Using coach compressed air for tire inflation

[cc8375]

Originally Posted by VP Chianese

Get it weighed. You will find that your steer pressures will be closer to 110-115 and your rears will be 85-90.

That being said the coach will supply about 120 but you will have sore arms from holding the hose on the valve for the time it will take to get to 115 lbs. in one tire let alone two.

Stop by a truck tire store or even a Cummins dealer and ask nicely. $20 tip and you can get everything right where you want it.

But weight the coach so you know what you have and use the Michelin tire pressure chart. 130 is the max for the max load and you aren't there. That is 9K plus on each steer which would be 18k for the front axle and you are probably under 8k per side. Use the highest number across the axle. So if one side is 8k and the other is 7.5k you would use the 8k number and thus 115-120 psi on both steer wheels.

The rears will be close to 8-9k per side on the dual. So if you share that between the two tires you are under the min weight and pressure on the chart. So the min recommended psi on that tire is 80 psi so 90 would be good and a little better fuel mileage.

Tags are going to be around 3.5k per side. 80 -90 psi.

These are the numbers for my coach a 2015 4369 so you should be close. Also if you call customer service at Newmar and give them your serial number they can give you the weights on each wheel the day it left the plant with full fuel.

Good luck.

Yes...... get it weigh and then determine tire pressure.
Tire Pressure Monitoring & Adjustments by Freightliner - Newmar

[MikeGriffin]

If it helps, I have a short write-up about the one we chose (the Viair).

[VP Chianese]

Originally Posted by Tony Lee

What happened to "FREE AIR"

The air was free and they asked for nothing. The $20 bucks was for setting the pressure on eight wheels and me not having to do it on a 90* day.

[Romeo]

Originally Posted by VP Chianese

The air was free and they asked for nothing. The $20 bucks was for setting the pressure on eight wheels and me not having to do it on a 90* day.

Well, that was nice of you to tip, but I think we as a society are getting too concerned with paying for courtesy and helpful service... I use "Thank you, I appreciate your help" and don't accept anything more when I help someone.

However, to the point of discussion, I use Les Schwab twice a year to set my air pressure, and any other truck service that is around. None ever expect any re-numeration for air service. In appreciation I use their business whenever I can.

I also think that 130 psi sounds too high. I use 100 psi in the steer Michelin XZA3's and 95 psi in the rear duals.