67847 compressor won't built pressure?
Compressor parts - http://www.about-air-compressors.com
I have an older version of the central pneumatic 67847. It's a 21 gallon 3hp compressor.
I bought it used, and on the way home it rolled over. The oil fill cap came unscrewed and I found 2 parts laying on the ground. A little check ball about 1/4 of an inch and a little disc about 3/4 of an inch across with 3 tiny holes in it.
The compressor will not build pressure over 60 psi. Is it related to this check ball / disc? They had oil on them so I think they came out of the oil fill spout. I may have also lost more parts that I didn't see.
The compressor is not turning off at 60psi it just runs forever. With the switch off I do not hear any hissing from inside the compressor just a tiny hiss on the hose.
Eric, the items in the photo look like the venting for the oil fill cap. The check ball/disc may be just to allow air into the sump but to keep crap out. There is often a filter media in the cap to do that... you may have a more advanced cap.
No, I don't think the parts have to do with the fact that your air compressor will not build pressure past a certain point.
I have written, as have many, many visitors, about this issue.
Step one for me is to empty the air compressor, pull the intake filter, start the compressor and see if air is being pulled in or not. If air is being pulled in strongly, that suggests that the intake valve is fine.
On the troubleshooting page "compressor will not build pressure" are more checks. Please have a look at that page, review what you can, and post your findings here as a comment if you still need help after that.
Compressor keeps shutting off?
(Chippewa Falls, WI)
Air Compressor, Cast Iron Vertical, 2.5 Horsepower, 21 Gallon, 125 PSI (photo: www.harborfreight.com)
I have a Central Pneumatic 21gal compressor, bought new in fall used it a couple times.
It would never turn over in winter and now that it's warm out I tried it this weekend and it would run for 2 sec then shut off, sometimes it would run 15 sec and shut off, keeps popping the circuit breaker.
I drained the tank completely so there was no pumping resistance and same thing happened. Not sure if its the breaker or what?
Mike, the symptoms you wrote suggest that your Central Pneumatic compressor has a power supply issue.
If yours is the 2.5HP model running on a 120 Volt circuit, it will barely start with no issues given the power requirements of that motor.
The breaker would pop every time if the compressor was cold, as the thicker oil would add to the start load.
As far as the breaker goes, 20 AMP would be a lot better than 15 AMP for powering this compressor.
If you are using an extension cord, try plugging the compressor directly into the socket. Lose the extension cord. Any change? Please post a comment and let me know.
If not, then I suspect that it is not the breaker, but something in the start circuit. Start by checking the start capacitor. See that page on this site.
95386 - could it be another problem if it will not hold air?
Where can I purchase a pressure switch for model number 95386? I have tryed to find it on line with no sucess. Also could it be another problem if it will not hold air.
Sam, you can use another vendor's pressure switch, as long as you can connect it up the same way as yours is. Take yours off, take it to the parts store, and find one that is similar.
What makes you think your pressure switch is the compressor problem? Is it leaking air?
If the issue is a pressure switch leak, where is the leak coming from? Is it actually the switch, or is it the unloader valve?
Comment here and let us know if you would so we can help you nail down your air compressor problem.
67501 will not start?
Central Pneumatic air compressor 67501 (Photo: www.harborfreight.com)
I have a new CP67501 which ran fine out of the box. After a few minutes the pump will not start, only the cooling fan runs. Oil is at correct level. Out of Warranty - over 90 days. What can be the problem, please help.
Mitch, as far as I know about this model, the fan is attached to the motor shaft. The motor shaft is also attached to the drive mechanism for the pump.
It seems to me then that if your compressor fan is running, then the motor is running. If the motor is running the pump should be pumping.
If the compressor pump isn't, it is possible that the motor shaft has uncoupled from the pump. Can you check that and let us know what you found as a comment here?