central pheumatic by harbor tools regulator issue

by James
(Charleston,SC 29406)

i have a central pheumatic by harbor tools i had 2 years. I didn't know regulator was not working until my friend blew his boat tire up...i probably bought it broke and didn't know it . It is now didcontinued and no PARTS available.It is a 2 HP 8 Gal tank 2 gages one big i guess tank cause it cuts off when full and a smaller one ajustable to it both says 140psi and tank says max 114 psi can't seem to find the part can you help?

Thanks James jhsalter278@gmail.com

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Bill says....

Your compressor will likely have two gauges.

One is the tank gauge, which displays the pressure level of the air in the tank. It has nothing to do with turning the air compressor on and off. That function is provided by the pressure switch.

The second gauge, the one closest to the discharge coupling to which you connect your air line, should be the regulator gauge.

If you turn the knob on the regulator, that should adjust the downstream air pressure up or down, and the gauge is to show you what the downstream air pressure is set at.

If you rotate the knob for the regulator, that gauge reading should change. If it doesn't, it might be a failed gauge, or a failed regulator.

The regulator will be a common, general purpose one, and you will (should) be able to find a replacement at any shop that sells air compressor parts.

Pull the plug, dump all the air, and remove the existing regulator. Take it with you to the store so you can get one with the same ports sizes and regulator size.

Cheers,

Bill

Comments for central pheumatic by harbor tools regulator issue

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Oct 23, 2012
Hharbor Freight
by: SteveW

does anyone know where I can get the flapper valve and gaskets for a Central Pneumatics upright air compressor Mod# 94667

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Pressure regulator knob for model 94355

by franklin davis
(chattanooga ,tn usa)

where do i find a pressure regulator knob for this model #94355 air compressor
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Franklin, the logical first place is Harbor Freight, the folks that own the Central Pneumatic brand.

Failing that, visit any store that sells air compressors and they will normally also sell general purpose air regulators for those air compressors.

Since general purpose air regulators are pretty much all the same, as long as you get one that fits, you`re good.

Note that I didn`t say buy a knob. For the DIY home air compressor owner, finding parts for any of the compressor accessories is nigh unto impossible, and they just are not stocked in most stores. You probably will have to buy a new regulators.

Cheers,

Bill

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Update to Ray - Pa. (Central Pneumatic 3H.P. 3 Gal. #90385)

by Ray
(Pa.)

#90385 parts list

#90385 parts list

#90385 parts list
#90385 parts schematic

Update to Ray - Pa. (Central Pneumatic 3H.P. 3 Gal. #90385) After some reading on your site I did some further checking on the compressor.

Air intake at the filter is good!

And if hole in the oil plug is sealed, the compressor will fill tank, and cycle like it should.

The terms used for parts in most of the articles don't match up with parts listed in the assembly drawing for #90385. (I'll try to send a copy of the assembly drawing.)

Could it be the cylinder down washer that's the likely problem?
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Ray, I cannot connect this post to your original. There are just too many to do so.

If, in reading this post, your complaint is that air is blowing out the oil vent hole, then that is an indication of piston seals allowing air to blow by and into the oil sump instead of into the tank.

A pressure valve in the pump head, ad might the tank check valve, be forcing a back pressure situation which could increase the pressure on the piston seals.

I am sorry, by the time I blow up your parts list and parts schematic for the CP 90385 compressor, I can't read what it says. Old eyes, I guess.

Anyone else with a Central Pneumatic 90385 compressor with the same problems is sure invited to add a comment.

Cheers,

Bill


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