Craftsman air compressor will build 100lbs of pressure,but no more,& won't shut off

by Mike
(Illinois)

I have a Craftsman 5HP 60 gal. compressor.


The Compressor is able to build 100 lbs of pressure,but it can take 30-40 minutes from completely empty.

once it gets around 100 psi,that is where it stays even though the motor keeps running and compressor keeps pumping.(I guess attempting to pump would be more accurate),

I killed the breaker and let it sit for 48 hours and the pressure guage still reads 100 psi. I can turn on the power(breaker),and it runs but doesn't build anymore pressure, or ever shut off. Any info. would be greatly appreciated!
_______________
Mike, I moved this to the Craftsman compressor section.

I am surprised that you weren't able to get some direction from the page you originally posted this on, the compressor will not build pressure line.

While it is hard to determine what the compressor problem is, based on the hundreds of compressor owners that I've communicated with that have this same type of problem, typically it is caused by...

1) intake valve failing
2) gaskets leaking at a certain pressure
3) pressure valve failing

There could be other things involved too, but as I say, typically, these are the big three.

If you do the checks referred to on the page - whay air compressors will not build pressure - that will help you determine the cause.

I suspect, however, that you'll want to tear down the pump and replace the valve plate(s) and install new gaskets.

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 Craftsman Compressor Issues.

Model 919.167620 33 gal bursting hose

The plastic tube between the check valve and the pressure switch keeps bursting at the compression nut. Would like to know whats the issue
_____________________
I've had this one come up a few times anonymous visitor.

I suspect you are using your compressor for extended periods of time, that the tube in question - although higher heat protected - is still overheating a bit and that typically lowers the burst point.

It were my compressor I would replace this line with a copper tube (see your plumbing store for tube and fittings) and that should make the problem go away.

Why not use a copper tube when they build them? The cost to the manufacturer is greater, and not enough people complain to make the upgrade necessary, I would suspect.

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 Craftsman Compressor Issues.

Craftsman model 915310000 compressor won't shut off

by Eric Johanni
(Phoenix, AZ)

My Sears model 915310000 compressor turns on ok, fills tank to pressure ok, auto turns off for a few seconds and then runs again.

When it hits full you can hear air leaking which causes it to then turn back on a few seconds later.

However, if I unplug it when the tank is full, it holds pressure and I can use it until the tank needs filling again.

Turning off the power will not stop the air leaking, but unplugging will.

Basically I leave it turned on and have to plug it in to fill the tank, and then unplug it right when it is full, use it and then plug back in if I need more air.
___________________
Interesting air compressor problem, Eric.

Thanks for the complete report.

That you have to unplug the compressor to get it to keep air in the tank, and to stop it starting prematurely suggests to me that you have a pressure switch with an internal unloader, and the pressure switch is opening the unloader at the wrong time, and short cycling.

I tried to find details of your compressor model on line with no luck, so I couldn't confirm the type of pressure switch.

I believe if you dump all the air, remove and replace your pressure switch, that this compressor problem should be resolved.

Bill

Click here to post comments

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

Craftman Model 919.152812 6 hp

by Doug
(Youngstown, ohio)

The compressor was load.
I see that the Connecting Rods are very sloopy .062" to .125" clearance on the Pin, Eccentric.The bearing are not touching the pin.
Is this the wrong bearings on thr Rods?

Thanks,
Doug

Click here to post comments

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