Community Forums

Rvhurley · 10-26-2019, 09:49 AM

I have a 2017 MountainAire. It has an air supply coupling on or next to my 500hp Cummins engine. Can I hook up an air hose to this coupling and use it to put air in my tires? If yes, is there enough pressure to inflate a tire that uses 125lbs?

PandS · 10-26-2019, 10:03 AM

Quote:

Originally Posted by Rvhurley

I have a 2017 MountainAire. It has an air supply coupling on or next to my 500hp Cummins engine. Can I hook up an air hose to this coupling and use it to put air in my tires? If yes, is there enough pressure to inflate a tire that uses 125lbs?

You will need to have someone in the coach pumping the brakes. So yes, but it is not convenient and will take a while. A better option is a portable unit capable of 150 PSI. -Paul

Bigd9 · 10-26-2019, 10:11 AM

Are you sure you need 125 psi in the tires?

As pandS indicated it can be done, but you need to pressurize the system every so often by dropping the tank pressure low enough to trigger the engine to pressurize the tanks back to 125+-

TJ · 10-26-2019, 01:30 PM

The short answer is...yes, and no! Yes, you can hook up a hose to the coach air fitting. No, it probably won't provide enough pressure to air up 125 psi tires...at least, conveniently.

The drawback is that (a) the engine needs to be running and (b) the on-board compressor usually tops out at 125 psi, so it will be an extremely slow process to air a tire up to that pressure.

Most of us carry a portable 150 psi compressor that runs off 120VAC or 12VDC. A forum search will find lots of threads discussing the preferred brands and models.

TJ

tom chelbana · 10-26-2019, 05:01 PM

On our 18 London Aire with Hadley Air Ride which should be the same for your MA the air pressure is 145 psi for both tanks. Our tire pressure tool for putting air in tires has a gauge to tell what the line pressure is so you know if you have the max which is 145. Why have a air electric air pump if you don't need it? We again have no problem using the coach air to fill our front tires to their cold setting of 115 psi with the rest only needing 90 psi.
Newmar Man

lakebuster · 10-27-2019, 09:00 PM

Quote:

Originally Posted by tom chelbana

On our 18 London Aire with Hadley Air Ride which should be the same for your MA the air pressure is 145 psi for both tanks. Our tire pressure tool for putting air in tires has a gauge to tell what the line pressure is so you know if you have the max which is 145. Why have a air electric air pump if you don't need it? We again have no problem using the coach air to fill our front tires to their cold setting of 115 psi with the rest only needing 90 psi.
Newmar Man

Tom we also have a London air with the Hadley. Do you know what type of air pressure the 12V auxiliary air pump puts out?

DebnDan · 10-27-2019, 10:05 PM

https://youtu.be/QDOqCk6dTuo

Mr_D · 10-27-2019, 10:29 PM

My front tires take 125 psi. I really hate to run my ISX 650 just to air tires up so I bough a Viair 450 RV pump. Much quieter too.

Flanz · 10-28-2019, 05:03 PM

This comes up a lot. There’s a thread going on right now on the Entegra newsgroup. Must be at least the 4th or 5th time this year. Never ends.

Everyone has a solution and obviously there’s is the best. Below is my solution that works for me, both cost wise and functionally.

http://www.irv2.com/forums/f278/airi...er-463602.html

You’ll find some solutions that are 100’s of dollars all the way down to a couple bucks. But you need to remember that if you need 100+ lbs of air your going to need a decent compressor.

jrs · 11-02-2019, 10:57 AM

Quote:

Originally Posted by Flanz

This comes up a lot. There’s a thread going on right now on the Entegra newsgroup. Must be at least the 4th or 5th time this year. Never ends.

Everyone has a solution and obviously there’s is the best. Below is my solution that works for me, both cost wise and functionally.

http://www.irv2.com/forums/f278/airi...er-463602.html

You’ll find some solutions that are 100’s of dollars all the way down to a couple bucks. But you need to remember that if you need 100+ lbs of air your going to need a decent compressor.

We went with the Porter Cable model posted above. It's not very heavy and easy to carry where needed.

conniechin · 11-03-2019, 08:25 AM

In our MA with 51K load, tire recommendation is 115 psi on the front tires. Yes you can pressure the tires off the engines. You will need to run the engines, do not pump your brakes (this will deplete the tank) but may need to rev the engine by using the cruise control to increase the rpms.

I have chosen instead to purchase a external compressor to keep the tire at the correct pressure. This is what I purchased VIAIR 45053 Silver Automatic Portable Compressor Kit (450P-RV) and it has been working great. It does take several minutes per tire depending on starting pressure and desired pressure.

https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1.