Air question for the experts

Are you saying after the 10-20 seconds of slow air leaking from the bottom of the dryer that air is still leaking after that? Air dryers are supposed to continue to purge at a slow rate for up to 30 secs to regenerate the desiccant inside the cartridge.

 

what air dryer do you have? on some driers purge tank (usually 5L) is used, after loud purge it keep leaking slow.

 

Try a whole new dryer. I hada similar issue on an international with an ISX and an AD9. Replaced the cartridge and the purge valve as well as the compressor and governor. Would up replacing the whole air dryer and the problem went away. I believe you can buy a reman bendix ad9 for a little bit more than the price of a cartridge kit.

 

I agree with BigCam...been through this on a few of ours. Replaced, cleaned, rebuilt everything....just like you. Put a new dryer on it and solved all issues. Makes NO sense...but works everytime. Crowburlinggame (bumper to bumper) stores can get them and are WAY cheaper than a dealer (Kenworth for us).

 

sounds like you have a air leak on the line that goes from the gov to the dryer i just went though the same thing last week i changed all the stuff you did and turned out to be a leak

 

New dryer.... my old AD9 did this on my S60. I found the check-ball inside was bad and sticking. Replaced the whole assembly and it stopped it.

Do you have gauges for Primary tank and secondary tank???? If so, which one is leaking down??

 

I was just going to replace my check-vale as well, but the Pete dealer had an AD9 dryer sitting on the shelf on sale for $99 so i went that route. I believe changing out the check-valve will fix it.