Insufficient output air pressure 90234 compressor?

by Greg
(San Antonio)

compressor with regulator removed and pressure switch cover off

compressor with regulator removed and pressure switch cover off

Hi Bill,


Re: insufficient output air pressure from Central Pneumatic 90234 compressor

I have a Central Pneumatic 90234 air compressor I got a couple of years ago from Harbor Freight. It has had light, occasional use, just a few hours total.

Lately I'm having a problem with what seems to be insufficient air output -- not enough to add air to a tire that has 26 PSI and not enough to run a long reach air scraper, also from Harbor Freight.

The compressor seems to run fine and both the main and regulator gauges show 100 PSI plus before the pressure switch shuts off the motor.

The ball valve shut off where you connect the hose is visually clear when open. I removed the regulator assembly to bypass it and still have no usable air output when the hose is connected directly to where the regulator normally screws in.

The hose is not obstructed and air output when sent thru a hand operated blower knozzle seems fairly strong, but obviously not enough to do most work needed. It looks like the problem may be somewhere in the main output/switch assembly.

Any troubleshooting ideas are appreciated.

Greg
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Greg, thanks for the photo.

I don't think your compressed air flow has anything to do with the pressure switch. Though it looks like the discharge line is coming off the switch, from my perspective it's actually coming off the switch manifold. Whether the pressure switch works or not (and based on what you wrote yours is) it should have not effect on the air flow from the compressor tank.

If that is the tank gauge I'm seeing in the photo, where is the regulator gauge? And for that matter, where is your regulator? I see the line coming off the switch manifold, but don't see the regulator at all.

Typically, the only thing between your air tool and the air in the compressor tank is the regulator and the discharge coupler.

From the photo it looks like you have the hose hard plumbed into the manifold, and there is no coupler, just the ball valve.

So, my guess that it is your regulator that is your compressed air flow problem, though I could be more sure if I could actually see the darn thing in your photo.

How about starting a new thread, include this photo, but also 2 or 3 more of the pressure switch area from all sides?

Cheers,

Bill

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Sep 25, 2013
HF 90234 very low air Pressure
by: Anonymous

My presure was escaping from the diapham between the presure switch and manifold. To locate remove the 4 small nuts on the top of the switch and expose. It had a large hole. Replace with high quality rubber roofing material or inner tube rubber. Works better than ever. Kicks on and off at 52 and 80 pound. Thanks
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Glad you resolved the issue. Thanks for updating us.

B.

Nov 29, 2012
Insufficient output air pressure 90234 compressor
by: Anonymous

Yes, Bill, air does come out with what seems to be moderate pressure, but it's not enough to run my air scraper or air up a tire. So it seems like partial blockage somewhere before the regulator. I went ahead and left it today at compressor repair shop for diagnosis.
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It would be helpful if you would post the findings here. Thanks much and good luck.
B.

Nov 29, 2012
Re: insufficient output air pressure from Central Pneumatic 90234 compressor
by: Greg

Thanks, Bill. As mentioned in the original post I removed the regulator to bypass it and see if that had any effect on the problem. That's when I took the photo I posted.

The problem seems to be the same with or without the regulator on, so I tentatively deduced that the regulator is probably not the problem.

The pressure switch seems to cut the motor off and on at appropriate pressure levels, above 100 PSI for cut off. You mentioned the manifold, which is integrated with the pressure switch assembly. I'm wondering if there is some valve in the manifold that's partly blocked (?)
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Shouldn't be, Greg.

If you remove the regulator, are you saying that the air does not flow out of the tank then? Through an open pipe?

If the air does flow out of the open pipe, then what is the next thing in the pipe from the tank?

Bill

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Need parts for model 90234 compressor?

by Tim
(Sparta, Tn)

Central Pneumatic compressor model 90234 (photo: hfreviews.com)

Central Pneumatic compressor model 90234 (photo: hfreviews.com)

I need a fan blade and housing cover for model 90234 ten gallon air compresser where can i find the parts that I need. Tim
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Ask your local Harbor Freight store where they send their air compressors for warranty repair. If the Harbor Freight store doesn't have the parts, perhaps their repair depot will.

Of course, you can call them directly for help, since your 90234 compressor does not seem to be current:

For technical product questions, please call 1-888-866-5797, Monday thru Friday, 6:00 am to 6:00 pm PST.

Cheers,

Bill



Bill

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Feb 26, 2014
90234 parts
by: dennis

i have all the parts anyone needs except for the piston or the rings. so if you need any just let me know and we can get it taken care of. you can get me at jusalitlprik@aol.com

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Model #36225 manual

by Jim Poulicek
(Georiga)

Can I get the manual for the 36225 unit. I can not locate the one I had.
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Hi Jim. Did you try Harbor Freight?

I haven't been provided a copy of this manual, so it isn't yet on the page for your download.

If someone has this manual and can forward it to me, I'll add it to the page.

Cheers,

Bill

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Aug 23, 2013
Reply of the 36225
by: Anonymous

Bill,
Thanks I will keep looking and someone has a manual for this unit. Jim P.

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what type of oil does it take?

Central Pneumatic pancake air compressor model # 95499
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Jennifer, in the absence of specifics about the compressor oil normally found in the manual, my advice is to visit your local store where they sell air compressors, and purchase COMPRESSOR LUBRICATING OIL.

Do not use automotive or other oils in your compressor. Compressor lubricating oil is designed for use in air compressors.

If your compressor is under warranty, use the oil they specify. If no longer under warranty, you should be good to go with compressor lubricating oil of any brand purchased from the compressor store.

Bill

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