on, the motor kicked on with the fan, however I never here the pump making that all familiar pump noise. It should be noted that the motor is a single shaft that turns the fan and the pump crankshaft. So I believe a motor issue can be ruled out.

I have read many threads about the potential of reed valve failure in this unit, but could that be what I am experiencing? Most people are saying they get some pressure like 25psi or 40psi, I get nothing after 10 minutes and it never sounds like the pump is compressing air.
____________________

Hey Rudy... good on you for reading some of the info on this site!

Question. You hear the motor run, you see the fan rotate, you feel the breeze, but you don't hear the pump run.

Can you see if the motor shaft is actually connected to the pump, or has the linkage let go? If the motor is running, the pump should be pumping (regardless of valve issues) and if the pump isn't running, I suspect a power train disconnect.

Questions? Comment here.

Cheers,

Bill

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May 30, 2015
Check air intake
by: AZBen

I found a used one on the side of my street and the only problems were with intake air blockage, the sponge was sucked into the hole and the valves were not functioning. Also the pressure switch was blown out at the diaphragm... which I made with a bicycle inner tube and scissors and a leather punch.

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47065 repair

by dave
(pass christian, MS)


I have a 47065 that my son knocked over...kids.

Motor still runs fine, and it builds pressure but I'm pretty sure the crankshaft case is cracked by the feet that attach it to the tank rails. It leaks all of the oil out eventually, especially when being used and making a big mess.

Being it is cast aluminum(?) should I even try to get it repaired? It sure looks like there are NO replacement parts available.

Or should I just buy a new compressor and use the old tank as storage?

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Jun 08, 2015
47065 for parts if any need for them/mostly good
by: Terry

Yeah,

I have one that I just happened to get in a swap deal and it needs a pressure switch I was told.
apparantly those are not available but if someone wants to buy this one for parts it is available on craigs list for sale. I do not need one this size and do not want to put money in it so there ya go.

Am about to list --Maybe someone can make a good one out of two Ha.

Terry

Apr 01, 2014
Parts available? If only...
by: dave

Thanks for the quick replies!

I have looked at the current models that are available at Harbor Freight...the crankcase on them is much smaller than the older version I have.

I will try to call and see if they have a replacement part...never tried - just started trying to find one the web. Keeping fingers crossed, while dialing phone.

Thanks again
dave

Mar 31, 2014
PDF manual
by: Rich Z

This link should get you the manual for your compressor with parts and a differant phone #. RCZ http://www.about-air-compressors.com/47065-repair.html

Mar 31, 2014
800 #
by: Rich Z.

Your compressor problem got me to go to harbor frieght. I knew I've seen that compressor before.they have 2 differant ones both seem the same,same price and look just like yours. Only the 1 Central Pneumatic - item#61454 if you click on it you can get a PDF manual. They show parts like the crankcase ect. Also the number 1-888-866-5797 for customer service. I would give them a call,if they can't sell you the part or its too $$$. buy a new complete unit. goodluck RCZ

Mar 31, 2014
crack
by: Doug in s.d.ca

If the leak/crack is just in the sump, not up to the cylinder, you might be able to stop that leak.

Failing that, you might be able to get a replacement pump to fit the motor.

Finally, if you use the tank for storage, you can probably get few bucks for the motor.

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pressure problem

by glenn
(gilmer texas)

i have a 21 gallon central pneumatic . i turn it on , it runs ten seconds then shuts off ,starts up again after 60 seconds building up pressure about 25 lbs at time. it take 30 minutes to build up to 125lbs . what could my problem be pleease help

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Apr 09, 2015
power
by: Doug in s.d.ca

Sounds like low voltage to it, possibly due to extension cord or bad circuit wiring to the plug if no extension. Try reading the voltage across the motor, or as close to it as you can. Less than about 110V while it's running would be a problem.

Failing that, maybe try another outlet. Is this a new machine, or have you had it a while?

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Keeps shutting down before desired pressure is achieved

by Carlos
(Corpus Christi Texas USA)

Central Pneumatic model 47065 air compressor

Central Pneumatic model 47065 air compressor

The compressor shuts off every minute or so never hitting 125 PSI. Tank pressure.

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Aug 20, 2014
Central Pneumatic Keeps shutting down
by: Bill

Hi Carlos...

Are you comfortable with how air compressor pressure switches work? If you aren't see the pressure switch page on this site for details.

If your 47065 keeps shutting down before the pressure in the tank reaches cut out, then you need to determine what is shutting the air compressor off.

If it is the pressure switch that is shutting off the 47065 before the tank pressure reaches the normal cut out, that would suggest that it's the pressure switch itself that is failing.

However, if the pressure switch is still tripped to on, and power should be passing through the switch to the motor circuit and it's not, then consider the power supply as the problem.

Another thing to consider is the motor overheating. As the load grows, the motor has to work harder to keep the pump pumping air into the tank.

If the motor is overheating - motor failing or a run capacitor failing - the motor may shut off on thermal cut out.

You need to try to determine what area on the air compressor is the problem to tackle the solution.

Add a comment here with your findings if you wish.

Bill

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