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dumping tanks how to?
My cousin inherited his father’s 1988 Prevost Liberty but never got a walk thru, so he knows nothing and I know less.
He wants to know how to dump the tanks, but we can’t find any pull handles. Research indicates it might have some type of automatic dump with an interior switch, but again we’re lost.
Can anyone help us?
TIA. Dean
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13 Replies
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take some pictures, and post them here
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Where is the bus or where you live?
If you are having trouble finding a dump valve that suggests there are far more and greater issues you need to address. I am not putting you down but saying these are complex and it is even likely previous owners made modifications from the original making the chance you can make a serious and expensive mistake likely.
The best starting point is to get someone with knowledge of a Liberty and its systems to help you.
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We are not new to RVing. I have a Montana 5th wheel and a HR motorhome. Both have dump valves and the 5th wheel has 2 drains. So no problems knowing how to dump. We can’t find any dump valves and as I mentioned and research seems to confirm there is an electronic dump valve. We just don’t know where to look for it or what to expect. Some of these only have one tank and not a separate black/grey.
Thanks for your advise though.
Dean
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pictures will help
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I’m not sure what you want pictures of? The MH itself? I was hoping someone had knowledge of this unit. 1988 Prevost Liberty. Other than cosmetics, what would change? Please excuse my lack of Prevost history.
Dean
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The pictures would be of and around the area in question. Maybe find out where the stuff exits the motorhome, and start there working back as far as you can to the tank. Also your pushbuttons lit up.
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To the best of my knowledge that vintage Liberty had manual dump valves. Later models have air operated dump valves but controlled by a touch screen device in the inside of the coach if a password is used, or by buttons at the holding tank bay.
A Liberty holding tank is in the last bay, driver’s side adjacent to the generator. From the bottom of the tank is the dump valve, an elbow extending down and out and the sewer hose connection fitting just outside below the floor
Some Liberty coaches also had an optional macerator mounted on the top of the holding tank, fed from a smaller outlet pipe at the bottom of the holding tank, going up and over the tank to the macerator.
But like I said previously if a previous owner made modifications you have a do it yourself problem to solve.
Comparing a previous RV regardless of make to any Prevost conversion and finding they are set up and have the same systems is unlikely.
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Liberty also has only 1 holding tank for black and grey. There should also be a grey water by-pass valve that allows the grey to go directly to ground instead of into the tank (not legal everywhere any more).
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Liberty has had variations. My first Liberty had separate black and gray tanks, Not all have a gray water by-pass.
What has me unable to state anything with confidence is if the coach came with an aluminum holding tank it was likely replaced and if that is the case whoever replaced it likely made a change to how it is set up to dump, hence the original suggestion to get a nearby Liberty owner to take a look at the coach.
At least post photos.
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I will be getting pictures. I thank you for all the suggestions and info. I’ll update when I get a chance. It’s in New Durham NH near Merrymeeting lake if any Prevost owners wanted to look 🙂
Dean
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Have you spoken with anyone at Liberty about the coach and your concerns?
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Nice i was born and Raised in NH, just came back from my High school reunion last weekend.
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Looking at the pictures of another 88 liberty we were recently working on. the dump valves should be manual t handle style.
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