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Old 08-04-2013, 08:57 PM   #1
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Air Bag PSI Question- 1977 Bus Conversion

Hello,

I have a 1977 AM General Transit Bus (35 feet long, Detroit Diesel 8V71T, Allison transmission) that underwent an RV conversion about 20 years ago. I bought it a little over a year ago and was told by the salesman (who personally knew the man who did the conversion) that the air pressure for the bellows should be between 55 and 62 PSI. The bus rides pretty low, so I recently looked at the original manual to find out what it specifies. It mentioned that max PSI for the bags is 120. I've been running them at 62 this whole time. Does that seem correct? The current airbags may not be the original ones, so is there a way to definitively find out what the optimal PSI is?

Thanks!
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Old 08-04-2013, 10:36 PM   #2
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i would post here as well they have a full Bus Conversion side

The RV Forum Community - Index

i got alot of help form there
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Old 08-05-2013, 09:35 AM   #3
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Sounds like your bus has been customized to include air leveling, where a slightly higher pressure just may be used.

However, the pressure necessary to achieve the correct RIDE HEIGHT, on level ground is what you should be running while traveling. Look up the correct ride height, set the pressure to achieve that, and that is what you should set if moving.

And yes, pressure to the bags is around 60 psi when level, and that is obtained with the original automatic levelers.

Ed
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Old 08-05-2013, 10:49 AM   #4
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Quote:
Originally Posted by Ed-Sommers View Post
Sounds like your bus has been customized to include air leveling, where a slightly higher pressure just may be used.

However, the pressure necessary to achieve the correct RIDE HEIGHT, on level ground is what you should be running while traveling. Look up the correct ride height, set the pressure to achieve that, and that is what you should set if moving.

And yes, pressure to the bags is around 60 psi when level, and that is obtained with the original automatic levelers.

Ed
Thanks for the info. My bus doesn't actually have automatic levelers. I have to manually adjust the PSI from the cockpit. I will check the ride height in the owner's manual and measure that. I just viewed a couple of YouTube videos of AM General buses out and about, and their clearances are pretty low. It may very well turn out that my current settings are what they're supposed to be, and that I'll have to get used to scraping the rear every time I exit a parking lot with a steep-ish incline.
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Old 08-06-2013, 09:57 AM   #5
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What I was saying was that your bus originally had automatic levelers because of the shifting loads due to passenger traffic, but was converted to manual operation in order to serve the purpose of leveling using the existing air system vice a hydraulic/manual system.

Others that have done this know exactly how much pressure is required to provide correct ride height for the load weather tanks are full or empty, ect. And normally, even if leveling the coach while stopped they have a PSI limit of somewhere around 80 psi else problems may show themselves. A difference of 80 PSI at one end, and zero at the other provides quite a range for leveling when sitting still.

Ed
1967 MCI5A
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