speedaire by dayton runs slow then eventually stops

by julius
(fort valley,ga)

model # 3z784, 2hp, phase(1)

stage (1)
ROT -- ccw
dayton electric motor -- 9k4578 -- capacitor start duty
2hp 3450rpm
115/230v - 60hz single phase

the compressor runs slow then eventually stops(about 20sec)
- oil level on line
- new belt, pressure switch

______________________
Bill says...

Julius, if the motor is fine, and lugging or running slowly, then it's likely that you're not getting enough voltage to it. A too long extension cord, too many other appliances pulling power from the same circuit... and so on.

If the power supply is good, then it's time to get the motor load tested.

Cheers,

Bill

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Speedaire.

Speedaire Compressor will not recharge

by Jorge
(Taylor, TX)

Hello,

I have a wheel barrow style Speedaire compressor. It is an oil less unit with a single piston.

The compressor builds up pressure and seemingly cuts off at the appropriate pressure; at least the pressure gauge indicates that (assuming it gives the correct readings). The problem is that when it reaches the low pressure mark the motor wants to start, I hear a humming noise from the motor and soon pops the breaker.

The compressor can re-start again if I bleed all the air out. That means I have to turn the switch off before it reaches the low pressure point, then bleed the air out and turn the compressor on to re-charge it.

I replaced the pressure switch and the check valve already and the problem persists.

Can you give me some guidance to get rid of the problem?

Thanks,

______________________
Bill says...

Hello Jorge. I think you've given me the tip I need to help you figure out what's going on.

You say that if you drain the air to empty, the compressor will restart, but if there is air in the tank, it cannot.

This suggests to me that you have an UNLOADER VALVE problem. Go to that page for details of what they are and how they work. I think you will find your answer there.

Cheers,

Bill

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Speedaire.

Broken valve plate Speedaire 8YJ20A BY DAYTON




This compressor sayd in the tank "Cast iron series" made in USA. My problem is that I have a broken plate that I supose is Call "valve" in some of the diagrams of other models, but none of them looks like this one.
The size of the square tin plate is about 2 1/2 x 2 1/2 inches, less than 1 1/16 thick and the purpose of the plate is to seal the intake hole when the piston is going up.
If any one knows what I`m talking about and want to help me I will apreciate it.
sonnyduque1958@hotmail.com

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Speedaire.