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Old 08-16-2016, 06:37 PM   #15
shovelhead86's Avatar
Join Date: Dec 2015
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Originally Posted by dayle1 View Post
Black is always 3 inch and gray is always 1.5 inch. Chances are the cable is not the problem but the valve itself is clogged with debris. Stuff does stick to the blade and it can also build up inside the cavity that the blade opens into. If you disassemble the valve, clean it, lube it and reassemble it then it will work better. Then in the future, flush the tanks very well, add dish soap as a lubricant. If you don't want to tackle the messy job, then use a mixture of mineral oil and water. 1/2 gal oil and 2 gal water, with the valve closed let it sit for a few hrs then dump it into a bucket and repeat several times. Then repeat with the black valve.
Sorry to disagree but both my black and gray tanks are 3". My Galley tank is 1 1/2". I have a Montana per

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Old 08-16-2016, 10:26 PM   #16
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Location: Idaho Falls, ID, USA
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Here is my system for lubricating both sides of the blades and the groove of both of my drain valves including the toilet flush valve. Been doing this for 19 years, still have the original valves.

First drain and flush both tanks to flush out all solid matter. Close both dump valves.

I have a 3 inch termination cap that has a garden hose bib, attach a small plastic garden hose ball valve to the hose bib to act as a control valve, install the cap on the end of the RV drain pipe with the hose bib/control valve at the lowest position. Shut the control valve. Attach short piece of drain hose/bucket if desired. I just let it drain onto the gravel next to my RV concrete parking slab.

Put about 5-8 gal of water in each tank (just make sure that you have more than 3 inches in the black tank and more than 1 1/2 inches in the grey tank). Put about 1/2 pint of mineral oil in each tank. (about $2.50/pt at Wally World) When you put it down the toilet and opening the flush valve slowly it will lubricate the toilet flush valve blade, when you put it down a sink/shower drain with a "P" trap use a lot of water to flush it out of the "P trap.

Open the black tank drain valve about 1/2 way. This will fill the cavity between the drain valve and the termination cap. Open the control valve a small amount, you want a stream of water smaller than pencil diameter. Remember that the oil will float on the top of the water. As the water slowly drains out occasionally cycle the drain valve open/close, leave the drain valve about 1/2 open until the next time to cycle it. As the oil level interface goes down this will ensure that both sides of the blade and the groove are coated with oil. I have been always been able to feel the ease at wich the valve operates when the oil is coating the blade.

Repeat doing the gray tank drain valve.

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Old 08-18-2016, 03:20 PM   #17
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Thanks Richard....from the description of the process it sounds like that could really work with running it back thru enough times!

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