Compressor won't shut off on automatic

by Mike
(Fredericksburg, Va.)

With Switch set on automatic no matter what pressure I have the regulator set on the Campbell Hausfeld air compressor never cuts off until I manually turn it to the off position.....The compressor is a 20 gallon tank, 5.0 HP, 135 max. p.s.i.

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Sep 08, 2014
Compressor won't shut off
by: Bill

So, what you are saying is that the compressor keeps running, building the pressure up past the normal cut out point, and then the PRV lets go?

Or, that the compressor tank pressure never reaches the normal cut out pressure setting, so the compressor can never shut off?

If the former it's likely that you need a new pressure switch.

If the latter, see the troubleshooting section for the page about air compressors that won't build pressure past a certain point.

Cheers,

Bill

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WL-6701 wont shut off

by Alex Corbin
(KY)

1.Air compressor wont shut off. When I turn it on it builds up air , but it won't kick off or stop running.

2.The knob on the tank drain broke off. How can I go about getting a new knob and changing it out, or something.

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Sep 05, 2014
shut off
by: Doug in s.d.ca

1. What pressure does it build to?

2. Your local big box store or HFT has valves - pick one. Most likely you'll need 1/4 inch National Pipe Taper (NPT) which is about 3/8 inch in diameter.

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campbell hausfeld model no.wl651500aj not shutting off

by Gregorio Yanez
(Idaho Falls Idaho)

Campbell Hausfeld Pressure Switch 120-150 CW211400AV

Campbell Hausfeld Pressure Switch 120-150 CW211400AV

Compressor gets up to 175psi and air release valve will push loose and let air out causing the compressor to keep running.

how much psi is regular for the compressor to stop at? And what can I do?

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Oct 14, 2014
Pressure switch Campbell Hausfeld 120-150 CW211400AV
by: Bill

According to the specs I found, and the image I uploaded, your pressure switch has a cut in setting of 120 PSI and a cut out setting of 150 PSI.

If your compressor runs up past that pressure, to the point that the PRV lets go, that usually means that the pressure switch itself has failed.

If the one below is the same as yours you can get one there or at many compressor outlets.

Cheers,

Bill


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80 Gallon CH compressor runs fast/slow

by Blake
(Lehi, Utah, USA)

Campbell Hausfeld 80 gallon air compressor

Campbell Hausfeld 80 gallon air compressor

I've got an 80 gallon CH compressor that I've had for about six months. I've put probably 5-10 hours on it in that time and it has been running great. Output has been fantastic and no issues before now.

A couple of nights ago I had a session on my sandblaster where it was running frequently over the course of an hour or so. Towards the end I noticed a lot of condensation in the air and the flow seemed to be labored, but the compressor sounded like it was running fine. I finished up my project, emptied the moisture trap and tank drain and blew out the dust in the garage without issue (the compressor ran one more time).

Tonight I went out to start it up again and it seemed to start a bit slow, then sped up then slowed down again. This happened several times over about 30 seconds to a minute, so I shut it off. I tried to cycle it back on three or four times, however each time it did the same thing.

Additional info: the motor wasn't hot at all and no electrical smell, but the pump got hot quickly. The oil is used, but still clear enough to see the dot in the sight glass. I will change it in the AM & see if that helps, but I'm not hopeful. The unit is hard wired (wired directly into the power box on the house) and is the only thing on the circuit.

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Sep 22, 2014
Motor test
by: Doug in s.d.ca

Not much you can do as far as voltage without knowing the wiring.

Audibly, it should run steady and quiet. It may run up and down, and if it does that is a sure sign of cap or centrifugal switch problem.

It's possible it'll run fine, but you still have a cap related problem. You may find a loose or broken wire in the motor cap housing.

Sep 22, 2014
Thanks!
by: Blake

Agreed, thanks for the great help!!

I'm going to run the motor off-load today to see what I get. Should I be checking for a particular voltage output somewhere or just listen for the motor to speed up/slow down as it has under load?

I read the capacitor testing page and will try that later today as I get time as well.

Thanks again!

Sep 21, 2014
Thanks Doug & Buster
by: Bill

Hey guys, thanks for working on this for Blake and others. Your experienced input is very much appreciated by all.

Bill

Sep 20, 2014
capacitor?
by: Doug in s.d.ca

Then I think you should definitely check those motor caps and switch.

They should not be bad this early, but it sure sounds like something is off.

You can check the belt tension while you're at it. Probably a bit loose.


Sep 20, 2014
Sluggish motor
by: Buster

Hey Blake, I agree with Doug about running the motor with the belt off and see how it does, or bleed all the air from the tank and run it. Sounds like a motor problem. Let us know the results.

Buster in L.A. (Lower Arkansas)

Sep 20, 2014
Todays troubleshooting
by: Blake

Thanks Doug. I changed the oil today and it was dirty in the bottom, but didn't look bad IMO based on engine oil I've changed. It didn't smell burned or unusual either.

It did get a proper break-in and has been running great until now.

I refilled the oil with a synthetic blend compressor oil from Lowes and cleaned the intake filters as well. I also started it with the filters off to check the suction and both cylinders are pulling hard.

One thing I noticed: previously when it would start up it would chirp the belt as the motor kicked on. Now, it comes on at about 60% normal speed, then slowly winds up to about 80-90% normal and will then fluctuate between about 30% and 80% of normal (just guessing based on sound).

The auto shut-off is working and the tank is filling, just at a slower pace than it should.

Sep 20, 2014
Motor mystery?
by: Doug in s.d.ca

The compressor heat is likely normal, but you may wand to check the filter and check valve between the heads.

You're right about the oil, but good to change anyway (did you do a break-in when new?)

Possibly, the pressure switch is going bad (contact burn or the like).

See how the motor runs with no load, and maybe check the caps and centrifugal switch.

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