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Aux Air Compressor Cycling Every 2.5 hours
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Larry,
That’s not a problem, many do.
I would not add a belt now. Wait and change with 3 new, old ones are stretched and you don’t want 1 new belt carrying the load. Save for a rainy day.
Farmer Dan’s bus is close to yours he will help you get your leaks acceptable.
When you find the bumper handle you will say how in the world did I miss that. I’ll go out on a limb and say your Marathon Aux tank behind the bumper is trashed. You’ll know when you open drain valve.
I can’t stress enough the old air posts are so valuable to Marathon and other owners. A1 does a great job on showing Frank how he should of plumbed his Liberty and many pictures to help.
Later
bv
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The mention of having tight belts before starting the coach often starts a panic among new owners who have not done that, and then realize a coach that is running with no aux system pressure is going to have loose belts.
I NEVER aired up my coach or tightened the belts prior to engine start. I also never had a belt jump off. But, I also never went above a slow idle for several minutes, by which time my aux or accessory system was airing up.
Keep in mind the thousands of commercial seated coaches in service are often started with zero pneumatic system pressures. Those coaches do not have aux compressors. Don’t let folks on here make you think it is imperative to have tight belts before starting the coach.
Having said that I admit to reaching the end of my patience with regard to the belt tensioning system Prevost installs. It is a great system and makes belt changing a one minute job. But I just got tired of leaky valves or a leaky pressure regulator. I got tired of a leaking check valve. It was annoying finding leaks at the fittings and leaks at the little bellows. I abandoned the entire system and instead made a simple jack screw belt tensioning system. Works like a charm and my belts are always tight.
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Double K – Never thought that for a minute, we all learn with help.
Larry – When you open the bumper and see a green tank, get it replaced ASAP, it will be full of rusty water. Go to the following post I did: Marathon H Aux Air Tank
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When replacing the group 3 belts order them from Prevost. Why ?
These belts are known as match sets. Cut to size 1,2,3, from the same roll. Your belts are same in tension and size. This is the preferred way in replacing this set. Much longer life as they will wear the same.
Single part number for this item.
AL
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Locate this item behind the red gate valve in your engine room. If your mini air bags are new or in good condition and your still have leak down, this could be the problem. This check valve keeps your mini bags full.
Even Prevost techs have missed this one and one other guy.
AL
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It looks like this would be a good time to replace the 3 belts with 1 triple belt. Other have posted displeasure over this setup but I found it to be awesome in my 8V92 for 20 years and I replaced the existing 3 belts on this Series 60 and remain very happy. I got it from Amazon DD Power Drive 3/A74 banded V belt for $33.56.
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Thanks to all for posting about that red valve in the engine compartment. I had no idea I had one but there were multiple posts on multiple conversion so I had to go take a look. I found it above my head against the wall above the doors. There appears to be a pressure regulator as well as a schrader valve. What should the pressure to the mini air bags be and can I check it there with a tire pressure gauge? I will be cleaning this area up and looking for leaks. The check valve must be working as the air bags stay inflated even when the aux. tank is at zero. When put all new belts on I had to crack open one of the connections in the air line to get the air out. Now, just the turn of a knob! Thanks.
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LARRY. i too have chased aux air leaks on the house marathon system for three years. finally fixed. one leak was the step slide ram bypassing, put an electric air switch in fixed. next one was forever to find. the bed lift ram were bypassing. but only and the down setting and could not find it till a pulled the head panel under the bed platform, put my leak detector probe under the platform and lowered it and big leak out of the mac exhaust port. rams obsolete found some on ebay replaced them now 3 weeks no air loss. hope this helps another member if not you maybe someone. wish i had read this one 3 years ago.
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TWSLP…this helps me…Thanks!
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2.5 hours is not bad for cycling the aux compressor. Ours cycles every 18 minutes, and the runs for about 2 minutes after several leak fixes by Marathon. I installed a switch in the power line to the aux generator, since there is no need for aux air when we are not in the coach. Also, keep in mind tour buses as a rule does not have aux air, yet start the engine all the time without belt tension bags inflated.
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