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ssimonto · 08-08-2022, 03:13 PM

I have a 2018 Newmar King Aire on a Spartan Chassis with the Hadley Self-Leveling System. I've used the SLS (Self-Leveling System) feature many times in the past and it has worked fine until recently. When I set the system to Self-level everything works as designed except when the auxiliary pump comes on after the system air leaks off a bit, the pump then runs for 6 minutes straight without shutting off. It will not keep the chassis level after the initial set. The pump will repeat the 6 minute run time every hour or so. Previously, when the system was working correctly, when the aux pump engaged it would run briefly, maybe 30 seconds or so to re-level the coach then kick off. Can you help me figure out what's wrong?

Additionally, I'm trying to locate the auxiliary pump but I can't see it. I know it's located around the driver's side front wheel. Also, on my coach I have a switch in the chassis battery compartment which says: "aux pump". This switch is used to activate a pump and supply air to my rear hood air cylinders and provide access to the engine compartment. I think (but I'm not sure) this air compressor is the same one which supplies aux air to my SLS system. If so, I can confirm the air compressor is still working as it works on the rear hood air cylinders.

flyboy013 · 08-08-2022, 04:47 PM

It’s a Viair compressor. It may be best to access from the front. Extend the generator slide and then have a seat on the ground looking behind the tire area. You’ll see it. It’s connected to the Hadley system. The leveling system is designed to add air every two hours. Perhaps you have a loose air line coming out of the pump.

tom chelbana · 08-08-2022, 07:34 PM

We have found on our 18 LA with Hadley Air Leveling if you have a number of air leaks the system works for 6 to 12 hours and then it shuts off. Need to get the coach so it stays air up for 4 or more days before air leveling can keep up with air loss and keep coach level.
Newmar Man

Bobby Dowdle · 08-08-2022, 11:24 PM

I agree. It sounds like you have an air leak on the system and you need to get it repaired. Is the coach leaning to one side after it sits with the self leveling selected?

ssimonto · 08-09-2022, 08:28 AM

Quote:

Originally Posted by Bobby Dowdle

I agree. It sounds like you have an air leak on the system and you need to get it repaired. Is the coach leaning to one side after it sits with the self leveling selected?

The SLS system will level the coach on the initial set but over time it will begin to lose its level. I'll begin searching for air leaks in the system.

I did replace the pressure regulator on the rear hood open-close valve as it was leaking. This didn't resolve the SLS aux pump issue.