Hook n ladder 1 Posted April 12, 2020 Share Posted April 12, 2020 1998 Ch 613 The purge valve was stuck open the other day and I lost air (compressor running). I knew I had a filled up air dryer cartridge. I change the cartridge twice a year as my system has always been "dirty". So I put the new cartridge on and it seemed to solve my problem for a few days. But for those few days the purge seems gradual and long not that quick psss you normally get. Now it seems to be sticking open again. I lose air but not as fast as before. Is the dryer/purge valve shot or do I need to start looking somewhere else? Thanks in advance. Quote Link to comment https://www.bigmacktrucks.com/topic/62014-air-dryerpurge-valve-help/ Share on other sites More sharing options...
Rob Posted April 12, 2020 Share Posted April 12, 2020 The purge valve is a replaceable service item. Sometimes you can clean them but if you're not really handy it's better to either replace the bottom plate complete, or just the purge valve itself. Different dryers take different scenarios, but none are hard to service. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/62014-air-dryerpurge-valve-help/#findComment-448487 Share on other sites More sharing options...
Bullheaded Posted April 12, 2020 Share Posted April 12, 2020 Yep, change it. I had the purge valve fail on my brand new 2020. Then not long after the un-loader valve had to be replaced. They sure don't make parts like they used to. Quote Link to comment https://www.bigmacktrucks.com/topic/62014-air-dryerpurge-valve-help/#findComment-448529 Share on other sites More sharing options...
Hook n ladder 1 Posted April 13, 2020 Author Share Posted April 13, 2020 Thanks. I'll give it a try. Quote Link to comment https://www.bigmacktrucks.com/topic/62014-air-dryerpurge-valve-help/#findComment-448617 Share on other sites More sharing options...
turckster Posted April 14, 2020 Share Posted April 14, 2020 What type/brand of air dryer do you have? Most common for that year was the Bendix AD9 dryer. The housing top has to be removed to replace the cartridge on the AD9. Really shouldn't have to service air dryer cartridges/filters for at least 150,00 miles. Quote Link to comment https://www.bigmacktrucks.com/topic/62014-air-dryerpurge-valve-help/#findComment-448711 Share on other sites More sharing options...
Rob Posted April 14, 2020 Share Posted April 14, 2020 If you are having to change the filter/drier/cartridge often your compressor is suspect as this is not normal. I had three AD-9 series on trucks and serviced them every fall going into the winter months using only genuine "Bendix" remanufactured elements/kits. Never had any problems. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/62014-air-dryerpurge-valve-help/#findComment-448721 Share on other sites More sharing options...
Hook n ladder 1 Posted April 14, 2020 Author Share Posted April 14, 2020 I have an AD-SP. I've always had to change the cartridge twice a year. Even through different compressors (and a reman engine) I've always had a dirty system. I do local dump work so that won't help things. Quote Link to comment https://www.bigmacktrucks.com/topic/62014-air-dryerpurge-valve-help/#findComment-448744 Share on other sites More sharing options...
Hook n ladder 1 Posted May 6, 2020 Author Share Posted May 6, 2020 Changed the purge valve and that solved the problem. Thanks boys. Quote Link to comment https://www.bigmacktrucks.com/topic/62014-air-dryerpurge-valve-help/#findComment-450501 Share on other sites More sharing options...
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