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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 12-28-2009
al perna al perna is offline
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Default air dump valve

Could someone tell me if it is possible to get air to the dump valve without running the engine ? I have tried to run the small compresor but It would not move the gauge. Thanks for any help as always
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  #2  
Old 12-28-2009
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curtsprenger curtsprenger is offline
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Quote:
Originally Posted by al perna View Post
Could someone tell me if it is possible to get air to the dump valve without running the engine ? I have tried to run the small compresor but It would not move the gauge. Thanks for any help as always
Our '87 PT38 tank dump valves get air from the engine and the small compressor. Your gauge might be bad.
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Old 12-28-2009
bubblerboy64 bubblerboy64 is offline
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My small compressor doesn't seem to produce enough pressure to open those dump values. I often have to help the process along but pulling up on the handles. I suspect the dump valve is sticking some. How much pressure is the auxiliary compressor supposed to be able to produce and is there an adjustment to increase?
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Old 12-28-2009
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curtsprenger curtsprenger is offline
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Originally Posted by bubblerboy64 View Post
My small compressor doesn't seem to produce enough pressure to open those dump values. I often have to help the process along but pulling up on the handles. I suspect the dump valve is sticking some. How much pressure is the auxiliary compressor supposed to be able to produce and is there an adjustment to increase?
Agree, paddles could be sticking. Might need to change them before the seals stop holding back the tank contents. Our dump valves have the 35 psi regulators at the valves; photos attached.
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  #5  
Old 12-28-2009
Stephen Stephen is offline
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Any where up to 50 lbs. psi
there should be an adjustable regulator in the vicinity of the valve
they show on Curt's pictures
When did you last service the valves
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  #6  
Old 12-28-2009
al perna al perna is offline
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Quote:
Originally Posted by curtsprenger View Post
Our '87 PT38 tank dump valves get air from the engine and the small compressor. Your gauge might be bad.
Im sure the gauge works. When Im running the compressor I notice the air chuck will get hot to the touch. Not sure why Has anyone ever redirected the air line for tank fill up and use for toys only?
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  #7  
Old 12-28-2009
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My 12 volt air compressor only works the toilet and my slide air seal. The 12 volt compressor will not pump up the aux. air in order to work the dump valves.

My 110 volt air compressor will air up the aux air system as well as everything else.

If you have an air toilet and only 1 compressor, then can not air it up.
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Old 12-28-2009
al perna al perna is offline
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Quote:
Originally Posted by yesmar View Post
My 12 volt air compressor only works the toilet and my slide air seal. The 12 volt compressor will not pump up the aux. air in order to work the dump valves.

My 110 volt air compressor will air up the aux air system as well as everything else.

If you have an air toilet and only 1 compressor, then can not air it up.
So if i dont want to start the bus,I use a 110v seperate compressor . i connect to the valve next to the existing compressor ?
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  #9  
Old 12-28-2009
fxdwg fxdwg is offline
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Al,

Just to clarify, you've only got a 12V small compressor on your bus (besides the engine driven one). If that's the case, then a separate 110V (or large volume 12V) comnpressor is needed to prevent having to start the engine. You will have to hook it to the schrader valve probably at the rear of the bus. Mine is just to the right of the engine on a bracket off the chassis. It's quite noticeable on mine. Hooking to the air chuck in the bay probably will not allow you to air up the system, as I think there is a one way valve to prevent air inflow into the system.
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Old 12-28-2009
rrueckwald rrueckwald is offline
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If the 93 is anything like the 95, there is a fitting with a plug in it where the compressor connects in the bay ahead of the water panel. That's where the factory put the 110 vac compressor, complete with wiring. The PO, decided to take the compressor out prior to selling it, so I, (complete dummy) missed it and had to reinstall one later. Fortunately all I had to do was install the compressor and a pressure switch, using the existing wiring lurking in a nearby electrical box. You may have the same provisions.
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