pressure valve in head

by backstreet collision
(lodi,nj usa)

every once in a while the 75 psi pressure valve in the head seems to stick and pump simultaneously with the head.valve was changed once and i was wondering if maybe there was another problem.thank you


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Bill says...

backstreet collision, is this a twin cylinder air compressor? If so, look to the intake valve on the second cylinder as a possible source for the problem. If it sticks, the line from the first cylinder becomes over-pressurized, and the PRV in the line lets go.

If not this, or not right issue, please provide more details about your air compressor problem.

Cheers,

Bill

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Motor lags and blows fuse...

by Eric
(Kernersville, NC)

I have a 1 1/2 hp speedaire that won't start before blowing a fuse...The motor has just been rebuilt...From a zero pressure in the tank it starts and does fine but when there is pressure in the tank the motor lags and then blows a fuse.I can hear the unloader release air after after it shuts off...if I take the fitting off the line that runs to the unloader, the motor starts fine..I'm lost...could it be the tank check valve?..
thanks for your time..
Eric

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Bill says...

Eric, good that you checked the UNLOADER VALVE, as that is the first place I look when this happens.

Yes, sure, re & re the check valve to make sure it's clean and working properly.

When a compressor is unable to start against load, and the mechanical part of it is OK, then I would next look to make sure that you have clean power to the compressor, and if you do, then I'd look next to the start capacitor.

There is info on this site about how to test capacitors.

Cheers,

Bill

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Need a parts list for a Speedaire Model # 3Z423F compressor

by Tom
(Balto, MD)

I need to find a parts breakdown/list for an speedaire compressor single stage model # 3Z423F.Thanks, Tom M.

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Bill says...

Tom, I'm happy to post this in case someone has one. Have you tried to contact Grainger about getting a manual from them?

Cheers,

Bill

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speedaire copressor modle 3z395d blows the breaker

by alen
(tx)

Every time I start it and its normal its on auto so it stops after it feels up but when it starts up again it blows the breaker I can't figure out what the problem is.

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Bill says...

Alen, the breaker is popping either because the compressor is pulling too many amps or there are too many appliances pulling power from the same circuit at the same time, and there isn't enough to go around.

Drain the tank to zero PSI with the compressor off. Start the compressor after closing the tank drain.

Does it start OK? If so, the motor may be pulling too many amps as it is trying to start against pressure on the piston when there is pressure in the tank.

If this is the case, then look to the UNLOADER VALVE. Make sure that the unloader is working properly. Post more details here is you wish.

Cheers,

Bill

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Suitability of this Speedaire compressor

by Jerry Barrick
(Carlisle, PA)

I have a NEW Model 52702A twin pump Speedaire compressor with twin Baldor 3HP/3PH motors that I got at a VERY GOOD price.

I know it was for heating and air conditioning applications and was to run from 70-90 PSI.

Can I modify the settings for it to run 125-150 PSI without problems in my home shop?

I realize the unit is overkill for a home shop, but I run a sand blaster, paint sprayer, air tools, etc and it should last forever the way I use it.

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Bill says...

Jerry, all I can say for sure is that if the air compressor was built to run at 125-150 PSI, the pressure switch would have been factory preset at that pressure level.

I tried to find information about the Speedaire Model 52702A air compressor with no success.

If you are prepared to take a risk, then reset the cut out pressure at your 125 PSI. You may find that the PRV lets go before you reach that level, and using it at the higher pressure may shorten the life expectancy.

Did you think to ask Grainger?

Cheers,

Bill

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