speedaire compressor pump 2z-499 only pumps to 80 psi

by clint
(overland park, kansas)

i recently acquired a 3z-323 compressor unit which has an apparently new(er) 2z-499 compressor.

other posts on this site call for a 1.5 or 2 hp motor... mine is only 1hp.

im unsure if my motor is bad because it only pumps to 80 psi(then stalls) or if the newer pump is rated for a larger horsepower motor. any help or advice is appreciated

clint

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Bill says...

Clint, I would be surprised if your motor is undersized for your pump, but I suppose it is possible.

In the absence of any other compressor issue, and I don't know what they may be as I don't have all the details about yours, if your motor stalls out at 80 PSI then I think either the pump cannot overcome the load going into the tank, or the motor hasn't got the oomph to compressor air past that point.

I would suspect that it might be a motor failing, as opposed to being under-sized. Perhaps your next step is to get a load test on the motor?

Cheers,

Bill






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speedaire compressor pump 2z-499 only pumps to 80 psi

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Aug 30, 2011
 alas problem solved
by: clint

sorry i took so long to get back. when i was originally trying to get the motor working it was 10 degrees F. i changed the oil to synthetic and this didnt help. finally i checked the voltage like you suggested and this was the key. the whole row of airplane hangars run a 20 amp breaker for all the lights. in the winter it is common to have engine heaters and space heaters on the same circuit which was significantly overloaded. using the door motor circuit which each hangar has a separate circuit allowed good power which made both motors to run like new..I like the speedaire compressor set up because it runs so much smoother than the cheap chineese units flooding the market.
thanks for all the advice.
clint
Jan 15, 2011
 2z-499 speedaire
by: Anonymous

I purchased a new 2 hp motor and it does not do any better. I wonder if the line from the pressure shut off switch to the motor is too small or somehow bad or if the compressor has a stuck valve . i removed a the pipe from the pump to the tank and it still overheats the motor it wont even pump to 40 psi now.

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The earlier suggestion was a load test on the motor, and that would have shown if the motor was at fault.

Since you have replaced the motor and problem persists, then it's not likely a motor related issue.

"I wonder if the line from the pressure shut off switch to the motor is too small"... isn't the issue, I don't think. That line is a sensor line, to feed the pressure switch with enough air to "sense" the system pressure so it "knows" when to turn on and off. That line doesn't have to be big as the amount of compressed air required for the switch to react is quite small.

Based on your further information, you now need to look at... yes, the valves, but also the mechanicals of the pump, as I feel that you may have a big problem there.

If a one HP motor gets the tank pressure to 80 PSI, and a 2 HP can only get that pressure up to 40 PSI now, something is changing in the pump, and it may be that the pump itself is failing.

Bill

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