GlennWest Posted August 3, 2016 Report Share Posted August 3, 2016 Truck has not been run for a couple of months. All air pressure down. Started today, pulling out tomorrow. Built air but slowly. It is building air though. Changed purge valve during maiden trip. Do I have a problem or is this normal when setting up? Link to comment Share on other sites More sharing options...
jeffw Posted August 3, 2016 Report Share Posted August 3, 2016 How slowly? i'd expect it would take 90 seconds to 2 minutes to build full air pressure (125psi or so). Is there any obvious air leak (hissing)? Link to comment Share on other sites More sharing options...
Chad Heiser Posted August 3, 2016 Report Share Posted August 3, 2016 What do you mean by slowly? Per the CA CDL air brake test, "When the engine is at operating rpm’s the pressure should build from 85 to 100 psi within 45 seconds in dual air systems." Is it slower than this? If so, you have some issue. Link to comment Share on other sites More sharing options...
GlennWest Posted August 3, 2016 Author Report Share Posted August 3, 2016 Oh I let it run for 5 minutes maybe and got to 100 psi. No obvious air leak. Didn't get out whisper though. It holding air. Still at 100 and that's where it was when shutdown today. Link to comment Share on other sites More sharing options...
jeffw Posted August 3, 2016 Report Share Posted August 3, 2016 also, once you have good oil pressure you can bump up the idle and build air more quickly. I'll wait until i see a solid 60psi on the Volvo and then bump up the idle RPM by 200-300 or so. Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted August 3, 2016 Report Share Posted August 3, 2016 If the air system had leaked completely down, it will take several minutes to air up. I would guess 4-5 minutes at idle would be about right. Between 3 tanks, the rear air bags, all the hoses, seats, etc, there is a bunch of cubic feet to fill. Link to comment Share on other sites More sharing options...
GlennWest Posted August 3, 2016 Author Report Share Posted August 3, 2016 Ok. Thanks. It doesn't build air as fast as I read it should. But it works. This is first time let set until all air leaked out. I considered changing the dryer filter but it looks new. Got to pull dryer to change govenor. Only reason not new one on there. Planning to relocate it. Link to comment Share on other sites More sharing options...
GlennWest Posted August 5, 2016 Author Report Share Posted August 5, 2016 Towed today. Air is good. I just had never let it get to 0 psi before. Link to comment Share on other sites More sharing options...
Scrap Posted August 7, 2016 Report Share Posted August 7, 2016 You dont want to relocate your governor. It'll mess your dryer all up. Sounds like you are fine and everything is working anyways but at least that one can come off the to-do list too. Link to comment Share on other sites More sharing options...
GlennWest Posted August 7, 2016 Author Report Share Posted August 7, 2016 If that govenor goes south the dryer has to come off to replace. Not a beside the road emergency job. Link to comment Share on other sites More sharing options...
Scrap Posted August 7, 2016 Report Share Posted August 7, 2016 Two bolts, a couple o-rings, and undoing the air hoses and the whole dryer/governor assy comes off and goes on a bench in just a few minutes. It is probably worth a shot at trying it at home once so you can solve corrosion troubles and learn how the delivery check valve fits in the governor section before a roadside repair though. The hope is that it is all moot as you won't have the troubles that under hood mounted governor guys have and you'll never have to change it but I guess a guy should be prepared. Link to comment Share on other sites More sharing options...
GlennWest Posted August 7, 2016 Author Report Share Posted August 7, 2016 So a govenor under on frame is less troublesome? Mine working just read on here one can go out and strand us and happens enough the forum recommend carrying spare Link to comment Share on other sites More sharing options...
porky69 Posted August 7, 2016 Report Share Posted August 7, 2016 Underhood mount means more hoses/connections, places for moisture and crud to buildup. May be easier to service but brings its own headaches. 20yrs+ and several million kilometers I have never had a failed air governor strand me on the road...not saying I haven't had to replace a governor or three but it is not a super common issue but it is a super cheap and easy way to rule out problems with one part of your air system so it is the most "common" recommended first step in air system diagnosis. I doubt that the air dryer needs to be removed from the truck to change out the governor but if it does it is an easy job if you have the tools (if I had to I would do it on the side of the road), I don't doubt it might be inconvenient to get at but it will be serviceable on the truck. Link to comment Share on other sites More sharing options...
LostSoul Posted August 12, 2016 Report Share Posted August 12, 2016 Wait, holds 100 pounds overnite? I need your air guy. Mine won't hold pressure longer than 4 hours. I thought it was just cause California was sucking the air out of it because my wallet was empty! Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted August 12, 2016 Report Share Posted August 12, 2016 Wait, holds 100 pounds overnite? I need your air guy. Mine won't hold pressure longer than 4 hours. I thought it was just cause California was sucking the air out of it because my wallet was empty! The longer you hang around here, the better you'll see how particular some of these guys are about their trucks. There are some here that are in better shape than when they left the factory. Some hold air better than a submarine.... Link to comment Share on other sites More sharing options...
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