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Old 02-22-2020, 03:46 PM   #1
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Plumbing

Iím having issues with my black tank valve. I donít think itís opening or closing. I canít find a plumbing schematic anywhere. Does anybody know where I could find it? It didnít come with the fifth wheel when I bought it.
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Old 02-22-2020, 04:30 PM   #2
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You are not going to find a diagram as they do not exist. The dump valve will be close to where you connect the sewer dump hose. You should be able determine if it is moving, by having someone move it while you hold your hand on the valve assy. Be sure you have a hose connected. If it is remotely operated, it is possible that the cable broke or froze if you have had freezing weather.
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Old 02-22-2020, 04:35 PM   #3
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It has a cable that goes to the valve because it has a sealed underbelly. When I pull the handle it feels like it is working right but nothing comes out of the tank and the tank is full. Kinda stumped.
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Old 02-22-2020, 05:08 PM   #4
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If it's out of warranty, cut a three sided flap about where you think the valve is and open it by hand, AFTER you have a dump hose connected! Then repair whatever has came loose. Make sure your flap opens to the rear. After you have tidied up in there, reseal the flap with a good allweather tape. Or sometimes there is already a flap that someone else has opened.
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Old 02-22-2020, 05:15 PM   #5
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May be one of 2 things. Outlet blocked by cut out disc dropped into the tank caused by factory. OR poo pile caused by you for leaving the gate valve open while on sewer connection. Did you do that??

Might be time for a has mat suit!

Is the tank really full or are you just reading the lights? Are you sure you are pulling the black tank and not the Gray??
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Old 02-22-2020, 05:38 PM   #6
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I agree with a cable problem. The cable could have become disconnected from either the handle or the valve. On a previous TT of mine the black drain valve would not open very much and took a long time to drain even water. After opening the underbelly I found that the distance from the handle to the valve was less than three (3) feet but the cable assembly was six (6) feet. The outer spring of the cable assembly was wound around two (2) times for some odd reason. When the handle was pulled the circle of the cable assembly would just close up and not allow the wire inside the spring covering to work properly. I just shortened the whole assembly to where it was as straight as possible. It worked fine after that
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Old 02-22-2020, 05:45 PM   #7
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Looking forward to hearing the outcome on this one.
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