[HoosierDaddy]

316 has a 12V compressor just ahead of rear passenger side tire in a spot just inside the inner aluminum "wall" accessed from the bay door. I have an air toilet and air step cover. My 12V compressor will not put out enough air to work the toilet properly. I'm wondering if there is a check valve someplace that is not working. It's on my "todo" list. I'm getting by using the 115V compressor and the engine compressor.

[Fulltiming]

There is likely a pressure regulator on or near the 12 volt air compressor.

I appreciate the information on 316 having an air toilet. I wasn't sure when they started putting air toilets in but we know it was at least by 1993.

[jcus]

316 has a 12V compressor just ahead of rear passenger side tire in a spot just inside the inner aluminum "wall" accessed from the bay door. I have an air toilet and air step cover. My 12V compressor will not put out enough air to work the toilet properly. I'm wondering if there is a check valve someplace that is not working. It's on my "todo" list. I'm getting by using the 115V compressor and the engine compressor.

Had the same problem, found 12 volt compressor was set at 30 psi, not enough for toilet and air door.
Set it up to 60 psi and all works good.
Jim

[Richard]

At the risk of another goof on my part on this thread, on the Newell setups I have had my hands on, there is both a well pump pressure switch with high and low setpoints, a regulator, and a check valve to keep the 12V from pressuring the entire air system.

If the pressure is low, it could be a simple adjustment on the regulator. Or it could be the setpoints on the on off well pump switch need adjustment.

[jcus]

At the risk of another goof on my part on this thread, on the Newell setups I have had my hands on, there is both a well pump pressure switch with high and low setpoints, a regulator, and a check valve to keep the 12V from pressuring the entire air system.

If the pressure is low, it could be a simple adjustment on the regulator. Or it could be the setpoints on the on off well pump switch need adjustment.

I might have messed up, but my air door only worked off eng or ac compressor system. Found a blanked off air line in compartment behind 12 v compressor. So 'teed" it into 12 volt comp discharge and adjusted it  to 60 psi. Whole system stays around 60 psi now, even with no ac air compressor. Do not know if there are any check valves to prevent main system from dumping into toilet, air door, or door slide system in case of leak there, but brake side stays at 120, so know there is a check valve working there.

[Richard]

You didn't mess up, the regulator you adjusted is downstream of the input from the big compressor/aux compressor. It is there just to regulate the pressure to the air toilet. It just so happens the doors are also on that circuit.

The toilet does not like air pressures much above 60. It jams the sequencing valve.

[bikestuff]

My air doors don't like more than 40 but my toilet needs right around 60 to work well. I used to have to futz with the regulator to make them both happy. Finally, I put two regulators in. One for the doors and the other for the toilet. All are happy now.

[folivier]

Best solution Bill. Good job.

[Richard]

Right, I understand about the doors. The actuators for the doors should have adjustable mufflers on the outlets to the solenoid valves to adjust speed of opening and closing. However, those actuators are often buried deep inside hidden compartments, so adding a second regulator to the door circuit was a great idea and much easier to implement.

[RegaNewell]

I also found this switch to be leaking. This is why I had to drop and remove the hydraulic fluid heat exchanger to get to it.  This is where I ordered it from, cost was $45.36.
Part# 228750
AnythingTruck.com, Truck & Trailer Parts and Accessories Warehouse
2350 4th Ave, Moline, IL 61265
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Phone: 309-623-4440