Kellogg 331 pressure adjustment?

[joe121]

I got my 1956 kellogg 331 compressor running. It pumps up to 175psi. I want to lower the pressure to 150psi. It has the original contactor with a nut on top the spring. Will turning that nut lower the pressure and witch direction and can i lower it that much? Thanks, for any info, Joe

 

[MacMcMacmac]

Yes. Back off the nut so that there is less spring preload on the contacts and you will lower the cut out pressure.

 

[joe121]

thanks, that worked, adjusted so it shuts off at 140,starts at 98. Can the turn on (98) be raised up to about 110?

 

[metlmunchr]

Depends on the particular pressure switch. Some have a fixed differential with the one adjusting screw for cutout pressure while others have a second (usually smaller) spring loaded adjusting screw to set the differential pressure.

 

[Compressed]

Hey joe121 did you get the 56' Kellogg running?
just curious on parts availability for those.

 

[seber]

There should be instructions on the side. They always seem to be on the side you don't see from the position you stand on.