Quote:
Originally Posted by Mackman
I have been driving a 2001 mack CL 350. It builds a 140psi and the air dryer goes off once every 5-7 secs. I told the mech he said he would look at it and that was 2 weeks ago. Is this a major problem safety wise. :?: :?:
when the air dryer goes off, is it just a single blast of air? if so, I would guess that the compressor is cycling (loading and un-loading continuously). the reason the air dryer "goes off" is becuase the compressoor has been unloaded... that same signal pressure moves to the air dryer purge valve. when the pressure relief valve opens, it usually stays open for a number of seconds. pressure relief is
usually set @ 150 psi.
the safety element is only due to the fact that the compressor will eventually fail from an excessive duty cycle. but..., in operation, as long as your primary and secondary pressures remain good.........