919.166440 does not supply any air?

by Thomas
(San Pedro, CA)

My craftsman air compressor model 919.166440 starts, runs but does not supply any air to the tank. I've removed, cleaned and replaced the check vavle. The safety valve is not stuck or is working properly. But still no air pressure. The regulator seems to be working. What could be the problem?

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Thomas, checking the check valve was a good first step.

Remove your intake filter, run the compressor, and feel if air is chuffing back out of the intake port. If so, your intake valve is suspect.

If air is not blowing out of the intake port, then, with the tank empty and the compressor off, remove the line from the pump head to the tank.

Start the compressor. If you can put your thumb or something over the pump port and air pressure does not blow your thumb away, then you have isolated the problem to the pump itself.

Any air blowing out the oil fill vent? That suggests that your piston rings are leaking.

Any of these work? How about an update as a comment here.

Thanks,

Bill

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Dec 27, 2012
No air pressure
by: Anonymous

Sears,DeVillbis compressor#919.16644(0) is an oil-less compressor and has no intake filter. The problem is more than likely a bad gasket,Reed valve plate, or piston ring seal.The gasket kit is # D30139, the piston/rod/seal is # N036518, reed valve plate is # N017592SV. The piston ring seal gets brittle and breaks. There by giving no compression. The reed plate can have stress cracks an the base of the reeds, causing leaks because the valves will not seal. For either repair the gasket kit will be needed. For the minor extra cost if replacing the piston/liner kit, I suggest changing the reed valve plate at that time. This is just my 2 cents worth.
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And we sure appreciate your .02 worth! :-)
B.

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Craftsmen does not build more than 20psi but still runs?

by Ben
(Denver, Co.)

Craftsman 3 gallon compressor (photo: www.sears.ca)

Craftsman 3 gallon compressor (photo: www.sears.ca)

I have a Craftsmen 3 gallon, 1.5hp compressor that will continually run but not build more than 20psi. did look at the flapper valve and nothing is wrong with it as you mentioned to check. Also checked the air intake and filter, both good. would appreciate any suggestions, thanks, Ben.
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Ben, I'm not quite sure what you mean by the flapper valve, unless you mean that you tore down the pump head and had a look at the intake and pressure valve plate?

The compressor pressure problem you are experiencing happens, as you say, at 20 PSI.

If the motor doesn't change speed or sound at that pressure, then it is likely not the compressor motor that is at fault.

What I suspect is happening is that either the valves (intake or pressure) are reacting to the back pressure and failing or you have a gasket leak inside the pump that lets go at 20 PSI and air simply circulates back and forth inside the pump and not into the compressor tank.

If you did tear the pump down, I'm afraid I would have to tear it down again, but not before I had a valve plate and gasket kit to replace the existing ones.

Cheers,

Bill

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craftsman 3 gal compressor

will only build to approx 40 psi. reed valve??

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Bill says...

In the absence of any real details of the operation of your Craftsman air compressor, the intake or pressure valves might be the issue, as might an internal gasket... or an open tank drain, or a poor power supply ... and so on. These are covered on the page.

When troubleshooting air compressors I always try to move from the obvious, lower cost potential problems, to the more expensive in both parts and labor, solutions.

Cheers,

Bill

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Craftsman Compressor Overheating

by Mark
(Ashland, VA)

This is a 6 HP, 60 gallon, twin cylinder, oil-free compressor (919.152812) purchased in 1996.

Has given many years of great service. No issues, not even when sandblasting.

Recently, has started to cut off with what seems to be an activation of a thermal overload protection. This occurs after cycling 10 or 12 times of coming back up to pressure as it is drained from running the sandblaster (I stop sandblasting every time the compressor comes on).

After waiting until the thermal protection circuit resets, the compressor will restart but compressor just doesn't sound right. It does not have that smooth normal sound; it has more of a pounding sensation.

The thermal overload protection will again trip the unit before it recovers back to 120 psi.

When I come back the next day, it's like nothing is wrong; until I use it for 30 or 40 minutes, sandblasting.

Last summer I was able to run the sandblaster nonstop until it was out of sand. The compressor would run constantly trying to keep up.

Any ideas of what may the causing the unit to overheat if that is what I am seeing? Or should I just say it has had a good life and look for a replacement?

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Bill says...

Mark, any changes in the voltage to the compressor? Added any other items in the same circuit that may be pulling power at the same time the compressor is running?

If not, I think it would be worthwhile for you to have the motor and capacitors checked. It may be only that the motor needs a rebuild or a capacitor changed out.

If not that, then I suspect a mechanical issue adding load to the motor, but I suspect that it there is no change in voltage that it may be the motor itself that's getting tired.

Good luck, and please keep us posted.

Cheers,

Bill

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