bisley57 Posted August 20, 2009 Share Posted August 20, 2009 I have a bendix air dryer on a MR 688 and the air dryer seems to be "popping off" much more than usual.It use to do it very rarely but now it seems to pop every 2 or 3 minutes,way too much.No noticable air leaks in the system as it holds 90 -100 psi over night.I just read in another post there is a filter and unload kits at Truck Pro,I have never fooled with one before.Any input would be appreciated. Quote Link to comment https://www.bigmacktrucks.com/topic/10397-air-dryer/ Share on other sites More sharing options...
terry Posted August 20, 2009 Share Posted August 20, 2009 Unloader valves will do this, had a truck at work doing that and a valve kit fixed it. terry Quote Link to comment https://www.bigmacktrucks.com/topic/10397-air-dryer/#findComment-39320 Share on other sites More sharing options...
ThaddeusW Posted August 20, 2009 Share Posted August 20, 2009 Guy on hanks posted the same problem. Turned out to be the unloader valve, 15 bucks is all it cost him. Quote -Thad What America needs is less bull and more Bulldog! Link to comment https://www.bigmacktrucks.com/topic/10397-air-dryer/#findComment-39339 Share on other sites More sharing options...
Noid93 Posted August 20, 2009 Share Posted August 20, 2009 Easy task too. 5 or 6 bolts on the top of the head and pop the old parts out and new in. Thats about it. 20 min job for a first timer. Quote There Is No Replacement, For Displacement!!!!! Link to comment https://www.bigmacktrucks.com/topic/10397-air-dryer/#findComment-39349 Share on other sites More sharing options...
bisley57 Posted August 23, 2009 Author Share Posted August 23, 2009 (edited) Easy task too. 5 or 6 bolts on the top of the head and pop the old parts out and new in. Thats about it. 20 min job for a first timer. Finally found the problem,I changed the dissectant filter and rebuilt the purge valve,didn't make any difference.Soaped up the lines and found a leak at the control line coming off the compressor,fixed.I went to Bendix.com and read some excellent bulletins they have available there.I learned if your air drier purges more than once every 4 minutes at an idle,there is a problem.Bendix offers a lot of information on their valves,wish all suppliers did this. Edited August 24, 2009 by bisley57 Quote Link to comment https://www.bigmacktrucks.com/topic/10397-air-dryer/#findComment-39469 Share on other sites More sharing options...
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