Air Dryer purging rapidly question

When mine did that, it was the spitter valve gone bad. I ran it till it seeped constantly, had to by pass dryer, till I replaced the whole thing. AD9s are less than $200 at Fleetpride comes with new brackets Last one I had with a weak spitter valve, I could take a screwdriver stick it in and push the valve up, hold it for a few seconds, till it stayed. You can try that, if in a jam. But be prepared to bypass or change the spitter, or whole dryer, if it starts leaking constantly. Not worth rebuilding or just replacing spitter. PITA anyways. I tried to replace o rings on old one. Mine was different, couldn’t get them out easily. But sometimes you can take the spitter off and clean the o rings, I guess. Didn’t work for me. Easier to just swap the whole thing out, and forget it for a few years. If that’s the problem. Gauges holding steady, shouldn’t have a leak. The new ones sound funny, they spit out for a longer time, at first. Sounds like something’s wrong, But it’s normal. After a while they sound normal. Just a heads up, if you change the dryer.

 

Could be any of several things. I’ve had a leaky governor gasket,unloader valve and a cracked dryer housing do that.

 

If its not the valve it could be a very small leak getting around the main body “hat” and housing o-ring. Sometimes tapping on the valve may knock the debris loose from it. I know on my old AD-2 it has a similar valve as the AD-9 and it sticks a lot for some reason. Tap tap and goes back to normal for awhile.

 

Silly question here. You have changed the filter thats on the drier right? Lots of times the filter gets ignored. I would say if filter is within a year probably not it. But worth a try. Newer ones have a spin on filter. Older ones from 80's you had to take apart to change filter. If yours is old, i would replace it. Dont know the model #'s like Rideandrepair. Lol. I do know that the one on my 01 pete was more expensive at pete dealer. Stopped at freightliner and was same one for less$. Changed it right there in their parking lot.

 

Quit beating around the bush and change it..

 

. All know is AD9 Thats all I’ve ever had. I’m sure Dino Soar has an AD9, also. Like the one pictured. I don’t really understand how the whole system works. Just change govenor, if there’s a problem, or dryer, and cross my fingers. Lol.

 

Changed my air dryer unit and mine stopped popping off every 25 sec.