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Old 02-18-2013, 12:37 PM   #15
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Originally Posted by CampDaven View Post
Is this about knife valves on cables or just the short solid shaft?
Rig 1 had cables, and I pulled them apart and vasalined the bajeebers out of them.
Rigs 2 and 3 have the solid shafts. No troubled.
The underside of the trailer is completely enclosed. It has, I believe, 3 ABS pipes coming out underneath with each having a valve. These valves have handles and a shaft that goes into each individual pipe where, I think they have gate valves. The handle on my black tank is really hard to pull out and push in. Can I lube the shaft without harming the valve and the plastic pipes?

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Old 02-18-2013, 12:46 PM   #16
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Use silicone spray to loosen them up, then apply plumber's silicone faucet grease for more long term function. PB Blaster would be useful for cable pull loosening, as it has the ability to lube and 'crawl' along the cable. PB Blaster in that application would probably not transfer to the valve shaft and harm the O ring or plastic.


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Old 02-18-2013, 08:35 PM   #17
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ezspdr, These are "blade" valves, a sliding flat plastic blade sealed with "rubber" sealing rings. These valves may be rebuilt by completely emptying the tank, removing the bolts that hold the valve together, sliding the center portion out, replacing the sealing rings and blade (both are bought in a kit) ( now is a great time to lube everything with plumbers grease, bolting it back together.
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Old 02-19-2013, 06:30 AM   #18
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Here is a really good video I found that will help you in understanding how it works and how to do maintenance.

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Old 02-19-2013, 11:16 PM   #19
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Sticky Valve pulls

Originally Posted by Caveman CBB View Post
Here is a really good video I found that will help you in understanding how it works and how to do maintenance.

Thanks Caveman that video really helps. I appreciate it.

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