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Old 07-15-2020, 08:12 PM   #21
Ml barber
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Didn't mean to post twice. Didn't know if 1st went . 1st time posting.
 
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Old 07-15-2020, 08:34 PM   #22
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The cable pull valves are an inherently poor application. It's like keeping a Ford 6.0 on the road. I know a guy who does but at great cost and effort. There is more than enough to maintain on an rv without having to adhere to an unnecessary maintenance schedule for waste tanks. Just my $.02.
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Old 07-16-2020, 06:52 AM   #23
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Cables

Hi, I don't know much on camper cables but, I owned enough motorcycles to tell you that they make cable lubricators, that you can pump grease into cables. they clamp right on to cable and you use a grease gun to fill cable with grease. I didn't ride much in cold temps. but, I used high temp. wheel bearing grease in all mine, worked good for me. Just a thought, my 3000rk has rods and I used 3/8 fuel line and cut it down one side of hose and slid it down rods and I pour small amounts of cooking oil in the top of the hose and work it back and forth to lube valve. I also have the clean out option on black water tank that I run constantly, while dumping tank, then leave it running after I close valve, then I have wife flush toilet while I open valve to do final dump. This has worked good for us so far. Good luck to you and Happy Camping..
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Old 07-18-2020, 08:13 AM   #24
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To open the stuck valve, I used a slide hammer. Once open, lubricated .
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Old 07-14-2021, 01:25 PM   #25
Camp CA
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I have owned 3 fifth wheel trailers over 17 years without a blank or grey tank dump valve/cable failure. My 3rd trailer, a 2020 Montana 3780RL, began to have blank tank dump valve opening issues starting 6 months after I purchased her. Fortunately I had the foresight to installed a Camco 3-inch Sewer Gate Valve with cap Built-in Clear Adapter 3-inch Sewer Fittings | Ready to Use Construction (39053) immediately after I purchased her since the black tank dump valve would not close after 17 months. I Just got it replaced at a local RV repair shop this month. What a relief!!
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Old 07-14-2021, 04:33 PM   #26
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The stock valves are a braided cable inside the sheath. Any moisture will form a sticking point. We were proactive on our last unit and installed the Valterra valves. It is a nasty job. When we bought our new unit, I had them replaced before we ever used the bathroom or drains. At the same time, as long as the coroplast was dropped, we had SeaLevel Gages installed. Both can be done at home to save money (which we did the first time).
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