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Air dryer
I have an 05 Vantare H3, this past May I had an air leak in the front, went to Prevost, Jacksonville, they replaced my air dryer, drove home to Ma. Made a trip to Ky. No problems till this week, Air guages have been staying up at 125, till this week, ran the engine just to keep the engine parts lubricated, and now my front air drops overnight to “0”, any segestions on where to check?
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15 Replies
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Take it this is fairly new coach. Air drier are not all that complicated. Air in from compressor out to wet tank and a control circuit from governor plus a heater. Local truck supply should have new unit in stock. Take it your at Sanford. Sounds like run around to me. You can buy unit off shelf for less than $200. fwiw Bob
Ps if they have put some more complicated unit on (doubt it) no more that 375.
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Yep, just recently did mine because the purge valve was hanging open too long.
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One thing that is very helpful when posting about problems is adding a signature line in which the coach year and model is listed. Prevost has used a variety of dryers over the years and knowing the vintage coach helps folks who respond to be more specific in answers. Both the above answers were correct and while generic they are accurate in pointing out an air dryer is simple, serviceable and relatively cheap.
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Year is important and coach model. Converter not so important.. Basic systems are the same. Will share what I know. Also at least first name. So I may address a response. I am no factory expert but have had 90 % of these coaches apart and managed to put them back together. Willing to share. No $ involved. It’s a hobby to me. I learn something new every day. Bob
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Bob and others,
Adding the name of the converter is sometimes very important. For example if a discussion revolves around inverters Liberty and most others run a limited number of dedicated circuits through the inverters, but a Vantare runs everything through its inverters.
Having that knowledge will help make responses to questions more accurate. Regarding a homebuilt conversion an owner asking a question has to provide specific information about how the systems are set up. For example, if you do choose to run interior lighting from the chassis batteries asking questions relating to that of a motorhome conversion owner will never get a good answer because their mindset is always house and chassis are always separate.
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ok, 2005 h3-45 got repaired no charge! I thought that was pretty good installed a new unit too! Coach Liberty. Do not know why I got it for free but am ok with that. Gary Carmichael, 2005 H3-45 Liberty. It was a simple job to change the filter must have gotten some trash in it? Unfortunatly due to a back problem I have to pay to have it done, but did watch the work being done. Five years ago I would have done the work in 30 min hell to get old!
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Gary understand back problems. Meeeee tooo didn’t sign up for that!! Glad it worked out. Glad to know your first name. A coach that new shouldn’t have had dryer problems already unless you got a 100,000 miles on her. If you do good for you. Any thing else come up just yell. If I’m close; might have a friend close we will help out. No $ involved for me–might have to feed me. Have bus friends in lower 48 and Alaska. Will be in Florida Feb thru April myself in Ocola area. Bob
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Will be in Riverbend thru April, come see us site 186 Gary
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will have to look up Riverbend.. We stay on 40 west at Wilderness . Enjoy the warm weather. Bob
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the coach has 68000 on it just getting broken in!
Gary and Megan Carmichael
2005 H3-45 Liberty
Floyd V.A., Southport N.C.
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Bob Is Wilderness the park that has a store out front that sells whoopy pies? Rick
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yes it is–45 minutes from 500 (daytona) And bike week.. Plus Live Oaks Ivatitional. Lots of things going on close by. $400month plus elect in preserve(restricted part of park) Plus we have friends there. we use it as home base and move around. Bob
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Art, difficult to answer without hearing it, but generally speaking when the set pressure is reached the dryer “sneezes” once and that is it except there might be a small diminishing hiss until it closes off and stops discharging air. But the key is in your gauges. Do they hit 120 (or whatever is norma) and does the dryer purge and the pressures remain at 120 r do they drop, and if they drop, how much and for how long?
They should build pressure, the dryer shoud sneeze and the they shoud sit solid.
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If you have a Bendix AD9 dryer, once the purge begins, that valve stays open until the next charge cycle begins. And that is determined by the set pressures in the governor (regulator) which is bolted to the compressor, for example build pressure at 100 psi, stop building pressure at 120 psi. The governor monitors psi in the aeroquip line from the wet tank to the governor for this control.
If it sounds like you are getting two purges on one cycle, verify that the delivery check valve at the bottom of the dryer is not hanging up before it closes. This prevents air presssure from flowing back into the dryer from the wet tank. Problem sounds dryer related because the compressor would not build 20 psi quick enough to get an immediate second purge. Still thinking. -
If you have a Meritor Wabco System Saver 1000 or 1200E, here are some links. Look on p.6 of pdf
http://www.meritorwabco.com/MeritorWABCO_document/mm34.pdf
http://prevostcommunity.com/forum/threaddetails.asp?Category=Pneumatic&ThreadID=6109
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