Bostich CAP60P-OF Won't build pressure past 50 PSI

by Derek
(Des Moines, IA)

I have done a lot of reading on this compressor; seems like a nightmare unit for the most part. Since I already own it, I might as well fix the darn thing.


This started with the valves in the head breaking, so I rebuilt the head with new gaskets, sleeve, ring and valves. Then the regulator developed a leak; replaced it. Now it runs and runs and won't build past 50 PSI.

I suspect an issue with the pressure switch. When I disconnect the small black tube from the check valve I get good pressure shooting out; as expected. When I close close off the outlet to the pressure switch it starts building pressure again.

Obviously it is dangerous to run without the pressure switch, so that is not an option. I am baffled by what is happening though; I thought the pressure switch only served as an upper limit shut-off?

Where do I go from here? Any suggestions?


Thanks.
Derek
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Sorry you're having so much problem with your Bostitch air compressor Derek.

Try this. Empty the tank with the compressor off then remove, clean and replace the tank check valve.

Reassemble and test. Any change?

Bill

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CAP 60P LOW AIR PRESSURE

by Leon Thorp
(Sayre, pa)

My CAP60P ran perfectly until the other day. Now it will not get above 20psi and motor continues to run.

Cannot find any air leaks except one place but not sure what the function of the Rilsan tube is.

It is blowing air where it enters the pressure switch and if I recall it has always done this so I suspect it may be some kind of safety device.

Compressors 4 years old and only has about 4 hrs use. It has held the 20 lbs of pressure in the tank now for 24 hrs.
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The Rilsan tube is a brand name flexible tube manufactured / supplied by mebraplastik.com .

On your compressor I suspect this tube runs between the line to the tank from the pump head and the pressure switch?

This is has leaked all along is a problem Leon.

If the air is blowing out of the unloader valve and not out of hole in the tube, then your tank check valve is leaking air out through the pressure switch, and that may have recently increased to the point where the compressor cannot overcome the leak.

If the air is actually blowing out of the tube itself, then I would surmise that the tube has failed.

First stop the air leak, and then, if the lack of pressure build continues, add a comment here, and read the troubleshooting section on the sitemap page about why air compressors run but don't build pressure.

Bill

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drain tap came loose and fell in tank

by Tellah Simon
(Lincoln Park, Mi usa)

My drain tap came loose and fell inside tank when I was releasing the pressure.

Can I buy a replacement drain tap at a hardware store? Or do I have to order online?

Are there any cheap fast fixes its Sunday and I need to be useing my compressor immediately please help thanks.....
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I must confess that I'm a bit confused about how a tank drain could fall into a tank, since they are typically found on the bottom of the lowest point of the compressor air tank.

Yes, if you find a brass fitting / valve that will fit the thread, you can use that.

Still, I wonder if you are talking about the tank drain... or what?

Bill

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Compressor will not shut off.

by Greg
(Panama, Florida)

I have a bostitch cap60p-of that will keep building pressure after 135 psi and wont shut off. I have to manually shut it off. What part do I need to order for it.
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The pressure switch is the device that turns the air compressor on at the cut in pressure level, and is supposed to shut your air compressor off at the cut out pressure level.

If the air compressor tank pressure exceeds the normal cut out setting of your air compressor pressure switch, then that suggests you need a new switch.

If the air pressure in the tank never gets to the normal cut out pressure setting of your pressure switch, see the sitemap page, look under troubleshooting, and see the page about why air compressors run on but do not build air pressure.

Bill

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