Small compressor - pressure switch issue

[trooper1954]

Hello all,
Have an issue with my compressor not charging above 90 lbs....pressure switch set at 120 psi, so I took the cover off and although the two adjustment screws were sealed with some sort of white paint, i attempted to adjust the pressure upward.
Now the compressor charges to 80 psi, but does not progress any further and does not cut out...runs continuously!
The pressure switch is a Lefoo LF 10-4H 95 cut in - 125 cut out.
Basically all I did was turn the upper screw clockwise but I saw no improvement when I did this so I've tried to set it back where it was but no joy...ends up with the problem above.
I'm not opposed to buying a new switch, but would` like to know how to adjust this if possible.
Thanks for any help.

[gimpyrobb]

Are you sure the gauge is good? Have you another one you could try?

[Scotts]

Check your intake filter. I was given a 60 gallon piston compressor that would not go above 60 PSI. It is a low cost compressor and has a piece of felt for an intake filter and it had a layer of paint overspray on it and I took my pocket knife and scraped off that layer and put it back in. Not an issue since.

May not be your issue, I would sure give it a look.

Scott

[dubby]

Yep, if it's not getting to a higher pressure and not cutting off, I'd look for another issue before suspecting the switch. Check all the plumbing on the machine from the head to the tank. One of my smaller units put in a very good life until the lines started doing something similar. At lower pressures it wouldn't leak, but once it got high enough it developed. Due to the noise of the machine you couldn't really hear it. The direction of the cooling fan kept me from "feeling" it also.

I had to make up a new copper line, but it wasn't as nice as the factory one and only lasted a year or so. Decided to buy an entire direct replacement unit and noticed they'd changed the routing of that line where it would have less stress on it.

[trooper1954]

The reason I suspect the pressure switch is its the only thing I've messed with....went to 90 psi before, and only goes to 80 now....Thanks for the other suggestions, I will look at those but as far as I know there are no leaks (covered every connection and lines with soapy water)

[GWIZ]

I'm going to guess one adjustment is to set the high pressure set say 120
and
the other is the deferential on set say 10psi 20psi below the hi set to turn back on. you may have it set too hi.

at one time the older compressor were set at around 90psi and that was it, I think it was a law.
I have two and 90-100 is it, I have been thinking about getting a 135psi looks like nail guns like 90psi and the 90-100 will not keep up.

[trooper1954]

Thanks to all for their input....I disassembled all connections and re-did them with new teflon tape...then reassembled and switched the compressor on.
It now charges to 120...and cuts in again at 90....dont know why this has solved the problem but it has....there were no leaks prior to dissassembly!!
Anyhow, all is good for now.

[dubby]

Great. Sometimes you don't have to find the exact issue to fix the problem.

These little machines vibrate a lot. There's no weight to them. I've got one that will scoot across the floor, even on rubber feet, about 10' every time it cycles on. They're not necessarily assembled in super factories to begin with, so it's easy to see why things will work loose.