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Old 08-10-2022, 11:11 AM   #1
Nazoomer
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Black and Gray Tank Valves

hello MOC experts,
I am trying to empty tanks and the gray and black pull handles in the convenience center will not pull out. I know they are cables to the real knife blade valves. Any suggestions on how to free them? I guessing I have to remove the bottom cover to get at them?

WD 40 while a pulls and pushes on the handle? Tank monitor light says the black tank is full and the gray is 1/2 full.

The final outlet valve works.

Any help is much appreciated.

thanks
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Old 08-10-2022, 11:37 AM   #2
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First off, don't trust the tank gages. They are infamously unreliable. Some on this forum have reported success dripping oil on the shaft above the outer sheath. Let the oil run down as you try and work the handle open and close. Takes some time. I helped a friend on his RV using this method using 3-1 oil. Patience paid off on day two.
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Old 08-10-2022, 11:39 AM   #3
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My guess is that you'll have to open the bottom of your rig and most likely replace the cables. You can try working WD40 into the existing cables, but that seldom solves the problem. Also, the odds of you tank sensors working correctly are almost non-existant unless someone has replaced your internal sensors with exterior ones.
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Old 08-10-2022, 12:21 PM   #4
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Thank you I will try lubricating the cable first in hopes it will do the trick.
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Old 08-10-2022, 02:37 PM   #5
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Unscrew the handle, take a 1/2 inch piece of clear tubing and slide it over the shaft and secure it with a hose clamp. Pour about 6 inches of oil (whatever is available) in the tube and let it sit overnight. Mark the oil level on the tubing with a magic marker. Mine has worked for two years after I did this.
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Old 08-10-2022, 03:05 PM   #6
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I like that idea I will give it a try tonight, thank you
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Old 08-11-2022, 09:37 AM   #7
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NCFischers: Thank you so much! Your fix worked perfectly! I put the 1/2 tubes over the shafts and filled the tubes with Sea Foam lubricant/penetrating oil. It went down easily and had to fill it 4 times. Left it overnight and this am I was able to pull the cables out and open the gray and black valves!!

Bless you for your suggestion, thank you

Nazoomer

BTW any idea on how to get the TV to move up and or down? It is stuck half way up and I tried changes batteries in the remote unplugging and replugging but no dice?

thanks for your help I really appreciate it.

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Old 08-11-2022, 01:30 PM   #8
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.....BTW any idea on how to get the TV to move up and or down? It is stuck half way up and I tried changes batteries in the remote unplugging and replugging but no dice?.....
There should be a switch for the televator in a cabinet below the entertainment center. It will raise/lower the TV if the remote is inop.
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Old 08-12-2022, 03:24 PM   #9
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I did find that switch but it didn't do anything. There is power to the junction box because the TV will turn on?

Thanks
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Old 08-12-2022, 06:01 PM   #10
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20/20 hindesight says it would have been better to start a new Thread about the TV lift issue and not intermix it with stuck drain handles
That said, the televator is 12V and the TV is 120V. You need to check for 12V at the switch and then off to the lift unit itself.
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Old 08-12-2022, 06:34 PM   #11
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My black handle was frozen and it took some good lube and a quick short whack with a hammer to free it up. I believe I took the handle off prior to tapping it with the hammer Now I religiously lubricate those cables and they work nice and smooth.
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Old 08-12-2022, 07:41 PM   #12
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I had the same problem and applied oil to the cables several times and they freed up. Now every month or so I pull handles all the way out and apply oil on the shaft and work it in and out several times that will prevent from happening again.
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Old 08-13-2022, 09:50 AM   #13
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.......... I am trying to empty tanks and the gray and black pull handles in the convenience center will not pull out........ I know they are cables to the real knife blade valves. Any suggestions on how to free them? I guessing I have to remove the bottom cover to get at them?..........
Ouch.......same issue with my black tank valve on my 2020 Montana fifth wheel trailer. Took a lot of tugging to eventually open it. Hopefully you will be able to free up valve and dump the tanks. After this occured several times on my trailer I replaced it with a new Valterra Flexible Cable Kit with 3" Valve (TC372 model for my trailer). Yes, you will need to remove the bottom cover.
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Old 08-14-2022, 02:49 PM   #14
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Black tank cable lube type

While you more experienced RVers are talking about black and gray handle lubricants, it raises the question; what type or brand of lubricant works best?
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Old 08-14-2022, 04:32 PM   #15
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There are many lubricants like WD-40, Kroll, LPS-2 (aviation lubricant) but the best formula out there is 50% transmission fluid and 50% Diesel fuel. Many studies have been made and this comes out on top by far.
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Old 08-14-2022, 04:38 PM   #16
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Originally Posted by NCFischers View Post
Unscrew the handle, take a 1/2 inch piece of clear tubing and slide it over the shaft and secure it with a hose clamp. Pour about 6 inches of oil (whatever is available) in the tube and let it sit overnight. Mark the oil level on the tubing with a magic marker. Mine has worked for two years after I did this.
Great tip! The handle for our kitchen gray water tank is hard to pull. Itís located behind the wheels and I was told it gets hard to pull because of debris that gets kicked up by the wheels. I lubricate occasionally but doubt the lube penetrates very far down the cable. Your tip sounds like a great solution. Thanks very much.
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Old 08-16-2022, 06:35 AM   #17
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Late to the game I know, but you might try a real penetrating oil to get that loose before resorting to more extreme measures. I've had great luck with Deep Creep. You should be able to find it at most auto parts stores.
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