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Old 08-25-2014, 09:13 PM   #1
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Well I did it now...

Ever since our 36ckts was new , I allways had a very stiff black tank dump valve slide. i have tried every valve lube sold I think I could find and a few different types of food grade oils with only marginal success , only to get really stiff again to the point where I thought something was going to break , either pulling it out or forceing it back in. So this weekend I decided to drop the underbelly and remove the center section of the valve for cleaning and inspection , it all didn't look that bad and after a cleaning and a liberal dose of plumbers gease it all went back together well . Now it slides as smooth as butter. Now the fear of the worst happening at the worst time is over. It's a easy fix for anyone exerienceing the same thing.

Rich
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Old 08-25-2014, 11:18 PM   #2
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Was there any thing actually wrong with it? Any foreign materials stuck in it?
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Old 08-26-2014, 03:41 AM   #3
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How difficult was it to drop the underbelly?
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Old 08-26-2014, 11:07 AM   #4
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Quote:
Originally Posted by rich and char View Post
Ever since our 36ckts was new , I allways had a very stiff black tank dump valve slide. i have tried every valve lube sold I think I could find and a few different types of food grade oils with only marginal success , only to get really stiff again to the point where I thought something was going to break , either pulling it out or forceing it back in. So this weekend I decided to drop the underbelly and remove the center section of the valve for cleaning and inspection , it all didn't look that bad and after a cleaning and a liberal dose of plumbers gease it all went back together well . Now it slides as smooth as butter. Now the fear of the worst happening at the worst time is over. It's a easy fix for anyone exerienceing the same thing.

Rich
Yes, mine is difficult to open and close. I was thinking it was because the cable is too long to the valve. Did you change the routing or length of the pull cable?
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Old 08-26-2014, 05:29 PM   #5
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No nothing stuck in it, it actually looked pretty clean ,
Dropping the bottom wasn't that bad some screws to take out , but the gas line is in the way a little bit ,had to lower it a touch to slide out the panel and then move the insulation to see and get to everything.
Cable routing was good , no pinching or binding or tight turns. Didn't alter the length, would not recommend it.
It worked easy when removed to be cleaned. I also thought it was assembled to tight sweezing on the slide , but nope.
I just greased it up good and reinstalled , what a difference it made. Probally minimal lube from factory.
IF it ever gets tough to operate again , I'll spend the hour or two to do it again.
Just make sure your tank is empty...
also sprayed some wd40 into both ends of the cable jacket and on slide rod .
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Old 08-26-2014, 05:56 PM   #6
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Old 08-26-2014, 06:27 PM   #7
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I just replaced my valve after the cable broke (valve open, fortunately). The valve was hard to operate since new. Same thing - once it was out I couldn't find anything wrong with it. I ended up having to cut the pipe to separate the valve halves and repair it with a Fernco coupler. Not a bad job. Really glad the tank was empty!
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Old 08-28-2014, 08:54 PM   #8
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MY 29RE has the same problem...very stiff...to open and close.....Did you put some greese of some kind on the rubber seal????/ Someone said to drain well and leave valve open for a few days...then close and pour some cooking oil down toilet and leave a few more days....J
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Old 08-28-2014, 10:01 PM   #9
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Hi there. Great write-up. Which panel was the right one to remove, or did you end up taking most of them off? Mine are very stiff too, so I'd like to get in there. I read in a few spots that people are putting grease zerks in the valve with great success.

Thanks
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Old 08-29-2014, 05:10 PM   #10
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I too have the same problem with my black tank valve on our 28RE. Both grey tanks operate very smoothly but the black valve is so tight I'm afraid I'll break something every time I pull it open or push it closed.

I reached behind the panel (where the handles are) and pulled some of the slack up in the black cable...thinking it might be binding somewhere. That helped enough that I think I can wait a little while now before doing what the OP did.
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