Bostitch CAP2000P-OF pancake compressor will not pressurize beyond 60 psi

by Gary C.
(Stow, MA)

I have basicallly rebuilt the most common problems which cause this, but I must be missing something.


The piston ring was weak on the intake and compression stroke, so I replaced it.

I figured that the price for parts was reasonable, so I decided to purchase the reeds assembly and gaskets as well.

After replacing the above parts, I still have the same problem. I checked to make sure that I had good suction on the intake stroke, and good pressure on the compression stroke. They are both excellent.

However, the compressure will run forever and not go above 60 psi. There are no leaks, and it will remain at 60 psi for hours after shutting it down manually. I am stumped.
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Gary, it is unfortunate that you cannot check the gaskets when the compressor is assembled. Based on what you have written, I suspect that you have a crimped or broken gasket that is allowing air to flow back and forth inside the pump, without being pumped into the tank, and the breach occurs at the 60 PSI pressure level.

Cheers,

Bill

Comments for Bostitch CAP2000P-OF pancake compressor will not pressurize beyond 60 psi

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Jun 30, 2012
Solved
by: Gary C.

The problem was with the sending pipe. I had to use a piece of cardboard to block all of the air caused by the fan in order to find the problem. I found a leak around the slip nut at the check valve. The leak only showed up when the pressure got to 58 psi. To fix the problem - I had to cut the sending pipe shorter and replace the slip nuts and ferrils. I am happy to say that the compressor is working fine and back on the job.
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Good on you for tracking down that leak. Glad all is back on track.

B.

May 16, 2012
Re: Gaskets
by: Gary C.

Should I have used a gasket sealant when I assembled the reeds (valve plate assembly), head, and gaskets?

Here is a link to the parts diagram - www.ereplacementparts.com/bostitch-cap2000pof-air-compressor-parts-c-29443_29466_29471.html

I have replaced part numbers 55, 58, 59, & 60.
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Gary, I don't believe gasket sealer is in order. If the gaskets are letting go, it could be that they are not torqued evenly.

It just seems suspicious to me that the compressor runs and doesn't get past 60 PSI no mater how long it runs. That's typically a gasket or a valve issue, both of which you have already fixed.

As a WAG, check your intake filter too, to make sure that it isn't bogging down air intake.

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CAP2000 build pressure 100psi - keep running?

by donald
(houston)

Bostitch compressor build pressure 100psi an keep running
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Donald, the first check is to pull the intake filter, and then feel if air is being pulled into the intake filter port as the compressor is running.

There are more checks. Since there are a couple of pages of information linked from the Troubleshooting page that identify the typical reasons why an air compressor will stop building pressure, and to prevent the need for retyping everything on the existing pages here again, I would appreciate it if you would have a read, (see Troubleshooting on the site map page) and then comment here as to what your findings about your air compressor were.

That way, I know what you have checked, you will know what information is needed to better identify your compressor problem, and then I can help more specifically.

Thanks,

Bill

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