model # ZJ3040SA will only run for a few seconds

by Kevin Burch
(Grinnell Iowa)

model # ZJ3040SA will only run for a few seconds then shut down.


The compressor will only run for a few seconds then shut down . I have to push the reset button to restart but does the same thing shuts down after a few seconds

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Jan 06, 2015
ty
by: Kevin Burch

No extension cord, don't know much about compressors but will check into capacitor ty

Jan 05, 2015
shutdown
by: Doug in s.d.ca

Have you checked the motor capacitor?

Do that first/next.

Or, if you're running an extension cord, get rid of that first.

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Piston rings for a ZJ3040SA?

by Denny
(Malvern AR)

I am trying to find the piston rings for JobSmart compressor and no one seems to have them.

The model number is ZJ3040SA

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May 16, 2015
piston rings and stuff
by: Doug in s.d.ca

Sucks. and Really Strange.

Maybe the piston MFR can point you in the right direction?

May 16, 2015
Ring set
by: Anonymous

I was able to order the piston--but they first back ordered the ring set then later said they could no longer get them and would not be available. So I am stuck with a compressor that cannot be repaired.

May 16, 2015
piston rings and stuff
by: Doug in s.d.ca

Yeah, weird.

Sub piston but no rings - have you asked if the piston comes with rings? I suspect so; they (hopefully) just forgot to mention it.

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Jobsmart ZJ3040SA trips the ground fault switch

by Richard Norford
(Harrisburg, PA)

Jobsmart ZJ3040SA air compressor

Jobsmart ZJ3040SA air compressor

This is pretty simple compressor I only use it to keep tire pressure correct and to blow off my lawn tractor and mowers.

The problem is it continues to trip the ground fault switches. I've plugged it into several. Other devices do not trip the switch.

The owner's manual tells what to check but I don't know what they are nor how to repair nor replace.

One additional issue or I think it's an issue is the model has 2 gauges. One of these seems to be allowing a leak. The compressor will build pressure and then the switch blows. I can hear air hissing and have identified the leak under one of the pressure gauges Is this normal and can it be one of the problems in making the switch trip.

Also can you tell me about the reset switch??

Thank you

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Oct 06, 2014
Compressor parts
by: Bill

Richard... each of the items that you ask about has a page of information on this site that describes what they are an how they work.

Go to the sitemap page and scroll down. You'll find all the pages listed there. Or, use the search box.

Oct 06, 2014
Tank Check Valve
by: Richard Norford

What is a tank check valve?

The owner's manual does not identify the parts and i have no idea how to identify the various parts your troubleshooting pages tell me to check out

unloader

Pressure switch

tank check valve

Is there a glossary or diagram I can view?


Oct 06, 2014
Would either of these cause the Ground Fault to trip.
by: Bill

Sorry Richard. I'm reading GFI and I'm thinking breaker.

Nope, neither of the unloader valve or tank check valve would normally cause a GFI to trip. The unloader valve failing may contribute to the compressor popping the breaker on start up.

Now, the tank check valve, please read the page on this item, it's important. If it's not working, then your compressor would leak all air out of the tank when it's off.

If the fitting into which the gauge is threaded is leaking (use a mild dish soap solution to check) then yes, you need to tighten the gauge to stop the leak. There is usually a wrench flat on the back of the gauge or on the gauge thread to be used to tighten or remove the gauge.

As to the GFI letting go, it's telling you that you've got a short to ground somewhere on the compressor, if the same thing happens when you plug the Jobsmart compressor into different GFI protected outlets. Changing the pressure switch would not, necessarily resolve that, but it might have, if the short was in the pressure switch.

That it's not (you put a new one on with no change in the GFI tripping) suggests that unless it's a short in the wiring to the pressure switch (a nicked power cord for example), or a failing ON/OFF switch, then the likely source for the fault is the motor.

Bill

Oct 06, 2014
Follow up question
by: Richard Norford

As suggested I went to your trouble shooting page, I'm not sure I know what the unloader nor the Pressure Switch.

The more important question is.....
Would either of these cause the Ground Fault to trip.

Where can I buy a replacement part for this unit?

and / or stop this model from running?

I can feel the air escaping from under one of the pressure gauges which I attempted to tighten?

The owner's manual is quite difficult to understand

Oct 06, 2014
Jobsmart ZJ3040SA trips the ground fault switch
by: Bill

Hi Richard... see the troubleshooting page about air compressors that blow breakers for some things to check.

First off, empty the tank and see if it starts without blowing the GFI socket. If so, ensure that the unloader works when it reaches cut out pressure.

You have "have identified the leak under one of the pressure gauges". Ok, what's under the gauge that is leaking. Is air coming out from where the gauge is threaded into the manifold. Is the gauge adjacent to something that's leaking.

Regardless, the first thing to do about a leak that occurs when the air compressor is off is to empty all the air with the compressor off, remove, and check the tank check valve.

Lots of info about these items on their pages on this site.

Add a comment here if you have a further question.

Cheers,

Bill

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