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by tom wilhelm
(pataskala ohio)

It’s a 50 second cycle to build 120 to 150 psi and low cfm. 7.5 hp 80 gal 2 stage pump?

New Campbell Hausfeld 7.5 HP compressor with vertical tank
New Campbell Hausfeld 7.5 HP compressor with vertical tank


Tom, if  the air compressor is taking longer to the fill than normal, it is  often a pump seal problem, a pump gasket failure, or an intake or pressure valve failing and the fill time can be related to the size of the tank as well.

An 80 gallon tank, and a 50 second fill to increase tank pressure by 30 PSI doesn’t seem all that long to me, but again, what was the fill time when you didn’t notice a lengthier time?


Are there any other symptoms that you have seen or heard on the compressor… not leaks etc.?

The troubleshooting page has links to pages about the various things that might cause this compressor issue, and if you have a look at those pages, they will provide some insight.

Please post a comment with what you found when you checked, will you?

by Pete Morgen
(Lincoln University, PA19352)

Slow Recovery on VT627505AJ L5/5/09-00114 VT470000AV

My compressor takes 4 minutes 22 seconds to recover from 95 psig to 140 psig. Is that slower than expected?

I use clear synthetic compressor oil that I purchased from a local compressor/fastener/nailer dealer. Why do you ship the machine with the fowl smelling animal oil in the compressor?

The machine is only 4 years old. I never spray paint with it. I occasionally run air tools. I suspect I might have left the animal oil in the machine too long initially. Should I plan on replacing the rings & gaskets? Thanks.

Pete, a response:

Question 1)  That seems to be quite a bit longer than it should be.

2)  I don’t ship them with “fowl smelling animal oil in the compressor” as I don’t ship compressors at all.

3) The condition of the gaskets / rings / valves changes over time and amount of use. I doubt very much that the cause is “I might have left the animal oil in the machine too long initially” but I suppose it might be.

See the page in the troubleshooting section about the many reasons why an air compressor will run and not build pressure for some tips and checks to help diagnose your compressor problem.