Air Dryer System

It's supposed to purge each time your air governor reaches cutout pressure. What kind of truck?

 

is your air pressure gauge going up an down that fast? I really don't think the compressor could go thru a cycle that quick, so I would guess the dryer and valve need to be maintained replaced.

If you don't have any leaks, and are not traveling on rough roads that you air suspension is working hard, or using your brakes, it could be hours between dryer cycles.

 

When air is leaking off of the unloader circuit, either past the O-rings or at the air governor mounting gasket the compressor and dryer will quick cycle. What kind of truck, compressor/dryer setup?

 

Actually I did forget where I was at the time but am still wondering what year of truck? The slight pressure loss that causes quick cycle of the dryer won't be seen on the guage or easily heard outside the truck. Is the air governor compressor mounted or remote? Do you know what compressor you have?

 

The quick cycling is most often caused by a small air leak in the unloader valve air circuit causing the unloaders to repeatedly seat and pump air and hit cutoff pressure over and over and over again.

 

i had the same problem , although my truck have d 12 ,the culprit was in the first air tank ,its divided and there is one way valve inside ,if valve get stuck open you'll have leak from purge valve right after purge ,if it is so you need new air tank