Here are some questions, answers, suggestions and comments about Central Pneumatic Model 94667 air compressors, beginning with the question about not enough pressure.
If you wish to comment or add you own question, there is a link to the CP Model 94667 compressor at the bottom of this page.
Need help with the stop switch why is it not building enough pressure....and wont stop on switch..had depot model for 10 years and this is nothing but problems...
Dear visitor... it likely is not your pressure switch that is at fault, since, in order for the switch to shut the compressor motor off, the pressure in the tank has to reach the cut out pressure.
I hope that you've had some good years out of it. Ten years seems a pretty good life for a compressor, assuming you haven't had a lot of service issues.
In any case, the typical reasons why an air compressor will run, and run, and run without building air pressure past a certain point are a valve (intake or pressure) failing, or an internal gasket letting go at the point where the compressor stops building pressure.
Why not see the Troubleshooting section on the site map page for links to pages with more details?
Question: WHERE CAN I BUY PARTS. I NEED A CHECK VALVE AND CANT GET TO ANY PLACE THAT SELLS THEM. THANKS
Response: Terry, the logical place to start is Harbor Freight, as this is their house brand. Failing that, you can use any tank check valve that fits the porting, and installs the same way, even if you have to cobble the air flow a bit. See a local compressor repair depot, not necessarily a big box store compressor department, for some pro advice on changing out your check valve assembly. Cheers, Bill
Question: i have an central pneumatic model #94667 21 gal upright. just over a year old,used just over a handfull of times. not ever been laid down,to my knowlage. a friend of my girlfriend came over and installed some new electrical outlets and moved the compressor to one of the furthest outlets that he installed. he is NOT an electrition....just a home owner. ok....problem,since the movement of the compressor,the tank air pressure has been dropping each time i need to sue it. THEIR ARE NO LEAKS. checked with spray bottle/soap.
the tank pressure won't climb past 40-42 psi and compressor runs constantly. getting alot of blow back from apears to be some kind of crank case filter on front of pump.....and alot of air from what looks like a muffler. have moved compressor back to original spot and used original outlet when it worked great. same problem. please help. thanks you Don "gasping for air" H.
Response: Don, from the sounds of it, your compressor may have developed a valve problem. Air blowing back out of the intake filter supports this. "getting alot of blow back from apears to be some kind of crank case filter on front of pump" this might be your oil fill port. It is vented, and if air is coming out of the vent, then you also have piston seal blow by. From what you've said, I don't think it was the moving of the compressor to a new power supply that is the issue, but it could be wear, and perhaps overheating wear at that. Cheers, Bill
Question: When my air compressor builds up air pressure it shuts the switch off. Can you please offer me any suggestions?
Response: I'd be happy to. First though, this is exactly how the air compressor is supposed to work. You turn your central pneumatic air compressor on, it fills the air tank with air pressure, when the pressure in the tank reaches the pressure switch cut out pressure level the compressor stops, and when you use air, the pressure drops, the compressor starts, and the cycle repeats. Since I do not know if this ... "When my air compressor builds up air pressure it shuts the switch off" ... is your compressor operating normally or not (you don't provide enough info) I cannot offer any more help. Please provide specifics... pressures, cut in and cut out... etc. Cheers, Bill