air pump cycles to often

[Carl & Shelly]

Our 09 Dynasty has a air pump that will fill the air bags when sitting and the air pressure in the air tanks gets low...Yesterday it has started to cycle every 5 minutes or so, comes on for about a second or two...Anyone have an idea where to start?
Thanks Carl

[caymann]

So you have a leak?
Only way to do it: - Soapy water and get dirty under the coach

[Volunteer]

I'm sure others will chime in but the first thing I would do is replace the air governor. It's an inexpensive item and easy to replace yourself. On my Freightliner with a Cummins, it's located between the air dryer and the air pump and sort of looks like a brake cylinder on the old shoe brakes.

And if you are a "do-it-yourself" person, I would recommend getting one from a dealer for your chassis. I've had a couple of dogs I picked up at big truck parts stores. But maybe that's just me.....

[caymann]

Quote:

Originally Posted by Volunteer I'm sure others will chime in but the first thing I would do is replace the air governor. It's an inexpensive item and easy to replace yourself. On my Freightliner with a Cummins, it's located between the air dryer and the air pump and sort of looks like a brake cylinder on the old shoe brakes. .

I may be wrong but I believe he is talking about the 12V auxiliary pump/compresor used for air leveling since he says this happens when sitting (not engine running). This 12V compressor is not connected to the engine air governor. It has a pressure switch which does the cut in/out at 105/120psi. He has a leak somewhere.

Basically air up the coach and be safe underneath w/proper jacks. Get soapy water in a bottle and start spraying to see where the leak is.

[Carl & Shelly]

Good advise, will try that first, and yes I am talking about the 12 volt pump...Thanks

[EngineerMike]

Carl- if its an air leak, a second or two of pumping seems suspect to me to cure an air deficiency. Don't rule out a defective pressure switch on the 12V pump setup.

[Carl & Shelly]

It does't seem to be an air leak...I fired up the engine and filled the front and rear air tanks to 129 psi, shut the coach off, and after a few minutes the 12 volt air pump came on again, but just for a moment, still had 129 psi in both tanks, I slid the generator out to gain access to the 12 volt pump and now it won't act up....so I am waiting for it to cycle again before I can continue.
Thanks Carl