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General Discussion of preventative/corrective maintenance and other technical issues regarding your coach that are not covered in other Mechanic's Corner categories (ex. refrigerators, water heaters, and compressors).

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  #1  
Old 08-04-2016
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Default dump valve air supply

I was thinking about one of those cheap 12 volt tire filling compressors for operating the dump valves. I hate to have to wait till I start the bus to dump. Sometimes I want to dump the night before or whatever. I doubt they have enough CFM to properly work the valves without some sort of small air tank, but maybe?

Has anyone tried something like this?
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Old 08-04-2016
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Quote:
Originally Posted by gcyeaw View Post
I was thinking about one of those cheap 12 volt tire filling compressors for operating the dump valves. I hate to have to wait till I start the bus to dump. Sometimes I want to dump the night before or whatever. I doubt they have enough CFM to properly work the valves without some sort of small air tank, but maybe?

Has anyone tried something like this?
I agree you will need a storage tank of some sort - I don't thing those small compressors have enough oomph - - - - only saying this because 2 of them will not even operate my air horns on the Zimmer I do have a small air tank that I will be installing sooner or later
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Old 08-04-2016
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I agree you will need a storage tank of some sort - I don't thing those small compressors have enough oomph - - - - only saying this because 2 of them will not even operate my air horns on the Zimmer I do have a small air tank that I will be installing sooner or later
I suspect without a good volume under decent pressure the valves will not close solidly. Those air cylinders open and close real solid with good wet tank pressure.
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Old 08-04-2016
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I suspect without a good volume under decent pressure the valves will not close solidly. Those air cylinders open and close real solid with good wet tank pressure.
Good observation Gardner
I always go around and check by hand that the valves are closed
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Old 08-04-2016
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Summit Racing has several small tanks (1/2 gallon and up). But I suppose I would need to think about moisture as there would be no air drier. I could feed it with a one-way valve from the coach air and use the cheap pump as needed. I suspect the 1/2 gallon tank would just about supply one valve without a recharge. In reality I could replace the valve on the street side with a manual one. I really don't want to walk around the bus 2 or three times to open and close the curb side one.
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Old 08-04-2016
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The dump valves require 60 psi max, so a small compressor with a small tank works. If you use a pancake compressor with its own tank, you can use a quick disconnect to plug it into the bus system, or into the dump system. If you use the existing Gast compressor, you need two valves with the new tank, one for the compressor and one to switch the pressure switch so it senses the correct tank.

On the '00 I did it differently. Rather than air up the whole bus, I moved the dump valves to the Microphor tank, since there is a slide and air toilet. It uses a 12vdc Thomas compressor for that limited system only if the Gast compressor is turned off. I even went further and used two valves as above, so I could use the Gast or the Thomas for the small system.

Lots of ways to do it, but the part I just learned last year from Steven is that the dump valves ought to have a 60 psi regulator.
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Old 08-04-2016
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heck if they are lubed up/and not installed 180 out-- to easy to open and close
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Old 08-04-2016
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Ron,there was 3 different design air cylinders for the dump valves.
If you have a black cylinder,or a gold cylinder,60psi will not open them.
The silver or gray cylinder will work fine with 60psi.
it has a bigger piston.
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Old 08-04-2016
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so we need a super short fat cylinder for the lx..

manual valves in a bad place for a bad back.
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Old 08-04-2016
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Quote:
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so we need a super short fat cylinder for the lx..

manual valves in a bad place for a bad back.
you need 3'' of stroke.
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