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Old 10-06-2015, 10:11 PM   #1
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Air pressure question

Does anyone know what the air pressure is in the auxiliary air outlet in the generator compartment? I was thinking about buying and air hose and chuck to use it for pumping tires and blowing the water lines for winterizing.

Any thought or advice?

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Alex and Valerie
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Old 10-06-2015, 10:35 PM   #2
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Just look at your dash air gauges. I think you'll find it varies from 80 to about 120. Since the pressure vary so much, it takes special air chucks and procedures to air the tires up. Probably be too much pressure to blow the water lines out.
I just bought this chuck a couple months ago and it works great for the tires.
http://www.amazon.com/Milton-S693-Du.../dp/B000COS0PG
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Old 10-07-2015, 12:15 AM   #3
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I guess I have to shell out for a compressor then.

Thanks Dan
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Old 10-07-2015, 04:53 AM   #4
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I use mine to air up the tires on the MH. and does great. I also air up the tires on my pick up.
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Old 10-07-2015, 07:37 AM   #5
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I guess I have to shell out for a compressor then.

Thanks Dan

VIAIR makes a great compressor kit that runs off of 12 volt. A little pricey but worth it IMHO.


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Old 10-07-2015, 08:15 AM   #6
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Max air pressure should build to 120 to130 psi and you should hear a 'Chuff' when the air dryer vents. There should be 25psi difference between max air pressure and when the air compressor kicks back in. This is controlled by the air governor.


You can use any type of air hose and fittings you like off of the auxiliary air outlet to air up tires, run air tools etc. with the engine running and producing air.


This would be a good time to familiarize yourself with the air brake system on your coach. Air Brakes Endorsement Exam - CDL TEST ANSWERS AND STUDY GUIDE FOR COMMERCIAL DRIVERS LICENSE EXAM
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Old 10-07-2015, 08:26 AM   #7
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You can use any type of air hose and fittings you like off of the auxiliary air outlet to air up tires, run air tools etc. with the engine running and producing air.
X2 on using any air hose and accessories because not matter what type of compressor mounted on a MH or truck or electric all compressors cycle from max pressure to a set low pressure before the compressor engages. I would recommend a regulator for blowing out the water lines.
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Old 10-07-2015, 08:55 AM   #8
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Picked up an air regulator at harbor fright that I put inline when blowing out the water lines, adjust it down to around 40 psi. Lots cheeper than buying a air compressor.
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Old 10-07-2015, 09:02 AM   #9
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Alex
Shown below are some of home projects that made using the motorhome's air more convenient. To store my hose, I moved the air horn out of the way. Since all air compressors cycle from a high limit to a low limit, you generally want to use the highest pressure available for filling tires. One of the pictures shows an air dump valve, to enable the compressor to kick on and pump back up. Another is a regulator for blowing out the water lines, so that you can set the pressure like at 40 psi. A lot of parts I got from Harbor Freight.
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Old 10-07-2015, 09:04 AM   #10
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The air compressor on the big Berkshires are direct gear driven off the engines accessory drive. I don't know if you can set up an elevated idle in park on those though like you can with the trucks. With the air suspension there should also be a larger capacity air reservoir also making for plenty available accessory air volume.
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Old 10-07-2015, 09:08 AM   #11
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Yes you can set high idle. Using the cruise control.



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Old 10-07-2015, 09:09 AM   #12
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There is an elevated idle option. With engine idling in neutral, turn on the cruise control and push the button on the end of the directional stick and the engine speed will increase.
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Old 10-07-2015, 08:48 PM   #13
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Thank you very much for all your response. Hank I really like your setup
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