Question about air governors

There are non adjustables with wider swing than 5 psi though too

 

Mark your lines, it aint a heart transplant

 

When the air pressure reaches the governors preset pressure 125 PSI it opens
internally and momentarily letting air into the discharge port. The air supply from
the governor is not continuous its just a quick burst that unloads the compressor and
discharges the dryer. When the pressure drops to 100 PSI the governor exhausts
the air and the dryer closes and the compressor starts pumping again.
If the air from the governor leaks off the compressor will start pumping again until
the governor discharges again.

Some of the equipment that I once worked on had 2 Bendix compressors and
2 AD9 dryers to supply enough air to run the clutches and brake bands and winches.
One governor did not supply enough air to unload 2 compressors and 2 dryers reliably
so we used to install a small relay valve that the governor controlled and the relay
valve supplied constant air to unload and discharge.

If your compressor starts pumping too soon the air has leaked off. Its either leaking in
the dryer the governor or the compressor or the line from the governor to the compressor.
You could plumb in a gauge in the unloader line and see if its dropping. Its probably a 1/4"
plastic line, it wouldn't be a big job to run a new line.

 

Odd that it cycles at all if it is not losing air when parked? Has to go somewhere to make room for the fresh dose of air every time compressor kicks in and adds that 5psi before cutout. But, nevertheless, God bless you for not parking next to me on your 10 while I am on my 4.