CH compressor shuts off before reaching set pressure?

by Jim MacDonald
(Miramichi NB Canada)

Campbell Hausfeld Compressor shuts off before reaching set pressure


I have a upright Campbell Hausfeld compressor Direct drive. It shuts off at 50 PSI. I changed the pressure switch and that didn't help. Is there a thermal shutoff that may be turning it off?
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Jim, pull the cover on the pressure switch. Run the compressor with the tank empty, and monitor the pressure switch to see if it trips at the 50 PSI mark, will you?

Since you don't indicate the model number, it's pretty hard to check and see if there is a thermal switch, though there likely is one.

But, if the pressure switch trips to off when the compressor stops, then it is still a pressure switch issue. If the pressure switch does not trip, and the motor stops, then power is likely still flowing to the motor circuit, and that surely suggests a switch on the motor or maybe a motor capacitor issue.

There is a page on this site about checking capacitors.

Cheers,

Bill

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Campbell Hausfeld VT558704 check valve bad?

by Sam
(Plainfield, IN, USA)

VT558704 parts drawing (courtesy of www.chpower.com)

VT558704 parts drawing (courtesy of www.chpower.com)

I believe the check valve is bad on our shop air compressor.

When the pump is off, the unloader valve is constantly releasing air.

I've tried to remove the check valve from the tank but the bottom of the valve is connected to something inside the tank so I can't remove the check valve to verify that it is the problem... any suggestions?
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I don't have any idea what the check valve would be attached to inside the compressor tank. As far as I know, it shouldn't be attached to anything?

If you visit the CH website here:

www.chpower.com/manualsearch/

...you can input the part number and download the manual and parts list.

I did so, and have added the section of the parts list relating to the check valve.

Item #20 is the check valve, and item #21 is the gasket that seals the check valve onto the manifold.

Once you have removed the air line from the check valve, the valve itself should screw right out of the manifold.

I ask anyone that has this type of compressor to comment, if they have successfully removed and replaced the check valve, to help Sam out.

Cheers,

Bill

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New WL651402 will not restart?

by j mankin
( letart, wva, usa)

WL651402 new CH compressor will not restart

will start and build pressure, but after use, will not restart to keep pressure up
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Please drain the tank completely and then try to start the compressor. Did it start?

If so, then I suspect an unloader valve problem. Please see the page on unloader valves on this site for more information about what they are and what they do, if you are not certain.

If the unloader valve is working, then please comment here with what happens, or does not happen, when you bleed the air from the tank below the normal cut in pressure. For example, does the pressure switch trip?

Also, see the troubleshooting section for guidance about why some air compressors will not restart.

Cheers,

Bill

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WL660700 air compressor cuts off at 35psi and won't start again

Hello I have an air compressor and it starts
Fine the first time but cuts off at 35psi and won't start again.

I bleed out all air and compressor never starts even if I turn off and Turn on power and 0 air pressure on tank.

Takes a few Minutes and than it starts again if power is turn off and on.

I had another compressor and borrowed the pressure switch swaped it thinking that was the problem Swaped switch is rated for 120psl cut out and 90psl restart but the Exact thing happened.

It is a used pressure switch which could also be bad but do you have any other theorys.?

The compressor is a campbell 30gal oilless belt driven single phase compressor model number WL660700
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Good that you tried another switch.

Since you seem pretty handy, why not dump all the air and use a multi-meter to determine if power is flowing through the pressure switch to the motor side.

Please post a comment here with your findings.

If the compressor stops at 35 PSI, and if power is not flowing to the motor circuit when the compressor stops, that means that the pressure switch has turned the power off. If the cut in is 120 and the cut out is 90 PSI, then power should flow to the motor until the cut out pressure is reached.

Bill

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