Bendix AD-IP Air dryer problems

Having a problem on an International 2010 8600 with an Cummins ISM. The other day I noticed that the air tailgate latch in the truck was wet when I flipped it and water was present at the valve in the truck. Obviously I figured out there was water in the system. I went to drain the air tanks and one of the three eptcocks released a bunch of water. I have noticed lately that the air dryer hasn't been purging air like it usually does. I ended up changing the cartridge on the air dryer and nothing has changed. Last year I changed both the cartridge and purge valve on it. Seems like when I'm on the road hammering on the throttle the air dryer seems to spit off air as it should. At idle and low RPM, it doesn't seem to be spitting out air. It seems like every ten seconds or so I can hear the air under the hood spooling up under the hood but the air dryer doesn't spit off. I've been doing some research and it seems to point to an air dryer internal issue or a governor issue. I've changed brakes and have done some major maintenance on my trucks in the past, but I'm lost with this air dryer issue as I haven't messed with them much. I'm not even sure where the governor is or how to check it. I believe it's a Holset compressor. I purchased a new air dryer on ebay for $150 as I figure its worth it as I just spent $100 on the element from the local parts store because I needed it quick. I don't want to switch out the air dryer unless it's bad. Would rather figure out what the problem is. A picture of it is included. Any help would be greatly appreciated as I'm sure I can fix it as long as I know what to look for.

 

Heavyd, I haven't had chance to look at it yet but will this week. Does it sound like it's more of a governor problem as it seems like the air dryer is working at higher rpm's and not at an idle? Is there any chance that the problem may be somewhere else than the governor, air dryer, or line going to the air dryer? I'm thinking of just replacing both and be done with it. Still be cheaper than taking it to the mechanic and I won't have any down time.

 

Today I had a little time to check things out. I disconnected the silver hose at the governor and it's definitely pushing air out when the tanks have full pressure. Seems to be about every ten seconds or so. I hooked the line back up at the governor and disconnected the line at the air dryer. It's definitely pushing air out there also. I even pinched the line and could hear the compressor whine when the governor popped off. The Air dryer is definitely not bursting off every time the silver air line is charged. Is it possible the governor is not sending enough pressure to burst off the air dryer? I didn't check the pressure to the silver line with a gauge. It definitely doesn't sound like there are any leaks in that silver lines and the connections are good at both the governor and compressor. I took a look at the troubleshooting guide from Bendix today and it doesn't give you much. Is it possible the purge valve I replaced went bad? It definitely seems to be working better at higher RPM's.

 

Wow this is getting complicated, lol. If there's an air leak will it be between the silver/black line or the entire air system? The truck seems to hold air pressure real good, even after sitting for hours. Is there any way to test the air dryer to eliminate it from the equation? Like maybe using a compressor and putting 120 psi to the port where the silver line goes in? I really wish I knew how to properly troubleshoot this thing. We need to make a youtube video!

 

Well today I installed a new air dryer that I purchased off ebay. Still no luck and the new air dryer isn't working. I took the new dryer off and put the old one back on as I don't want to ruin the filter on the new one as I believe it will saturate the filter if the dryer isn't working.

 

Heavy D, is the unloader valve in the head of the compressor on this truck? I'm starting to think that's where the problem is after doing some reading. When the dryer was purging, it was going off every 15 seconds or so which seems to be way too often. I'm going to pull the fender off today so I can get close to everything and check for leaks.